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  • Articles  (495)
  • Articles: DFG German National Licenses  (495)
  • 2005-2009  (495)
  • Architecture, Civil Engineering, Surveying  (376)
  • Sociology  (119)
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  • Articles  (495)
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  • 1
    Electronic Resource
    Electronic Resource
    An Argument against Arguments for Enhancement (2008)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Studies in ethics, law and technology 1.2008, 1, art12 
    Details
    ISSN: 1941-6008
    Source: Berkeley Electronic Press Academic Journals
    Topics: Sociology , Technology
    Notes: The treatment-enhancement distinction is difficult to make, and defenders of enhancement often base their case on that. Critics of enhancement, however, often have prototypical cases of enhancement-oriented interventions in mind, and the ethics of these can be evaluated on a case by case basis. Things like intelligence enhancement may have adverse effects on equality and utility. If the equality and utility effects of such enhancements were sufficiently severe, then restrictions would be called for. We need to think more about how to make tradeoffs between liberty, equality, and utility--and we need to know more about the extent to which each of these is at stake--before reaching conclusions about the ethics of, and appropriate social policy regarding, human enhancement.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/selt/vol1/iss1/art12
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  • 2
    Electronic Resource
    Electronic Resource
    Preserving Humanity - and Technology? A Response to de Grey (2008)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Studies in ethics, law and technology 1.2008, 1, art11 
    Details
    ISSN: 1941-6008
    Source: Berkeley Electronic Press Academic Journals
    Topics: Sociology , Technology
    Notes: Aubrey de Grey's enthusiasm may or may not be infectious, but it is certainly palpable. And it adds a dimension to the discussion the priority that should be given to life-extension/anti-ageing research of which he seems to be unaware. For on the cusp of developments in emerging technologies we find ourselves button-holed by enthusiasts whose ``transhumanist" visions importunately press upon us the most radical understanding of their implications. My suspicion is that the transhumanist mini-insurgency is partly responsible for the general failure of the policy establishment to summon up the courage and vision to address the implications of emerging technologies at all. The insurgents' effort at ``branding" these technologies as transhumanist (like that of the Raelian flying-saucer cult, a decade ago, to claim cloning as their own) does no favors to the technology. The irony is that de Grey and his fellow-visionaries, far from generating consensus enthusiasm for emerging technology applications, are making them too hot to handle.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/selt/vol1/iss1/art11
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic Enhancement and Procreative Autonomy (2008)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Studies in ethics, law and technology 1.2008, 1, art9 
    Details
    ISSN: 1941-6008
    Source: Berkeley Electronic Press Academic Journals
    Topics: Sociology , Technology
    Notes: Liberal eugenics according to one version is distinguished from authoritarian eugenics on the basis that the choice of enhancement is devolved to parents. The argument for liberal eugenics combines a commitment to the right of parents to autonomy - in reproductive decisions and in the upbringing of children - and a parity claim that there is no morally significant difference between ante-natal and post-natal alterations of a child. The article reviews the putative constraints on parental choice, and assesses some criticisms of the parity claim. It concludes that a liberal commitment to social justice is in tension with a liberal commitment to parental choice, but judges that the former commitment does not entail the authoritarian eugenics which is represented as the alternative to liberal eugenics.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/selt/vol1/iss1/art9
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  • 4
    Electronic Resource
    Electronic Resource
    In Support of Human Enhancement (2008)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Studies in ethics, law and technology 1.2008, 1, art10 
    Details
    ISSN: 1941-6008
    Source: Berkeley Electronic Press Academic Journals
    Topics: Sociology , Technology
    Notes: This short comment presents arguments in support of human enhancement.What is enhancement? Surely it is a procedure that improves our functioning: any intervention which increases our general capabilities for human flourishing. We exclude from consideration those procedures often termed ``enhancements" that are of dubious overall benefit (for example breast or penis augmentation, or the taking of anabolic steroids to increase muscle mass). Equally we are not talking of ``designer" modifications which are more akin to aesthetic or fashion preferences than to improvements: hair colour, eye colour, or physique. An enhancement (as we are using the term) is something of benefit to the individual.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/selt/vol1/iss1/art10
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  • 5
    Electronic Resource
    Electronic Resource
    Generous Funding for Interventive Aging Research Now? (2008)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Studies in ethics, law and technology 1.2008, 1, art13 
    Details
    ISSN: 1941-6008
    Source: Berkeley Electronic Press Academic Journals
    Topics: Sociology , Technology
    Notes: This article examines Aubrey de Grey's case for allocating substantial funding to interventive biogerontological research immediately. The conclusion is that the case is inconclusive and that scientific analyses of costs and probabilities would be needed to defend it properly.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/selt/vol1/iss1/art13
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  • 6
    Electronic Resource
    Electronic Resource
    Should We 'Cure' Aging? A Reply to de Grey (2007)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Studies in ethics, law and technology 1.2007, 1, art7 
    Details
    ISSN: 1941-6008
    Source: Berkeley Electronic Press Academic Journals
    Topics: Sociology , Technology
    Notes: This is a reply to the discussion piece Life Span Extension Research and Public Debate: Societal Considerations, Studies in Ethics, Law, and Technology by Audrey de Grey. Having read the article there seem to be four messages. The first being, that longevity/immortality research faces rejection, resistance and neglect from `classic anti-aging' researchers, policy makers, the funding system and the public. The second being that the `pro-aging' trance is illogical; the third being that not pushing for longevity and immortality research is immoral; and the fourth being that so far no valid reason for opposing longevity and immortality has been generated and that we will deal with potential problems if and when they appear. My message in this invited comment is 1) that de Grey is right with his first point; 2) that his second point is debatable and depends on certain assumptions; 3) that his third point is even on weaker feet and debatable (Morals and ethics are social and cultural constructions and depending on ones frame of reference something can be seen as moral and ethical or not. This is a whole different paper as to who decides which morals and ethics are right and wrong and can't be covered here.) and 4) that the longevity and immortality research exhibits the same discourse problems as the other new and emerging technology discourses, namely that its makes light of potential and real social risks that it tailors to a minority of the world and ignores the marginalized majority of the world.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/selt/vol1/iss1/art7
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  • 7
    Electronic Resource
    Electronic Resource
    Social Perspectives and Genetic Enhancement: Whose Perspective? Whose Choice? (2007)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Studies in ethics, law and technology 1.2007, 1, art3 
    Details
    ISSN: 1941-6008
    Source: Berkeley Electronic Press Academic Journals
    Topics: Sociology , Technology
    Notes: This paper's account of the core issues at stake in relation to genetic enhancement is presented as an alternative to mainstream liberal defenses of enhancement. The mainstream arguments are identified as being associated with reproductive autonomy, individual choice, and a `neutral', passive interpretation of technology. The alternative account is associated with the perspective of `woman' or child-bearer, with a fundamental concern for social justice, and an understanding of society in both a global and a contextual sense. This paper adopts a theoretical framework informed by feminist ethics, particularly a feminist ethic of care. The paper begins by outlining some of the key points of the care perspective, highlighting how this contrasts with a mainstream `justice' perspective, and illustrating how this is reflected in arguments relating to genetic enhancement. The paper then turns to a consideration of how a care perspective might be applied to questions of genetic enhancement, and how this may bring forward new issues. This includes in particular a consideration of IVF technologies and how applying understandings from research into this area brings forward usually unaddressed concerns in considering genetic enhancement. The final section of the paper covers some of the questions that there is space to ask once the narrow focus on individual rights is overcome.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/selt/vol1/iss1/art3
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  • 8
    Electronic Resource
    Electronic Resource
    Liberal Freedoms: Enhancement Is/nt Eugenics? (2007)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Studies in ethics, law and technology 1.2007, 1, art8 
    Details
    ISSN: 1941-6008
    Source: Berkeley Electronic Press Academic Journals
    Topics: Sociology , Technology
    Notes: Genomics and the technologies arising out of the science are often heralded as a means of securing cures for diseases which have proved resistant to the progress of medicine. These, generally hereditary diseases, with advances in genomic science are becoming more understood, but as of yet the possibilities of effective cures, whether through for example somatic or germ-line gene therapy, remain elusive. This has not stopped despite speculation and debate on potential future applications such as the use of genetic technologies in enhancing humans. Curative applications and enhancement applications are inextricably linked however both through the social contexts in which these technologies are to be deployed and the discourses which inform and frame the debates on their use. This article seeks to explore these links and in doing so aims to investigate some of the wider dimensions of the enhancement debate.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/selt/vol1/iss1/art8
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  • 9
    Electronic Resource
    Electronic Resource
    Life Span Extension Research and Public Debate: Societal Considerations (2007)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Studies in ethics, law and technology 1.2007, 1, art5 
    Details
    ISSN: 1941-6008
    Source: Berkeley Electronic Press Academic Journals
    Topics: Sociology , Technology
    Notes: The pace of a given strand of scientific research, whether purely curiosity-driven or motivated by a particular technological goal, is strongly influenced by public attitudes towards its value. In the case of research directed to the radical postponement of aging and the consequent extension of healthy and total lifespans, public opinion is entrenched in a "pro-aging trance" - a state of resolute irrationality. This arises from the entirely rational attitude to a grisly, inevitable and relatively far-off fate: putting it out of one's mind allows one to make the most of what time one has, free of preoccupation with one's demise, and it is immaterial how irrational the arguments that one uses to achieve this are, e.g. by persuading oneself that aging is not such a bad thing after all. As biotechnology increasingly nears the point where aging will no longer be inevitable, however, this studied fatalism has become a core part of the problem, making people reluctant to join the crusade to hasten that technology's arrival. An effective way to address this hesitation is to promote debate about the reasons people give for fearing the defeat of aging, most of which are sociological. Such debate exposes people to the glaring flaws in their own logic. Thus, the more the debate is sustained and promoted, the harder it is for those flaws to be ignored.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/selt/vol1/iss1/art5
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  • 10
    Electronic Resource
    Electronic Resource
    Medical Nanorobotics: Breaking the Trance of Futility in Life Extension Research (A Reply to de Grey) (2007)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Studies in ethics, law and technology 1.2007, 1, art6 
    Details
    ISSN: 1941-6008
    Source: Berkeley Electronic Press Academic Journals
    Topics: Sociology , Technology
    Notes: Biogerontologist Aubrey de Grey has suggested that one of the reasons we as a society invest so little in research on combating aging is because we are in an intellectual trance. We think the effort will be futile: aging is immutable, so why try? A healthy skepticism can be a good thing but it is a major mistake to bet against the irresistible force of inexorable technological progress. Over the next few decades, nanotechnology will come to play a pivotal role in the solution to the problem of human aging. Medical nanorobotics, if it can be made to work, can unquestionably offer convenient solutions to all known causes of age-related damage and most likely can also successfully address any new causes of senescence that remain undiscovered today.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/selt/vol1/iss1/art6
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  • 11
    Electronic Resource
    Electronic Resource
    Enhancement in Sport, and Enhancement outside Sport (2007)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Studies in ethics, law and technology 1.2007, 1, art2 
    Details
    ISSN: 1941-6008
    Source: Berkeley Electronic Press Academic Journals
    Topics: Sociology , Technology
    Notes: Sport is one of the first areas in which enhancement has become commonplace. It is also one of the first areas in which the use of enhancement technologies has been heavily regulated. Some have thus seen sport as a testing ground for arguments about whether to permit enhancement. However, I argue that there are fairness-based objections to enhancement in sport that do not apply as strongly in some other areas of human activity. Thus, I claim that there will often be a stronger case for permitting enhancement outside of sport than for permitting enhancement in sport. I end by considering some methodological implications of this conclusion.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/selt/vol1/iss1/art2
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  • 12
    Electronic Resource
    Electronic Resource
    Athlete or Guinea Pig? Sports and Enhancement Research (2007)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Studies in ethics, law and technology 1.2007, 1, art1 
    Details
    ISSN: 1941-6008
    Source: Berkeley Electronic Press Academic Journals
    Topics: Sociology , Technology
    Notes: Bioethics has paid little attention to the issues raised by health in athletic competition, with the single exception of the use of prohibited performance enhancements. However, in competitive athletics, the treatment and prevention of athletic injury and the development of training programs designed to maximize athletic achievement share many characteristics with medical innovation and clinical research, and should be understood to constitute enhancement research.Athletes should, in at least some circumstances, be viewed as vulnerable research subjects, akin to desperate patients. Competitive athletes are often encouraged to sacrifice long-term health benefits for short-term gains; cultural mythology about sports and high-stakes financial investments at the organizational level in team sports exercise great influence on individual athletes' range of choices. Technological advances in training, equipment, and injury treatment serve to raise the bar in competitive athletics, in turn increasing not only the risks of harm but the level of expectation with regard to performance, injury, and recovery. It is common for athletes to seek, and teams to offer, intensive and innovative training regimens from which data are gathered, thus transforming innovation into research.As technology continues to enhance the prospects for athletic enhancement, it is time for bioethics to take a closer look at the way competitive athletics highlights the troubling questions posed by enhancement research.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/selt/vol1/iss1/art1
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  • 13
    Electronic Resource
    Electronic Resource
    Virtue Ethics and Prenatal Genetic Enhancement (2007)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Studies in ethics, law and technology 1.2007, 1, art4 
    Details
    ISSN: 1941-6008
    Source: Berkeley Electronic Press Academic Journals
    Topics: Sociology , Technology
    Notes: In this paper I argue that the virtue ethics tradition can enhance the moral discourse on the ethics of prenatal genetic enhancements in distinctive and valuable ways. Virtue ethics prescribes we adopt a much more provisional stance on the issue of the moral permissibility of prenatal genetic enhancements. A stance that places great care on differentiating between the different stakes involved with developing different phenotypes in our children and the different possible means (environmental vs. genetic manipulation) available to parents for pursuing legitimate concerns of parental love and virtue. Key components of the virtue ethics account of morality, such as the Aristotelian account of happiness, love and the doctrine of the mean, provide an adequate basis for rejecting the claim that it is morally impermissible for parents to pursue (safe and effective) prenatal enhancements. Furthermore, there is good reason to believe that a virtue ethics account of morality could actually support the stronger claim that utilising such interventions can (in certain contexts) be morally required.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/selt/vol1/iss1/art4
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  • 14
    Electronic Resource
    Electronic Resource
    Managing mobile phones: a work/non-work collision in small business (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    Details
    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: We can see technology changing people's private and working lives. But what happens when these two worlds collide? This paper explores two small organisations that have taken different approaches to the use of mobile phone technology. This area of contested terrain is becoming increasingly present on the landscape of the employment relationship.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00158.x
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  • 15
    Electronic Resource
    Electronic Resource
    Teamwork in factories within the French automobile industry (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
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    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: This article analyses teamwork in French car manufacturing plants and those of their suppliers. During the 1990s, the introduction of ‘autonomous production units’ was aimed at reducing costs, increasing quality and shortening delivery deadlines. Teamwork in a unit involved delegating responsibilities to workers and led to an increased workload.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00146.x
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  • 16
    Electronic Resource
    Electronic Resource
    Accidents will happen: safety-critical knowledge and automated control systems (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
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    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: This article presents findings from a study of control operators that raise concerns about safety-critical knowledge, culture and training. It is argued that the adoption of automated control systems can hinder the transfer of knowledge amongst operators, and this becomes an increasingly serious hazard as tacit knowledge is lost because of employee turnover.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00147.x
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  • 17
    Electronic Resource
    Electronic Resource
    The (not so simple) case for teleworking: a study at Lloyd's of London (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
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    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: This paper reports the results of a detailed case study and analysis of a substantial teleworking experiment. The study used rigorous quantitative techniques supported by qualitative methods to examine the business case for teleworking. The research provides evidence that supports some findings of other well-grounded research and questions others.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00148.x
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  • 18
    Electronic Resource
    Electronic Resource
    Most relevant enablers and constraints influencing the spread of telework in Portugal (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
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    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: This paper reports the empirical findings of several surveys conducted among enterprises in Portugal in order to identify and summarise relevant enablers and constraints that may influence the implementation of telework in the Portuguese business environment. It also provided some common characteristics that will help us draw the profile of a Portuguese potential teleworker.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00149.x
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  • 19
    Electronic Resource
    Electronic Resource
    Constructing and using a company Intranet: ‘it's a very cultural thing’ (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
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    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: Organisational Intranets provide a testing ground where certain theories of technology and organisations meet with emerging innovative practice. This paper develops a theoretical framework that is used to analyse a case study of the adoption, introduction and use of a company Intranet focusing on the competing representations of the Intranet presented by the staff involved.
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    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00150.x
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  • 20
    Electronic Resource
    Electronic Resource
    Invisible work, invisible skills: interactive customer service as articulation work (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
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    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: The concept of emotional labour provides an incomplete account of interactive service work, underplaying its invisible cognitive and non-routine elements. In interactive work, from customer service jobs in the fast food industry to ‘knowledge work’ and at those levels in between on which we focus here, many jobs involve ‘articulation work’—the often unacknowledged management of awkward intersections among the social worlds of people, technology and organisations.
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    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00151.x
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  • 21
    Electronic Resource
    Electronic Resource
    The adoption and use of information technology: a longitudinal study of a mature family firm (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
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    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: Through a longitudinal study of a mature family firm, this paper investigates the adoption and use of information technology in a family business. It is argued that the adoption and use of information technology is influenced by five key factors. These factors are discussed, leading to a presentation of a series of implications and conclusions.
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    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00140.x
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  • 22
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    Hybrid workspace: re-spatialisations of work, organisation and management (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
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    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: New information and communication technologies enable the spatial reconfiguration of work opening up possibilities for work to take place across multiple locations. This paper explores the implications of hybrid workspace through a new empirical study. It argues that spatial hybridity changes the nature of work, organisation and management across domestic space, organisational space and in cyberspace.
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    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00141.x
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  • 23
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    The character of telework and the characteristics of teleworkers (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
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    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: A flexible definition of teleworking suggests that it is more widespread than is generally believed. However, is telework technologically driven? This is tested with data from six countries. As the categories of the definition have distinctive social characteristics, telework seems to reflect traditional occupational practices rather than a major technological shift.
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    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00142.x
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  • 24
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    Electronic surveillance and cohesive teams: room for resistance in an Australian call centre? (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
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    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: A number of employees individually and cooperatively resist the controls of the electronic surveillance systems in the PowerGrid call centre. However, this is not the case in all teams. One team is faced with a labour process that directs their resistance to be focused directly at management, rather than at management via the machine.
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    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00143.x
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  • 25
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    The determinants of ICT competencies among employees (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
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    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: This study aims to explain employees’ adaptability to information and communications technology (ICT), using a representative sample of 713 employees in the Netherlands. The willingness to acquire ICT competencies and the mastery of equipment and software are primarily affected by intensity of ICT use, an informated ICT strategy of the organisation and an intensive personnel policy.
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    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00144.x
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  • 26
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    The effect of training for internet use among local trade union leaders (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
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    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: Internet use is increasing among all segments of society, including labour unions. In this article, the authors examine the role that training plays in internet use among union leaders. A survey was conducted among union leaders in a large Midwestern state with an economy widely spread among agricultural, manufacturing, mining, transportation and public sectors. Applying theories of technology acceptance and social learning, the researchers proposed that formal training leads to internet use and that formal training reduces problems encountered by internet users. Formal training was found to have a significant relationship with both the use and reduction of many of the problems associated with internet use.
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    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00145.x
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    Editorial: small firms and new technology (2005)
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
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    ISSN: 1468-005X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-005X.2005.00152.x
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    DEVELOPMENT OF EMPIRICAL, GEOGRAPHICALLY SPECIFIC WATER QUALITY CRITERIA: A CONDITIONAL PROBABILITY ANALYSIS APPROACH (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: The need for scientifically defensible water quality standards for nonpoint source pollution control continues to be a pressing environmental issue. The probability of impact at differing levels of nonpoint source pollution was determined using the biological response of instream organisms empirically obtained from a statistical survey. A conditional probability analysis was used to calculate a biological threshold of impact as a function of the likelihood of exceeding a given value of pollution metric for a specified geographic area. Uncertainty and natural variability were inherently incorporated into the analysis through the use of data from a probabilistic survey. Data from wadable streams in the mid-Atlantic area of the U.S. were used to demonstrate the approach. Benthic macroinvertebrate community index values (EPT taxa richness) were used to identify impacted stream communities. Percent fines in substrate (silt/clay fraction, 〉 0.06 mm) were used as a surrogate indicator for sedimentation. Thresholds of impact due to sedimentation were identified by three different techniques, and were in the range of 12 to 15 percent fines. These values were consistent with existing literature from laboratory and field studies on the impact of sediments on aquatic life in freshwater streams. All results were different from values determined from current regulatory guidance. Finally, it was illustrated how these thresholds could be used to develop criterion for protection of aquatic life in streams.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03795.x
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    PHYSICAL HYDROLOGY AND THE EFFECTS OF FOREST HARVESTING IN THE PACIFIC NORTHWEST: A REVIEW (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: The Pacific Northwest encompasses a range of hydrologic regimes that can be broadly characterized as either coastal (where rain and rain on snow are dominant) or interior (where snowmelt is dominant). Forest harvesting generally increases the fraction of precipitation that is available to become streamflow, increases rates of snowmelt, and modifies the runoff pathways by which water flows to the stream channel. Harvesting may potentially decrease the magnitude of hyporheic exchange flow through increases in fine sediment and clogging of bed materials and through changes in channel morphology, although the ecological consequences of these changes are unclear. In small headwater catchments, forest harvesting generally increases annual runoff and peak flows and reduces the severity of low flows, but exceptions have been observed for each effect. Low flows appear to be more sensitive to transpiration from vegetation in the riparian zone than in the rest of the catchment. Although it appears that harvesting increased only the more frequent, geomorphically benign peak flows in several studies, in others the treatment effect increased with return period. Recovery to pre-harvest conditions appeared to occur within about 10 to 20 years in some coastal catchments but may take many decades in mountainous, snow dominated catchments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03770.x
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    PATTERNS OF WATERSHED URBANIZATION AND IMPACTS ON WATER QUALITY (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Urban runoff contributes to nonpoint source pollution, but there is little understanding of the way that pattern and extent of urbanization contributes to this problem. Indicators of type and density of urbanization and access to municipal services were examined in six urban watersheds in Durham, North Carolina. Principal components analysis (PCA) was used to identify patterns in the distribution of these variables across the urban landscape. While spatial variation in urban environments is not perfectly captured by any one variable, the results suggest that most of the variation can be explained using several variables related to the extent and distribution of urban development. Multiple linear regression models were fit to relate these urbanization indicators to total phosphorus, total kjeldahl nitrogen, total suspended solids, and fecal coliforms. Development density was correlated to decreased water quality in each of the models. Indicators of urbanization type such as the house age, amount of contiguous impervious surface, and stormwater connectivity explained additional variation. In the nutrient models, access to city services was also an important factor. The results indicate that while urbanization density is important in predicting water quality, indicators of urbanization type and access to city services help explain additional variation in the models.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03764.x
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    ARE RURAL RESIDENTS WILLING TO PAY ENOUGH TO IMPROVE DRINKING WATER QUALITY? (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The concentrations of iron and sulfate in community water supplies are a concern for a number of areas in southwestern Minnesota. This study used the contingent valuation method to determine how much consumers would be willing to pay to improve their drinking water quality. On average, individuals were willing to pay US$5.25 per month (in 1995 U.S. dollars) to reduce the level of iron and US$4.33 per month to reduce the level of sulfate in their water to the USEPA's secondary standards for drinking water quality. Respondents with negative perceptions of their drinking water quality were willing to pay more to improve water quality. The aggregate annual willingness to pay (WTP) for all consumers in community water systems in southwestern Minnesota that were out of compliance with water quality standards were estimated to be US$2.4 million and US$2.0 million (in 1995 dollars) for reducing the levels of iron and sulfate, respectively. Yet the total WTP of consumers who use small community water systems may not be enough to pay the full cost of providing improved water in those systems. Economies of scale in water treatment and difficulties in financing improvements mean that technical innovation, government assistance, or institutional changes may be needed to improve water quality in these areas.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03767.x
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    WATER QUALITY IMPROVEMENT PROGRAM EFFECTIVENESS FOR CARBONATE AQUIFERS IN GRAZED LAND WATERSHEDS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Water quality indicators of two agriculturally impacted karst areas in southeastern West Virginia were studied to determine the water quality effects of grazing agriculture and water quality trends following initiation of water quality improvement programs. Both areas are tributaries of the Greenbrier River and received funding for best management practices under the President's Initiative for Water Quality and then under the Environmental Quality Incentives Program (EQIP). After 11 years of study there was little evidence to suggest that water quality improved in one area. Three and a half years of study in the other area showed little evidence of consistent water quality improvement under EQIP. Lack of consistent water quality improvement at the catchment scale does not imply that the voluntary programs were failures. Increased livestock numbers as a result of successful changes in forage management practices may have overridden water quality improvements achieved through best management practices. Practices that target well defined contributing areas significantly impacting aquifer water quality might be one way to improve water quality at catchment scales in karst basins. For example, a significant decrease in fecal coliform concentrations was observed in subterranean drainage from one targeted sinkhole after dairy cattle were permanently excluded from the sinkhole.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03735.x
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    GLYPHOSATE, OTHER HERBICIDES, AND TRANSFORMATION PRODUCTS IN MIDWESTERN STREAMS, 20021 (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The use of glyphosate has increased rapidly, and there is limited understanding of its environmental fate. The objective of this study was to document the occurrence of glyphosate and the transformation product aminomethylphosphonic acid (AMPA) in Midwestern streams and to compare their occurrence with that of more commonly measured herbicides such as acetochlor, atrazine, and metolachlor. Water samples were collected at sites on 51 streams in nine Midwestern states in 2002 during three runoff events: after the application of pre-emergence herbicides, after the application of post-emergence herbicides, and during harvest season. All samples were analyzed for glyphosate and 20 other herbicides using gas chromatography/mass spectrometry or high performance liquid chromatography/mass spectrometry. The frequency of glyphosate and AMPA detection, range of concentrations in runoff samples, and ratios of AMPA to glyphosate concentrations did not vary throughout the growing season as substantially as for other herbicides like atrazine, probably because of different seasonal use patterns. Glyphosate was detected at or above 0.1 μg/1 in 35 percent of pre-emergence, 40 percent of post-emergence, and 31 percent of harvest season samples, with a maximum concentration of 8.7 μg/1. AMPA was detected at or above 0.1 μg/1 in 53 percent of pre-emergence, 83 percent of post-emergence, and 73 percent of harvest season samples, with a maximum concentration of 3.6 μg/1. Glyphosate was not detected at a concentration at or above the U.S. Environmental Protection Agency's maximum contamination level (MCL) of 700 μg/1 in any sample. Atrazine was detected at or above 0.1 μg/1 in 94 percent of pre-emergence, 96 percent of post-emergence, and 57 percent of harvest season samples, with a maximum concentration of 55 μg/1. Atrazine was detected at or above its MCL (3 μg/1) in 57 percent of pre-emergence and 33 percent of post-emergence samples.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03738.x
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    APPLICATION OF PARAMETER OPTIMIZATION METHOD FOR CALIBRATING TANK MODEL (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Many automatic calibration processes have been proposed to efficiently calibrate the 16 parameters involved in the four-layered tank model. The Multistart Powell and Stuffed Complex Evolution (SCE) methods are considered the best two procedures. Two rainfall events were designed to compare the performance and efficiency of these two methods. The first rainfall event is short term and the second designed for long term rainfall data collection. Both rainfall events include a lengthy no-rainfall period. Two sets of upper and lower values for the search range were selected for the numerical tests. The results show that the Multistart Powell and SCE methods are able to obtain the true values for the 16 parameters with a sufficiently long no-rainfall period after a rainfall event. In addition, by using two selected objective functions, one based on root mean square error and one based on root mean square relative error criteria, it is found that the no-rainfall period lengths necessary to obtain the converged true values for the 16 parameters are roughly the same. The SCE method provides a more efficient search based on an appropriate preliminary search range. The Multistart Powell method, on the other hand, leads to more accurate search results when there is no suitable search range selected based on the parameter calibration experience.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03743.x
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    NUTRIENT AND β17-ESTRADIOL LOSS IN RUNOFF WATER FROM POULTRY LITTERS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : A main water quality concern is accelerated eutrophication of fresh waters from nonpoint source pollution, particularly nutrient transport in surface runoff from agricultural areas and confined animal feeding operations. This study examined nutrient and β17-estradiol concentrations in runoff from small plots where six poultry litters were applied at a rate of about 67 kg/ha of total phosphorus (TP). The six poultry litter treatments included pelleted compost, pelleted litter, raw litter, alum (treated) litter, pelleted alum litter, and normal litter (no alum). Four replicates of the six poultry litter treatments and a control (plots without poultry litter application) were used in this study. Rainfall simulations at intensity of 50 mm/hr were conducted immediately following poultry litter application to the plots and again 30 days later. Composite runoff samples were analyzed for soluble reactive phosphorus (SRP), ammonia (NH4), nitrate (NO3), TP, total nitrogen (TN) and β17-estradiol concentrations. In general, poultry litter applications increased nutrient and β17-estradiol concentrations in runoff water. Ammonia and P concentrations in runoff water from the first simulation were correlated to application rates of water extractable NH4 (R2= 0.70) and P (R2= 0.68) in the manure. Results suggest that alum applications to poultry litter in houses in between flocks is an effective best management practice for reducing phosphorus (P) and β17-estradiol concentrations in runoff and that pelleted poultry litters may increase the potential for P and β17-estradiol loss in runoff water. Inferences regarding pelleted poultry litters should be viewed cautiously, because the environmental consequence of pelleting poultry litters needs additional investigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03732.x
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    BIOECONOMIC ANALYSIS OF SELECTED CONSERVATION PRACTICES ON SOIL EROSION AND FRESHWATER FISHERIES (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Farmers can generate environmental benefits (improved water quality and fisheries and wildlife habitat), but they may not be able to quantify them. Furthermore, farmers may reduce their incomes from managing lands to produce these positive externalities but receive little monetary compensation in return. This study simulated the relationship between agricultural practices, water quality, fish responses to suspended sediment and farm income within two small watersheds, one of a cool water stream and one of a warm water stream. Using the Agricultural Drainage and Pesticide Transport (ADAPT) model, this study related best management practices (BMPs) to calculated instream suspended sediment concentrations by estimating sediment delivery, runoff, base flow, and streambank erosion to quantify the effects of suspended sediment exposure on fish communities. By implementing selected BMPs in each watershed, annual net farm income declined $18,000 to $28,000 (1 to 3 percent) from previous levels. “Lethal” fish events from suspended sediments in the cool water watershed decreased by 60 percent as conservation tillage and riparian buffers increased. Despite reducing suspended sediments by 25 percent, BMPs in the warm water watershed did not reduce the negative response of the fisheries. Differences in responses (physical and biological) between watersheds highlight potential gains in economic efficiency by targeting BMPs or by offering performance based “green payments.”
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03737.x
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    WATERSHED SCALE MODELING OF CRITICAL SOURCE AREAS OF RUNOFF GENERATION AND PHOSPHORUS TRANSPORT (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : A curve number based model, Soil and Water Assessment Tool (SWAT), and a physically based model, Soil Moisture Distribution and Routing (SMDR), were applied in a headwater watershed in Pennsylvania to identify runoff generation areas, as runoff areas have been shown to be critical for phosphorus management. SWAT performed better than SMDR in simulating daily streamflows over the four-year simulation period (Nash-Sutcliffe coefficient: SWAT, 0.62; SMDR, 0.33). Both models varied streamflow simulations seasonally as precipitation and watershed conditions varied. However, levels of agreement between simulated and observed flows were not consistent over seasons. SMDR, a variable source area based model, needs further improvement in model formulations to simulate large peak flows as observed. SWAT simulations matched the majority of observed peak flow events. SMDR overpredicted annual flow volumes, while SWAT underpredicted the same. Neither model routes runoff over the landscape to water bodies, which is critical to surface transport of phosphorus. SMDR representation of the watershed as grids may allow targeted management of phosphorus sources. SWAT representation of fields as hydrologic response units (HRUs) does not allow such targeted management.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03741.x
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    WATERSHED BASED, INSTITUTIONAL APPROACH TO DEVELOPING CLEAN WATER RESOURCES (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Access to clean and sufficient amounts of water is a critical problem in many countries. A watershed approach is vital in understanding pollution pathways affecting water resources and in developing participatory solutions. Such integration of information with participatory approaches can lead to more sustainable solutions than traditional “crisis-to-crisis” management approaches. This study aims at applying a watershed based joint action approach to manage water resources. Since most watersheds have urban and rural sources of pollution and a wide disparity in access to and use of water, alternative solutions need to take an integrated approach through cooperative actions. An institutional model was applied to seven subwatersheds in Honduras to evaluate various sources and effects of water contamination and water shortages. Two specific pathways of water resources degradation were studied (contamination from coffee pulp manufacturing and urban nonpoint sources) to develop alternative solutions that mitigate downstream impacts of access to clean water. A locally driven joint mechanism to reuse coffee pulp in farming systems is proposed. Such an institutional solution can maximize benefits to both farms and the coffee pulp industry. A combination of education and investment in sanitary facilities in urbanizing areas is proposed to minimize urban sources of water contamination.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03745.x
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    WAVE INDUCED FLOW AND TRANSPORT IN SEDIMENT BEDS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The fate of contaminants in large water bodies is highly influenced by the transfer of flow and solutes across the water sediment interface. In this paper, an analytical model is presented where flow in both sediment bed and open channel is coupled at the interface through a boundary layer occupying the upper part of the sediment bed. The presence of this layer allows not only the capture of the inertia effects through a drag term in the generalized Darcy's equation, but also the specification of different soil parameters for the two porous zones. The flow is advective and driven by wave action along the water surface. The resulting system is solved for the pressure and flux in each sediment layer. The generated transport velocity fields are linked to a random walk simulation that is used to examine the trajectories of solute particles. Comparison of these trajectories against experimental tracer tests suggests a pattern very similar to the one attributed to the presence of surface mounds. The results clearly show the significance of the boundary layer and the drag term for soil with high permeability and the impact of both the thickness of the boundary layer and the length of the gravity wave relative to the depth of the water channel on the transport and exchange across the interface. The paper also examines the sensitivity of the mass exchange to the permeability of the two porous zones.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03749.x
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    PREDICTING THE SUMMER TEMPERATURE OF SMALL STREAMS IN SOUTHWESTERN WISCONSIN (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : One of the biggest challenges in managing cold water streams in the Midwest is understanding how stream temperature is controlled by the complex interactions among meteorologic processes, channel geometry, and ground water inflow. Inflow of cold ground water, shade provided by riparian vegetation, and channel width are the most important factors controlling summer stream temperatures. A simple screening model was used to quantitatively evaluate the importance of these factors and guide management decisions. The model uses an analytical solution to the heat transport equation to predict steady-state temperature throughout a stream reach. The model matches field data from four streams in southwestern Wisconsin quite well (typically within 1°C) and helps explain the observed warming and cooling trends along each stream reach. The distribution of ground water inflow throughout a stream reach has an important influence on stream temperature, and springs are especially effective at providing thermal refuge for fish. Although simple, this model provides insight into the importance of ground water and the impact different management strategies, such as planting trees to increase shade, may have on summer stream temperature.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03714.x
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    AN APPLICATION OF THE ANALYTIC ELEMENT METHOD IN MODELING FLORIDA EVERGLADES HYDROLOGY (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The large volumes of ground water that are discharged from the Everglades toward the Miami metropolitan area have historically posed a significant environmental water supply problem. In order to analyze the effects of seepage barriers on these subsurface outflows, the analytic element modeling code GFLOW was used to construct a ground water flow model of a region that includes a portion of the Everglades along with adjacent developed areas. The hydrology of this region can be characterized by a highly transmissive surficial aquifer in hydraulic contact with wetlands and canals. Calibration of the model to both wet and dry season conditions yielded satisfactory results, and it was concluded that the analytic element method is a suitable technique for modeling ground water flow in the Everglades environment. Finally, the model was used to evaluate the potential effectiveness of a subsurface barrier approximately two miles long for increasing water levels within the adjacent fringes of the Everglades National Park. It was found that the barrier had a negligible effect on water levels due to both its relatively short length and the high transmissivity of the surficial aquifer.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03718.x
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    A MORPHOLOGICAL AND ECONOMIC EXAMINATION OF PLUNGE POOLS AS ENERGY DISSIPATERS IN URBAN STREAM CHANNELS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Naturally formed plunge pools (scour holes) are a common morphologic feature in many urban stream systems where the transition between a pipe and a natural channel occurs. Plunge pools serve as significant stream energy dissipaters, increasing flow resistance and enhancing stream channel stability. Such features may also improve habitat diversity and serve as refugia for stream biota during low flow periods. The morphologic characteristics of several naturally formed plunge pools associated with road crossing culvert outlets in the metropolitan Charlotte, North Carolina, area are presented. Plunge pool dimensions surveyed include maximum depth, length, and width, and longitudinal and side slopes as well as bed material. Culvert outlet dimensions and hydraulic characteristics of the scouring jet for each study site are also reported. Design equations developed from flume studies generally failed to predict the naturally formed plunge pool dimensions. Pool volume was significantly correlated with drainage area, with pool depth being the least sensitive dimension to changes in the magnitude of the scouring flow. The excavation costs for designed plunge pools compare favorably to initial construction costs of traditional culvert outlet riprap aprons.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03722.x
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    COLLABORATIVE ENVIRONMENTAL DECISION MAKING IN OREGON WATERSHED GROUPS: PERCEPTIONS OF EFFECTIVENESS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Collaborative watershed groups have formed at a significant rate throughout the United States in the last decade. Data on these groups, however, has been largely anecdotal and lacking in rigorous examination of the relationship between group formation, membership, process, and group effectiveness. Using a mail survey, Oregon watershed group participants were asked to identify who initiated the formation of the group, how efficiently the group formed, how the group determines membership, what decision making method the group uses, and how members perceive the group's effectiveness. Findings indicated that a majority believe that, because of their participation in a watershed group, they better understand issues in the watershed and the perspectives of others, but less than half believe that relationships with government decision makers or physical conditions in the watershed have improved. Members of citizen initiated groups rated their groups higher than government initiated groups on addressing difficult or controversial issues. Members of groups that use consensus responded most positively on whether the group gives fair consideration to dissenting opinions. Overall, groups with restricted membership systems rated themselves lowest on involving key decision making groups, timeliness in addressing issues, and overall effectiveness. These results raise concerns about this type of group membership system.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03726.x
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    VELOCITY DISTRIBUTIONS IN STREAMBED SIMULATION CULVERTS USED FOR FISH PASSAGE (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Stream crossings designed to simulate a natural streambed inside a culvert are commonly used to meet criteria where fish passage is required. Currently, there has been little research that quantitatively examines the flow patterns within these streambed simulation culverts. A model is presented that estimates the percent of a cross section that is within the swimming ability of juvenile fish developed from velocity measurements on first-generation stream simulation culverts — those culverts with a continuous gravel bed. The model, developed with regression techniques, uses physical and hydraulic parameters including discharge, total cross sectional area, Froude number, and relative roughness, and was tested directly against velocity distributions computed from field measurements and in a culvert design mode. Results were favorable, although larger percentage errors exist, particularly at small flow depths. The model appears to underestimate the percent of channel cross section at or below a limiting velocity, hence it is generally conservative in design mode.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03729.x
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    BASIN SCALE WATER MANAGEMENT AND FORECASTING USING ARTIFICIAL NEURAL NETWORKS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Water scarcity in the Sevier River Basin in south-central Utah has led water managers to seek advanced techniques for identifying optimal forecasting and management measures. To more efficiently use the limited quantity of water in the basin, better methods for control and forecasting are imperative. Basin scale management requires advanced forecasts of the availability of water. Information about long term water availability is important for decision making in terms of how much land to plant and what crops to grow; advanced daily predictions of streamflows and hydraulic characteristics of irrigation canals are of importance for managing water delivery and reservoir releases; and hourly forecasts of flows in tributary streams to account for diurnal fluctuations are vital to more precisely meet the day-to-day expectations of downstream farmers. A priori streamflow information and exogenous climate data have been used to predict future streamflows and required reservoir releases at different timescales. Data on snow water equivalent, sea surface temperatures, temperature, total solar radiation, and precipitation are fused by applying artificial neural networks to enhance long term and real time basin scale water management information. This approach has not previously been used in water resources management at the basin-scale and could be valuable to water users in semi-arid areas to more efficiently utilize and manage scarce water resources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03728.x
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    PREDICTING FECAL COLIFORM BACTERIA LEVELS IN THE CHARLES RIVER, MASSACHUSETTS, USA (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: In Massachusetts, the Charles River Watershed Association conducts a regular water quality monitoring and public notification program in the Charles River Basin during the recreational season to inform users of the river's health. This program has relied on laboratory analyses of river samples for fecal coliform bacteria levels, however, results are not available until at least 24 hours after sampling. To avoid the need for laboratory analyses, ordinary least squares (OLS) and logistic regression models were developed to predict fecal coliform bacteria concentrations and the probabilities of exceeding the Massachusetts secondary contact recreation standard for bacteria based on meteorological conditions and streamflow. The OLS models resulted in adjusted R2s ranging from 50 to 60 percent. An uncertainty analysis reveals that of the total variability of fecal coliform bacteria concentrations, 45 percent is explained by the OLS regression model, 15 percent is explained by both measurement and space sampling error, and 40 percent is explained by time sampling error. Higher accuracy in future bacteria forecasting models would likely result from reductions in laboratory measurement errors and improved sampling designs.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03794.x
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    REPLY TO DISCUSSION by John M. Faustini (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03798.x
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    RIPARIAN MICROCLIMATE AND STREAM TEMPERATURE RESPONSE TO FOREST HARVESTING: A REVIEW (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Forest harvesting can increase solar radiation in the riparian zone as well as wind speed and exposure to air advected from clearings, typically causing increases in summertime air, soil, and stream temperatures and decreases in relative humidity. Stream temperature increases following forest harvesting are primarily controlled by changes in insolation but also depend on stream hydrology and channel morphology. Stream temperatures recovered to pre-harvest levels within 10 years in many studies but took longer in others. Leaving riparian buffers can decrease the magnitude of stream temperature increases and changes to riparian microclimate, but substantial warming has been observed for streams within both unthinned and partial retention buffers. A range of studies has demonstrated that streams may or may not cool after flowing from clearings into shaded environments, and further research is required in relation to the factors controlling downstream cooling. Further research is also required on riparian microclimate and its responses to harvesting, the influences of surface/subsurface water exchange on stream and bed temperature regimes, biological implications of temperature changes in headwater streams (both on site and downstream), and methods for quantifying shade and its influence on radiation inputs to streams and riparian zones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03772.x
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    LIVESTOCK GRAZING MANAGEMENT IMPACTS ON STREAM WATER QUALITY: A REVIEW (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Controlling agricultural nonpoint source pollution from livestock grazing is a necessary step to improving the water quality of the nation's streams. The goal of enhanced stream water quality will most likely result from the implementation of an integrated system of best management practices (BMPs) linked with stream hydraulic and geomorphic characteristics. However, a grazing BMP system is often developed with the concept that BMPs will function independently from interactions among controls, climatic regions, and the multifaceted functions exhibited by streams. This paper examines the peer reviewed literature pertaining to grazing BMPs commonly implemented in the southern humid region of the United States to ascertain effects of BMPs on stream water quality. Results indicate that the most extensive BMP research efforts occurred in the western and midwestern U.S. While numerous studies documented the negative impacts of grazing on stream health, few actually examined the success of BMPs for mitigating these effects. Even fewer studies provided the necessary information to enable the reader to determine the efficacy of a comprehensive systems approach integrating multiple BMPs with pre-BMP and post-BMP geomorphic conditions. Perhaps grazing BMP research should begin incorporating geomorphic information about the streams with the goal of achieving sustainable stream water quality.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03757.x
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    STREAM HEALTH RANKINGS PREDICTED BY SATELLITE DERIVED LAND COVER METRICS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Land cover and land use change have long been known to influence the chemical, physical, and biological characteristics of streams. This study makes use of land cover maps derived from fine resolution satellite imagery and an extensive stream quality dataset to determine the relationship between small watershed health rankings and land cover composition and configuration. Landscape metrics were derived from digital impervious surface area (ISA), tree cover (percent), and agricultural crop maps within Montgomery County, Maryland. Watershed rankings were developed by state and county collaborators (MD-DNR and MCDEP) using extensive biological and chemical measurements. In stepwise logistic regression models the factors accounting for the most variation in stream health ranking were the percent ISA, followed by the percent of tree cover. Riparian buffer zone tree cover was also a significant predictor. Of the metrics that considered the spatial configuration of the landscape, a contagion index and the percent of ISA in the flow path from the ISA to the stream were also found to be significant predictors of stream health. Despite limited ability to characterize landscape configuration or narrow riparian buffer zone vegetation with coarser resolution imagery (from Landsat), model results were not significantly different from those based on the use of fine-resolution ISA information, suggesting that broader area applications of the approach are possible. The results indicate that management practices designed to improve stream water quality should focus on the amount of ISA and tree cover in both the watershed and within the buffer zone.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03762.x
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    ERRATA (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03768.x
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    IRRIGATION METHODS AND TRANSPORT OF IMAZAMETHABENZ-METHYL TO GROUND WATER: GREENFIELDS BENCH, MONTANA (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : A series of gravel terraces support a shallow aquifer that is the sole source of drinking water for three public water supplies and more than 400 private wells on the Greenfields Bench in west-central Montana. Farming practices on the Greenfields Bench include irrigation of malting barley and the yearly application of herbicides for the control of weeds. The most commonly used herbicide (imazamethabenz-methyl, U.S. trade name Assert®) has been found in the ground water on the Greenfields Bench. An experiment was conducted in 2000 and 2001 to characterize the transport of Assert and its acid metabolite to ground water under three irrigation methods: flood, wheel line sprinkler, and center pivot sprinkler. Results show that Assert concentrations in ground water are controlled by hydraulic loading rates of each irrigation method, Assert persistence in soil, hydraulic characteristics of the aquifer, and adsorption/desorption of Assert onto clay particles and organic matter.
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    ABATEMENT OF GROUND WATER PHOSPHATE IN GIANT CANE AND FOREST RIPARIAN BUFFERS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Forest and grass riparian buffers have been shown to be effective best management practices for controlling nonpoint source pollution. However, little research has been conducted on giant cane [Arundinaria gigantea (Walt. Muhl.)], a formerly common bamboo species, native to the lower midwestern and southeastern United States, and its ability to reduce nutrient loads to streams. From May 2002 through May 2003, orthophosphate or dissolved reactive phosphate (DRP) concentrations in ground water were measured at successive distances from the field edge through 12 m of riparian buffers of both giant cane and mixed hardwood forest along three streams draining agricultural land in the Cache River watershed in southern Illinois. Giant cane and mixed hardwood forest did not differ in their DRP sequestration abilities. Ground water DRP concentrations were significantly reduced (14 percent) in the first 1.5 m of the buffers, and there was an overall 28 percent reduction in DRP concentration by 12 m from the field edge. The relatively low DRP reductions compared to other studies could be attributed to high DRP input levels, narrow (12 m) buffer lengths, and/or mature (28 to 48 year old) riparian vegetation.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03736.x
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    DISTRIBUTED RUNOFF FORMULATION DESIGNED FOR A PRECISION AGRICULTURAL LANDSCAPE MODELING SYSTEM (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: A precision scale landscape model designed for agricultural applications is described in this paper. The Precision Agricultural Landscape Modeling System (PALMS) is a combination of two process-based models: a diffusive wave runoff model with ponding (described in detail) and a biosphere model with a crops module (briefly reviewed). Several innovations, including numerical formulations for the hydrologic properties of the soil surface with crusting, slope/tillage angle interactions, and change of roughness and detention storage with cumulative precipitation have been included. The model is compared to observations on one 1.8 ha field planted with maize and soybeans during four growing seasons, and one 24 ha field planted with maize during one growing season. Daily average soil moisture is simulated well (within 5 percent volumetric), except in extended runoff/ponding episodes. Physical processes not simulated in the model suggest possible explanations for model errors. Planned improvements for PALMS are also presented.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03801.x
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    BENEFITS OF ITERATIVE WATER SUPPLY FORECASTING IN THE WASHINGTON, D.C., METROPOLITAN AREA (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: The three largest water utilities in the Washington, D.C., metropolitan area (WMA) rely on the Potomac River and its reservoirs for water supply. These utilities have committed to a periodic review of the system's adequacy to meet future demands. In 1990, 1995, 2000, and again in 2004 (for publication in 2005) the utilities requested that the Interstate Commission on the Potomac River Basin (ICPRB) conduct a 20-year water demand and resource adequacy study to fulfill this need. The selection of the five-year interval provides multiple benefits. It allows regular updates and incorporation of recent demographic forecasts, and it increases visibility and understanding of the adequacy of the region's water resources. It also provides adequate time to conduct research on the physical system and to incorporate modifications based on this research into subsequent studies. The studies and lessons learned are presented in this case study of the WMA. The work has been a natural outgrowth of a long history of cooperative water supply planning and management among the main WMA water utilities and ICPRB.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03809.x
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    MODELING THE DISTRIBUTION OF DIFFUSE NITROGEN SOURCES AND SINKS IN THE NEUSE RIVER BASIN OF NORTH CAROLINA, USA (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: This study quantified nonpoint source nitrogen (NPS-N) sources and sinks across the 14,582 km2 Neuse River Basin (NRB) located in North Carolina, to provide tabular data summaries and graphic overlay products to support the development of management approaches to best achieve established N reduction goals. First, a remote sensor derived, land cover classification was performed to support modeling needs. Modeling efforts included the development of a mass balance model to quantify potential N sources and sinks, followed by a precipitation event driven hydrologic model to effectively transport excess N across the landscape to individual stream reaches to support subsequent labeling of transported N values corresponding to source origin. Results indicated that agricultural land contributed 55 percent of the total annual NPS-N loadings, followed by forested land at 23 percent (background), and urban areas at 21 percent. Average annual N source contributions were quantified for agricultural (1.4 kg/ha), urban (1.2 kg/ha), and forested cover types (0.5 kg/ha). Nonpoint source-N contributions were greatest during the winter (40 percent), followed by spring (32 percent), summer (28 percent), and fall (0.3 percent). Seasonal total N loadings shifted from urban dominated and forest dominated sources during the winter, to agricultural sources in the spring and summer. A quantitative assessment of the significant NRB land use activities indicated that high (greater than 70 percent impervious) and medium (greater than 35 percent impervious) density urban development were the greatest contributors of NPS-N on a unit area basis (1.9 and 1.6 kg/ha/yr, respectively), followed by row crops and pasture/hay cover types (1.4 kg/ha/yr).
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    “Sediment Dispersion in Salmon Spawning Streams: The Influence of Floods and Salmon Redd Construction,” by Allen S. Gottesfeld, Marwan A. Hassan, Jon F. Tunnicliffe and Ron W. Poirier (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03797.x
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    SMALL STREAM CHANNELS AND THEIR RIPARIAN ZONES IN FORESTED CATCHMENTS OF THE PACIFIC NORTHWEST: INTRODUCTION (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03769.x
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    SUSPENDED SEDIMENT DYNAMICS IN SMALL FOREST STREAMS OF THE PACIFIC NORTHWEST (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: This paper reviews suspended sediment sources and transport in small forest streams in the Pacific Northwest region of North America, particularly in relation to riparian management. Mass movements, reading and yarding practices, and burning can increase the supply of suspended sediment. Sediment yields recovered to pre-harvest levels within one to six years in several paired catchment studies. However, delayed mass movements related to roads and harvesting may produce elevated suspended sediment yield one or more decades after logging. There is mixed evidence for the role of streamside tree throw in riparian buffers in supplying sediment to streams. Harvesting within the riparian zone may not increase suspended sediment yield if near stream soils are not disturbed. Key knowledge gaps relate to the relative roles of increased transport capacity versus sediment supply, the dynamics of fine sediment penetration into bed sediments, and the effects of forest harvesting on suspended sediment at different scales. Future research should involve nested catchments to examine suspended sediment response to forest practices at multiple spatial scales, in combination with process-based field studies.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03775.x
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    DROUGHT, TREE RINGS, AND RESERVOIR DESIGN (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Droughts constitute one of the most important factors affecting the design and operation of water resources infrastructure. Hydrologists ascertain their duration, severity, and pattern of recurrence from instrumental records of precipitation or stream-flow. Under suitable conditions, and with proper analysis, tree rings obtained from long living, climate sensitive species of trees can extend instrumental records of streamflow and precipitation over periods spanning several centuries. Those tree-ring “reconstructions” provide a valuable insight about climate variability and drought occurrence in the Holocene, and yield long term hydrological data useful in the design of water infrastructure. This work presents a derivation of drought risk based on a renewal model of drought recurrence, a brief review of the basic theory of tree-ring reconstructions, and a stochastic model for optimizing the design of water supply reservoirs. Examples illustrate the methodology developed in this work and the supporting role that tree-ring reconstructed streamflow can play in characterizing hydrologic variability.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03779.x
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    ACCURACY OF LAKE AND STREAM TEMPERATURES ESTIMATED FROM THERMAL INFRARED IMAGES (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Emitted thermal infrared radiation (TIR, λ= 8 to 14 μm) can be used to measure surface water temperatures (top approximately 100 μm). This study evaluates the accuracy of stream (50 to 500 m wide) and lake (300 to 5,000 m wide) radiant temperatures (15 to 22°C) derived from airborne (MASTER, 5 to 15 m) and satellite (ASTER 90 m, Landsat ETM+ 60 m) TIR images. Applied atmospheric compensations changed water temperatures by −0.2 to +2.0°C. Atmospheric compensation depended primarily on atmospheric water vapor and temperature, sensor viewing geometry, and water temperature. Agreement between multiple TIR bands (MASTER - 10 bands, ASTER - 5 bands) provided an independent check on recovered temperatures. Compensations improved agreement between image and in situ surface temperatures (from 2.0 to 1.1°C average deviation); however, compensations did not improve agreement between river image temperatures and loggers installed at the stream bed (from 0.6 to 1.6°C average deviation). Analysis of field temperatures suggests that vertical thermal stratification may have caused a systematic difference between instream gage temperatures and corrected image temperatures. As a result, agreement between image temperatures and instream temperatures did not imply that accurate TIR temperatures were recovered. Based on these analyses, practical accuracies for corrected TIR lake and stream surface temperatures are around 1°C.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03791.x
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    ORGANIC MATTER DYNAMICS IN SMALL STREAMS OF THE PACIFIC NORTHWEST (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Small streams in forested landscapes are tightly coupled to the vegetation of the surrounding forest, and one of the key drivers of the stream ecosystem is the nature of organic matter supplied to it. This paper is focussed on three questions related to organic matter dynamics in small, forested streams of the conifer dominated Pacific Northwest: (1) How do small streams differ from large streams? (2) How do small streams of the Pacific Northwest differ from those of other regions? and (3) How do forest practices alter organic matter dynamics of small streams in the Pacific Northwest? The organic matter dynamics of small streams in this region differ from temperate deciduous forests in the nature of the organic matter deposited (protective chemicals, hard epidermis, slower loss rates), the timing of inputs (distributed throughout the year), and the transport rates (smaller, hard needles are more easily transported). The large amount and persistence of wood in these streams provides an additional source of organic matter that can be consumed by particular species and contributes to biofilm and fine particulate organic matter (FPOM) production. Logging is commonly practiced in many forests of the region. This practice has been shown to alter the type, amount, and timing of organic matter delivery to small streams and reduce the amount and size of large wood. Changes in channel complexity and water temperature after logging also can contribute to reduced organic matter storage. Many of the processes controlling organic matter dynamics in small streams are well described in other regions. However, the climate, vegetation, and topography of the Pacific Northwest suggest that the rates and nature of some processes affecting stream organic matter may differ considerably from other regions. Further research on small streams of this area will be required to better understand these differences.
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    MODELING LIGHT ATTENUATION, SECCHI DISK, AND EFFECTS OF TRIPTON IN SENACA RIVER, NEW YORK, USA (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: The development, testing, and application of a probabilistic model framework for the light attenuation coefficient for downwelling irradiance (Kd) and Secchi disc transparency (SD) that resolves the effects of several light attenuating constituents, including phytoplankton and nonliving particles (tripton), is documented. The model is consistent with optical theory, partitioning the magnitudes of the light attenuating processes of absorption and scattering according to the contributions of attenuating constituents as simple summations. The probabilistic framework accommodates variations in the character and concentrations of these constituents and ambient conditions during measurements, and recognizes a linear relationship between the magnitudes of absorption and scattering by tripton. The model is tested and applied for a 21 km reach of the Seneca River, New York, that features optical gradients caused by an intervening hypereutrophic lake and dam, and a severe infestation of the exotic zebra mussel. The model is applied to resolve the roles of phytoplankton and tripton in regulating measured longitudinal patterns of SD along the study reach of the river and increases in SD since the zebra mussel invasion, and to predict decreases in Kd since the invasion.
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    HERBICIDES AND DEGRADATES IN SHALLOW AQUIFERS OF ILLINOIS: SPATIAL AND TEMPORAL TRENDS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : During the fall of 2000, the occurrence was examined of 16 herbicides and 13 herbicide degradates in samples from 55 wells in shallow aquifers underlying grain producing regions of Illinois. Herbicide compounds with concentrations above 0.05 μg/L were detected in 56 percent of the samples. No concentrations exceeded regulatory drinking water standards. The six most frequently detected compounds were degradates. Water age was an important factor in determining vulnerability of ground water to transport of herbicide compounds. Unconsolidated aquifers, which were indicated to generally contain younger ground water than bedrock aquifers, had a higher occurrence of herbicides (73 percent of samples) than bedrock aquifers (22 percent). Temporal analysis to determine if changes in concentrations of selected herbicides and degradates could be observed over a near decadal period indicated a decrease in detection frequency (25 to 18 percent) between samplings in 1991 and 2000. Over this period, significant differences in concentrations were observed for atrazine (decrease) and total acetochlor (increase). The increase in acetochlor compound concentrations corresponds to an increase in acetochlor use during the study period, while the decrease in atrazine concentrations corresponds to relatively consistent use of atrazine. Changes in frequency of herbicide detection and concentration do not appear related to changes in land use near sampled wells.
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    POINT-NONPOINT SOURCE WATER QUALITY TRADING: A CASE STUDY IN THE MINNESOTA RIVER BASIN (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Contrary to the general trend of only a few actual trades occurring within point-nonpoint source water quality trading programs in the United States, two trading projects in the Minnesota River Basin, created under the provisions of National Pollutant Discharge Elimination System (NPDES) permits, have generated five major trades and numerous smaller ones. In this paper, these two projects are described to illustrate their origins, implementation, and results. It was found that several factors contributed to the relatively high number of trades in these projects, including the offsetting nature of the projects (hence a fixed number of credits that the point sources were required to obtain), readily available information on potential nonpoint source trading partners, and an effectively internal trading scheme used by one of the two projects. It was also found that long term structural pollution control measures, such as streambank stabilization, offered substantial cost savings over point source controls. Estimates of transaction costs showed that the total costs of the trading projects were increased by at least 35 percent after transaction costs were taken into account. Evidence also showed that in addition to pollution reduction, these two trading projects brought other benefits to the watershed, such as helping balance environmental protection and regional economic growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03761.x
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    VISITOR VALUES AND LOCAL ECONOMIC IMPACTS OF RIPARIAN HABITAT PRESERVATION: CALIFORNIA'S KERN RIVER PRESERVE (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Preservation of the few remaining ecologically vital riparian areas in the southwestern United States is a significant policy concern. This article reports on two economic aspects of preserving a nationally renowned riparian birding area in Southern California. First, the article examines visitor willingness to pay (WTP) for habitat restoration and estimates an annual WTP of US $77 per visitor to preserve the habitat, about a half-million dollars a year for estimated visitor numbers in 2000 and 2001. Second, it documents visitor expenditures in the local economy to be approximately three-quarters of a million dollars per year. This direct visitor spending attributable to the riparian habitat generates around US $1.3 million in increased local business activity in this relatively remote rural area.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03765.x
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    CLIMATE SCIENCE AND DROUGHT PLANNING: THE ARIZONA EXPERIENCE (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : In response to recent severe drought conditions throughout the state, Arizona recently developed its first drought plan. The Governor's Drought Task Force focused on limiting the economic and social impacts of future droughts through enhanced adaptation and mitigation efforts. The plan was designed to maximize the use of new, scientific breakthroughs in climate monitoring and prediction and in vulnerability assessment. The long term objective of the monitoring system is to allow for evaluation of conditions in multiple sectors and at multiple scales. Stakeholder engagement and decision support are key objectives in reducing Arizona's vulnerability in light of the potential for severe, sustained drought. The drivers of drought conditions in Arizona include the El Nino-Southern Oscillation, the Pacific Decadal Oscillation, and the Atlantic Multidecadal Oscillation.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03747.x
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    DETERMINING MINIMUM FLOWS AND LEVELS: THE FLORIDA EXPERIENCE (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Florida water resources are among the most abundant in the United States, with Florida receiving the second-highest mean annual rainfall of all states. However, water supply issues have troubled the state due to the highly variable spatial and temporal distributions of water supply and demand, and they are aggravated by the population's preference for settling in coastal regions where freshwater resources are scarce. Historically, the competing issues of water resource development and natural systems protection have placed water management agencies and local governments at odds. In 1997, the Florida Legislature enacted several major changes to Florida water law in an attempt to improve water resource planning and protection. This paper briefly reviews the history of water management in Florida with an emphasis on decisions culminating in the 1997 legislation, which requires the development of minimum flows and levels. Also examined is the impact of the 1997 law on water management. Efforts made to comply with legislative mandates are summarized; these include, to date, establishment of minimum flows and levels on 209 water bodies and budgeting in excess of $1.4 billion for water resource development projects.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03712.x
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    ACCOMMODATING CHANGE OF BACTERIAL INDICATORS IN LONG TERM WATER QUALITY DATASETS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : In 1996, the State of Oregon adopted a water quality standard based on Escherichia coli (E. coli), recognizing E. coli as an indicator of pathogenic potential. The Oregon Department of Environmental Quality (DEQ) began analysis for E. coli that same year. The Oregon DEQ continued collection and analysis of fecal coliform (a prior indicator organism) for data input to bacterial loading models and the Oregon Water Quality Index (OWQI). The OWQI is a primary indicator of general water quality for the Oregon DEQ and the Oregon Progress Board. The objective of this study was to develop a regression relationship between fecal coliform and E. coli. This relationship would fill data gaps and extend water quality models and indicators. Water quality policy is better informed by the ability of these extended water quality models to determine whether water quality meets present or would have met past bacterial standards. Monitoring resources spent on dual bacterial analyses could be conserved. This study also showed that changes to OWQI values (as a result of changing bacterial indicators) were minimal, and corresponded to improved characterization of water quality with respect to pathogenic potential.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03716.x
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    INFLUENCES ON RESIDENTIAL YARD CARE AND WATER QUALITY: TUALATIN WATERSHED, OREGON (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The Tualatin is the first watershed in Oregon to implement the Total Maximum Daily Load provisions of the Clean Water Act to deal with nonpoint source pollution. Local officials cite residential yard care practices as potential contributors to nonpoint source pollution in the basin. Qualitative and quantitative methods, including observation of yard maintenance styles, suggest behaviors potentially harmful to water quality and conservation. Yard maintenance is influenced by the importance of neighborhood appearance and concern for aesthetics. These concerns stimulate residents to water, fertilize, and apply weed control at more frequent intervals than yard care experts recommend. Better understanding of the effects that relations with neighbors and yard maintenance knowledge have on residential yard care practices can help improve water quality.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03720.x
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    WATER RESOURCE MANAGEMENT AND DROUGHT FORECASTS IN SOUTH CAROLINA (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Despite potential benefits for resource planning, community water systems managers have not used seasonal climate forecasts extensively. Obstacles to forecast use include a lack of awareness of their existence, distrust of their accuracy, perceived irrelevance to management decisions, and competition from other technological innovations. In this paper, ways in which seasonal forecasts might be extended to address more directly some concerns of South Carolina community water systems managers are explored. From May 1998 through August 2002, this group experienced drought conditions that threatened water quality and supply and required restrictions on water consumption. Methods for incorporating long lead forecasts with joint probabilities of monthly temperature and precipitation to produce drought forecasts are demonstrated. When tailored to specific places, such forecasts show the likelihood of exceeding drought thresholds that would trigger water use restrictions. The methods illustrate how long lead forecasts can be extended and customized into secondary products that address issues of greater relevance to water resource managers.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03724.x
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    CURVE NUMBER HYDROLOGY IN WATER QUALITY MODELING: USES, ABUSES, AND FUTURE DIRECTIONS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Although the curve number method of the Natural Resources Conservation Service has been used as the foundation of the hydrology algorithms in many nonpoint source water quality models, there are significant problematic issues with the way it has been implemented and interpreted that are not generally recognized. This usage is based on misconceptions about the meaning of the runoff value that the method computes, which is a likely fundamental cause of uncertainty in subsequent erosion and pollutant loading predictions dependent on this value. As a result, there are some major limitations on the conclusions and decisions about the effects of management practices on water quality that can be supported with current nonpoint source water quality models. They also cannot supply the detailed quantitative and spatial information needed to address emerging issues. A key prerequisite for improving model predictions is to improve the hydrologic algorithms contained within them. The use of the curve number method is still appropriate for flood hydrograph engineering applications, but more physically based algorithms that simulate all streamflow generating processes are needed for nonpoint source water quality modeling. Spatially distributed hydrologic modeling has tremendous potential in achieving this goal.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03742.x
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    WATER COLUMN LIGHT ATTENUATION IN DANSHUEI RIVER ESTUARY, TAIWAN (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The penetration of sunlight into the water column plays a critical role in the aquatic ecosystem. This study investigates light attenuation through the water column of the Danshuei River estuary and explores the models for quantifying it. The measurement of photosynthetically active radiation (PAR) indicates that the conventional exponential attenuation of light with depth is a very good model. A light attenuation coefficient may be derived from the PAR measurements at each location. The simpler measurements of Secchi depth (SD) provide an approximate estimate of the attenuation coefficients through an inverse linear relationship. The results also reveal that the amount and kinds of materials, which are either dissolved or suspended in the water, control light attenuation through the water column. However, the linear regression with such a model results in very poor correlation, and a relatively large constant term for the Danshuei River estuary. The regression with salinity yields a good correlation, indicating that the fraction of sea water might be a good parameter for estimating light attenuation coefficient for practical application in the Danshuei River estuary.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03746.x
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    EVALUATING HSPF IN AN ARID, URBANIZED WATERSHED (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The Hydrologic Simulation Program-FORTRAN (HSPF) is a powerful time variable hydrologic model that has rarely been applied in arid environments. Here, the performance of HSPF in southern California was assessed, testing its ability to predict annual volume, daily average flow, and hourly flow. The model was parameterized with eight land use categories and physical watershed characteristics. It was calibrated using rainfall and measured flow over a five-year period in a predominantly undeveloped watershed and it was validated using a subsequent 4-year period. The process was repeated in a separate, predominantly urbanized watershed over the same time span. Annual volume predictions correlated well with measured flow in both the undeveloped and developed watersheds. Daily flow predictions correlated well with measured flow following rain events, but predictions were poor during extended dry weather periods in the developed watershed. This modeling difficulty during dry-weather periods reflects the large influence of, and the poor accounting in the model for, artificially introduced water from human activities, such as landscape overwatering, that can be important sources of water in urbanized arid environments. Hourly flow predictions mistimed peak flows, reflecting spatial and temporal heterogeneity of rainfall within the watershed. Model correlation increased considerably when predictions were averaged over longer time periods, reaching an asymptote after an 11-hour averaging window.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03750.x
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    CANOPY COVER AND SHADE DETERMINATIONS IN RIPARIAN ZONES (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Three instruments commonly used to measure stream canopy cover were evaluated: the clinometer, a modified spherical convex densiometer Model A, and a hemispherical image system. The hemispherical image system was also used to model shade. At each of five locations throughout Oregon, canopy cover above a stream was measured from the center of the stream along a series of transects. Vegetation along the reaches sampled ranged from a densely vegetated coastal forest stand to a sparsely vegetated eastern Oregon meadow. When techniques were compared within each site, canopy cover measured with the clinometer was similar to that measured with hemispherical imagery. The densiometer measurements, however, were typically lower than, though still highly correlated with, those derived from hemispherical images and from the clinometer. Because of site-specific factors, the differences between all methods were significant in the Willamette and John Day Provinces. Canopy cover and shade were not equivalent for the streams studied.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03715.x
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    MODELING FLOOD DAMAGE: CASE OF TOKAI FLOOD 2000 (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : In conventional flood damage reduction studies, flood damage is usually estimated with a damage function according to the depth of inundation. However, this method may not reflect the conditions of each family residing in the floodplain because it ignores not only the distribution of flood damage but also the effect of building characteristics and residents' preparedness. This paper uses data from a questionnaire based survey (N= 3,036) conducted 17 months after the Tokai Flood of 2000 that caused disastrous losses to household properties. It provides a conceptual “doughnut structure” model of flood damage to houses and house contents and a mathematical basis for models to explore the determinants of flood damage. Besides the inundation depth, house type significantly affects both the house structural and content damage probabilities, while house ownership and house structure affect house damage probability but not house content damage probability at a given depth. Inundation depth, residing period, and household income significantly affect both house and content damage values. In addition, house ownership has a significant impact on the house damage value, while house structure has an impact on content damage value.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03719.x
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    RUNOFF MODELING OF A MOUNTAINOUS CATCHMENT USING TOPMODEL: A CASE STUDY (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The rainfall-runoff response of the Tygarts Creek Catchment in eastern Kentucky is studied using TOPMODEL, a hydrologic model that simulates runoff at the catchment outlet based on the concepts of saturation excess overland flow and subsurface flow. Unlike the traditional application of this model to continuous rainfall-runoff data, the use of TOPMOEL in single event runoff modeling, specifically floods, is explored here. TOPMODEL utilizes a topographic index as an indicator of the likely spatial distribution of rainfall excess generation in the catchment. The topographic index values within the catchment are determined using the digital terrain analysis procedures in conjunction with digital elevation model (DEM) data. Select parameters in TOPMODEL are calibrated using an iterative procedure to obtain the best-fit runoff hydrograph. The calibrated parameters are the surface transmissivity, TO, the transmissivity decay parameter, m, and the initial moisture deficit in the root zone, Sr0. These parameters are calibrated using three storm events and verified using three additional storm events. Overall, the calibration results obtained in this study are in general agreement with the results documented from previous studies using TOPMODEL. However, the parameter values did not perform well during the verification phase of this study.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03721.x
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    MODELING EFFECTS OF BRUSH MANAGEMENT ON THE RANGELAND WATER BUDGET: EDWARDS PLATEAU, TEXAS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The Soil and Water Assessment Tool (SWAT) was used to evaluate the influence of woody plants on water budgets of semi-arid rangelands in karst terrain. The model was configured for the hydrologic evaluation of the North Fork of the Upper Guadalupe River watershed and was calibrated and verified using measured flow data. Nash and Sutcliffe fit efficiencies for daily and monthly verification periods were 0.09 and 0.50, respectively. Streamflow, baseflow, and evapotranspiration (ET) rates were comparable to published field data. Simulated deep recharge was considerably higher than the published values for the Edwards Plateau. The model was then used to simulate conditions with existing brush cover and four different brush removal scenarios. Scenarios were created to represent existing brush and the removal of brush from only locations that were either covered by heavy brush, were on a moderate slope, or were in shallow soils. Resulting data was compared to previous studies of both field experiments and model simulations. Maximum brush removal resulted in a reduction in ET equal to 31.94 mm/yr depth over the entire basin, or 46.62 mm/yr depth over the treated area. Removal of heavy brush cover resulted in the greatest changes in evapotranspiration, surface runoff, base-flow, and deep recharge. Slope was found to have the greatest effect on lateral subsurface flow.
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    BASE FLOW TRENDS IN URBANIZING WATERSHEDS OF THE DELAWARE RIVER BASIN (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Rapid land development is raising concern regarding the ability of urbanizing watersheds to sustain adequate base flow during periods of drought. Long term streamflow records from unregulated watersheds of the lower to middle Delaware River basin are examined to evaluate the impact of urbanization and imperviousness on base flow. Trends in annual base flow volumes, seven-day low flows, and runoff ratios are determined for six urbanizing watersheds and four reference watersheds across three distinct physiographic regions. Hydrograph separation is used to determine annual base flow and stormflow volumes, and nonparametric trend tests are conducted on the resulting time series. Of the watersheds examined, the expected effects of declining base flow volumes and seven-day low flows and increasing stormflows are seen in only one watershed that is approximately 20 percent impervious and has been subject to a net water export over the past 15 years. Both interbasin transfers and hydrologic mechanisms are invoked to explain these results. The results show that increases in impervious area may not result in measurable reductions in base flow at the watershed scale.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03806.x
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    USING GEOLOGY TO IMPROVE FLOOD HAZARD MANAGEMENT ON ALLUVIAL FANS - AN EXAMPLE FROM LAUGHLIN, NEVADA (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: A study of the piedmont of the Newberry Mountains near Laughlin, Nevada, demonstrates that geologic information can improve the scientific basis of flood-hazard management on alluvial fans in desert areas. Comparison of geologic information against flood insurance rate maps (FIRMs) reveals flaws in conventional methods for flood hazard delineation in this setting. Geologic evidence indicates that large parts of the Newberry piedmont have been isolated from significant flooding for at least the past 10,000 years. This contrasts with existing FIRMs that include large tracts of nonflood prone land in the 100-year and 500-year flood hazard zones and exclude areas of indisputably flood prone land from the regulatory flood plain. From the basis of the geology, flood hazards on at least one-third of the piedmont are mischaracterized on the regulatory maps. The formal incorporation of geologic data into flood hazard studies on desert piedmonts could significantly reduce this type of discrepancy and substantially reduce the scope, hence cost, of more elaborate engineering studies and hazard mitigation strategies. The results of this study affirm the value of new Federal Emergency Management Agency (FEMA) recommendations for characterizing alluvial fan flood hazards and support an argument for mandating geological studies in the regulatory process.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03810.x
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    WATER SHORTAGES, DEVELOPMENT, AND DROUGHT IN ROCKLAND COUNTY, NEW YORK (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Knowledge of the historical variability of regional climate is an essential element of successful water resource planning. Lacking such perspective, planners and managers can be deceived as to the severity of a recent climate extreme, such as drought, and place a disproportionate blame on the climate, not the integrity of the supply system should water restrictions become necessary to avoid shortages. Presented here is a vivid example of how development, a lack of adequate planning, and climate variability have converged to produce three water emergencies in Rockland County, New York, since 1995. An examination of climate data over the past century indicates that the severity of the recent droughts was well within the range of past variability. Rather than climate alone, the recent water emergencies have highlighted a significant mismatch between supply and demand that has been developing in Rockland County over the past three decades. Substantial development, largely in the form of single-family homes, has not been matched with a corresponding enhancement of the county's water system. Realistic plans for meeting current water demand will require cooperation among all stakeholders, beginning with an acknowledgement that climate variations are inevitable, not the sole source of blame when water shortages arise.
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    ESTIMATED IMPACTS OF CLIMATE WARMING ON CALIFORNIA WATER AVAILABILITY UNDER TWELVE FUTURE CLIMATE SCENARIOS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Spatially disaggregated estimates of over 131 stream-flow, ground water, and reservoir evaporation monthly time series in California have been created for 12 different climate warming scenarios for a 72-year period. Such disaggregated hydrologic estimates of multiple hydrologic cycle components are important for impact and adaptation studies of California's water system. A statewide trend of increased winter and spring runoff and decreased summer runoff is identified. Without operations modeling, approximate changes in water availability are estimated for each scenario. Even most scenarios with increased precipitation result in less available water because of the current storage systems' inability to catch increased winter streamflow in compensation for reduced summer runoff. The water availability changes are then compared with estimated changes in urban and agricultural water uses in California between now and 2100. The methods used in this study are relatively simple, but the results are qualitatively consistent with other studies focusing on the hydrologies of single basins or surface water alone.
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    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03783.x
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    SENSITIVITY ANALYSIS, CALIBRATION, AND VALIDATIONS FOR A MULTISITE AND MULTIVARIABLE SWAT MODEL (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: The ability of a watershed model to mimic specified watershed processes is assessed through the calibration and validation process. The Soil and Water Assessment Tool (SWAT) watershed model was implemented in the Beaver Reservoir Watershed of Northwest Arkansas. The objectives were to: (1) provide detailed information on calibrating and applying a multisite and multivariable SWAT model; (2) conduct sensitivity analysis; and (3) perform calibration and validation at three different sites for flow, sediment, total phosphorus (TP), and nitrate-nitrogen (NO3-N) plus nitrite-nitrogen (NO2-N). Relative sensitivity analysis was conducted to identify parameters that most influenced predicted flow, sediment, and nutrient model outputs. A multi objective function was defined that consisted of optimizing three statistics: percent relative error (RE), Nash-Sutcliffe Coefficient (RNS2), and coefficient of determination (R2). This function was used to successfully calibrate and validate a SWAT model of Beaver Reservoir Watershed at multi-sites while considering multivariables. Calibration and validation of the model is a key factor in reducing uncertainty and increasing user confidence in its predictive abilities, which makes the application of the model effective. Information on calibration and validation of multisite, multivariable SWAT models has been provided to assist watershed modelers in developing their models to achieve watershed management goals.
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    ASSESSING SATELLITE-BASED AND AIRCRAFT-BASED THERMAL INFRARED REMOTE SENSING FOR MONITORING PACIFIC NORTHWEST RIVER TEMPERATURE (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
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    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: One central issue affecting the health of native fish species in the Pacific Northwest is water temperature. In situ observation methods monitor point temperatures, while thermal infrared (TIR) remote sensing captures spatial variations. Satellite-based TIR sensors have the ability to view large regions in an instant. Four Pacific Northwest river reaches were selected to test the ability of both satellite-based and moderate resolution aircraft-based TIR remote sensing products to measure river temperatures. Images with resolutions of 5, 15, and 90 meters were compared with instream temperature observations to assess how along stream radiant temperatures are affected by resolution, reach width, and sensor platform. Where the stream reach can be resolved by the sensor, all sensors obtain water temperatures within ±2°C of instream observations. Along stream temperature variations of up to ±5°C were also observed. Trends were similar between two sets of TIR images taken several hours apart, indicating that the sensors are observing actual temperature patterns from the river surface. If sensor resolution is sufficient to obtain fully resolved water pixels in the river reach, accurate temperatures and spatial patterns can be observed. The current generation of satellite-based TIR sensors is, however, only able to resolve about 6 percent of all Washington reaches listed as thermally impaired.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03790.x
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    SPATIAL AND TEMPORAL DYNAMICS OF WOOD IN HEADWATER STREAMS OF THE PACIFIC NORTHWEST (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: This paper synthesizes information on the spatial and temporal dynamics of wood in small streams in the Pacific Northwest region of North America. The literature on this topic is somewhat confused due to a lack of an accepted definition of what constitutes “small” streams and what is the relative size of woody debris contained within the channel. This paper presents a matrix that defines woody debris relative to channel size and then discusses the components of a wood budget. Headwater streams are in close proximity to wood sources and, in steeplands, are often tightly constrained by steep hillslopes. Special consideration is given to ecosystem characteristics and to management practices that affect the wood dynamics in this context. Knowledge gaps and uncertainties that can be used to guide future research are identified. Very little is currently known about the role of mass wasting in wood recruitment and storage relative to other processes, such as bank erosion and mortality, in larger streams. Further, very little work has addressed the relative importance of different wood depletion processes, especially those associated with wood transport. The effect of other ecosystem variables on wood dynamics locally across a watershed (from valley bottom to mountaintop) and regionally across the landscape (from maritime to continental climates) is not addressed. Finally, the scientific community has only begun to deal with the effects of management practices on wood quantity, structure, and movement in small streams.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03776.x
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  • 86
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    DRY AND WET WEATHER FLOW NUTRIENT LOADS FROM A LOS ANGELES WATERSHED (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Effective watershed management requires an accurate assessment of the pollutant loads from the associated point and nonpoint sources. The importance of wet weather flow (WWF) pollutant loads is well known, but in semi-arid regions where urbanization is significant the pollutant load in dry weather flow (DWF) may also be important. This research compares the relative contributions of potential contaminants discharged in DWF and WWF from the Ballona Creek Watershed in Los Angeles, California. Models to predict DWF and WWF loads of total suspended solids, biochemical oxygen demand, nitrate-nitrogen, nitrite-nitrogen, ammonia-nitrogen, total Kjeldahl nitrogen, and total phosphorus from the Ballona Creek Watershed for six water years dating from 1991 to 1996 were developed. The contaminants studied were selected based on data availability and their potential importance in the degradation of Ballona Creek and Santa Monica Bay beneficial uses. Wet weather flow was found to contribute approximately 75 percent to 90 percent of the total annual flow volume discharged by the Ballona Creek Watershed. Pollutant loads are also predominantly due to WWF, but during the dry season, DWF is a more significant contributor. Wet weather flow accounts for 67 to 98 percent of the annual load of the constituents studied. During the dry season, however, the portion attributable to DWF increases to greater than 40 percent for all constituents except biochemical oxygen demand and total suspended solids. When individual catchments within the watershed are considered, the DWF pollutant load from the largest catchment is similar to the WWF pollutant load in two other major catchments. This research indicates WWF is the most significant source of nonpoint source pollution load on an annual basis, but management of the effects of the nonpoint source pollutant load should consider the seasonal importance of DWF.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03780.x
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  • 87
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    INTEGRATING SOCIO-ECONOMIC AND BIOPHYSICAL DATA TO UNDERPIN COLLABORATIVE WATERSHED MANAGEMENT (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Watersheds are widely accepted as a useful geography for organizing natural resource management in Australia and the United States. It is assumed that effective action needs to be underpinned by an understanding of the interactions between people and the environment. While there has been some social research as part of watershed planning, there have been few attempts to integrate socio-economic and biophysical data to improve the efficacy of watershed management. This paper explores that topic. With limited resources for social research, watershed partners in Australia chose to focus on gathering spatially referenced socio-economic data using a mail survey to private landholders that would enable them to identify and refine priority issues, develop and improve communication with private landholders, choose policy options to accomplish watershed targets, and evaluate the achievement of intermediate watershed plan objectives. Experience with seven large watershed projects provides considerable insight about the needs of watershed planners, how to effectively engage them, and how to collect and integrate social data as part of watershed management.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03754.x
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    FLOOD MANAGEMENT IN THE LOWER INCOMATI RIVER BASIN, MOZAMBIQUE: TWO ALTERNATIVES (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The aim of this paper is to compare two views of flood management and thus add to the present thinking of living with floods as opposed to the traditional approach of flood control. The traditional pathway has widely been adopted in developed countries and aims to control floodwaters by means of dams and dikes. The alternative pathway tends towards a policy whereby society lives with the floods by being prepared and having the right damage reduction measures in place. In this paper two pathways are tentatively compared for the Lower Incomati Basin, Mozambique. In the design cultural theory is considered, as is how the design of each path may look according to different management perspectives. The Lower Incomati Basin provides an interesting case study as it is in a relatively undeveloped state. Hence, it is an ideal area for conducting research into the application of alternative flood management strategies. The preliminary results suggest that both pathways are feasible. However, considering recent hydrological extremes such as the 2000 floods, the resilient pathway may ultimately be a more appealing flood management strategy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03758.x
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    AN ANALYSIS OF REGION-OF-INFLUENCE METHODS FOR FLOOD REGIONALIZATION IN THE GULF-ATLANTIC ROLLING PLAINS (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Region-of-influence (RoI) approaches for estimating stream flow characteristics at ungaged sites were applied and evaluated in a case study of the 50-year peak discharge in the Gulf-Atlantic Rolling Plains of the southeastern United States. Linear regression against basin characteristics was performed for each ungaged site considered based on data from a region of influence containing the n closest gages in predictor variable (PRoI) or geographic (GRoI) space. Augmentation of this count based cutoff by a distance based cutoff also was considered. Prediction errors were evaluated for an independent (split-sampled) dataset. For the dataset and metrics considered here: (1) for either PRoI or GRoI, optimal results were found when the simpler count based cutoff, rather than the distance augmented cutoff, was used; (2) GRoI produced lower error than PRoI when applied indiscriminately over the entire study region; (3) PRoI performance improved considerably when Rol was restricted to predefined geographic subregions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03723.x
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    MAPPING REGIONAL PRECIPITATION INTENSITY DURATION FREQUENCY ESTIMATES (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : For regional precipitation frequency analyses, methods are needed to spatially interpolate or smooth point intensity duration frequency (IDF) estimates at gage sites for the purposes of visualization and estimation at ungaged sites. In this study to update IDF estimates for Michigan, the assumption is made that for practical purposes, the entire state may be treated as a homogeneous region in which annual maximum precipitation is identically distributed at each site apart from a site-specific scaling factor, commonly known as the index flood. Several interpolation and smoothing techniques are evaluated for IDF estimation at ungaged sites, including trend surface analysis, thin plate splines, inverse distance weighting, and several kriging algorithms. Ordinary block kriging is recommended as a practical and objective method for smoothing the variability in the index flood values and developing isopluvial maps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03725.x
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    “Urbanization Influences on Aquatic Communities in Northeastern Illinois Streams,” by Faith A. Fitzpatrick, Mitchell A. Harris, Terri L. Arnold, and Kevin D. Richards (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 41 (2005), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2005.tb03730.x
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    Mapping small areas using a low-cost close range photogrammetric software package with aerial photography (2005)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 20 (2005), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Generating maps of small areas using conventional aerial photography is of great interest for small engineering firms. The main problem is the high cost of the sophisticated digital photogrammetric workstations usually employed. In this paper, a low-cost close range photogrammetric software package is used to measure the three-dimensional coordinates of points on the land surface from a photogrammetric flight at a scale of approximately 1:5000. Furthermore, the influence of the type of scanner used to digitise photographs (consumer-grade or photogrammetric scanner), the resolution of the digital images and the number of control points required are examined. The root mean square errors obtained at the check points, using a low-cost close range software package, scanning aerial images with a photogrammetric scanner and 24 ground control points, were around 116 mm for X and Y coordinates, and 191 mm for Z. These levels of accuracy allow the generation of planimetric maps at a scale of 1:1500 and topographic maps with a contour interval of around 1 m. When the images were scanned with a consumer-grade scanner, the root mean square errors were around 150 mm for X and Y, and 271 mm for Z.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.2005.00331.x
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    Rational function model-based image matching for digital elevation models (2005)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 20 (2005), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This paper presents an image matching technique for IKONOS satellite imagery based on rational function models (RFMs). This algorithm adopts the object-space approach and reduces the search space to within the confined line-shaped area called the piecewise matching line (PML). Also, the detailed procedure of generating 3D surface information using the RFM coefficients (RFCs) is introduced to illustrate an end-user's point of view. The final digital elevation model (DEM) generated using the proposed scheme shows a mean error of 2·2 m and rmse of 3·8 m compared with that from a 1:5000 scale digital map.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.2005.00328.x
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    Frontispiece: Early days of electronic computing for surveys and mapping (2005)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 20 (2005), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.2005.00341.x
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    Effects of jpeg 2000 compression on automated dsm extraction: evidence from aerial photographs (2005)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 20 (2005), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This paper evaluates the effects of JPEG 2000 compression on automated digital surface model (DSM) extraction, using the area-based matching technique. Two stereopairs of aerial photographs, which have different photo scale, pixel size, and topographic type, are used as the images for the experiments. In the experiments, the DSM generated from the uncompressed image is set as the reference, and the elevation accuracy is computed for a range of compression ratios (2:1 to 100:1). The results show that the employed indices of image quality based on the JPEG 2000 compression are clearly superior to the commonly used JPEG compression technique—especially for high compression ratios. However, the elevation accuracy varies with the compression ratios. Also, JPEG 2000 compression does not have a significant influence on the percentage of the successful matching rate. In addition, a near linear fall-off is observed in extracted DSM accuracy with increasing compression ratios.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.2005.00330.x
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    Editorial (2005)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 20 (2005), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.2005.00342.x
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    GIS for coastal zone management (2005)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 20 (2005), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.2005.00343_2.x
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    Manual of photogrammetry (2005)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 20 (2005), S. 0 
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    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.2005.00343_1.x
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    Geographic information systems for transportation—principles and applications (2005)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 20 (2005), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.2005.00343_3.x
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    Photopolarimetry in remote sensing (2005)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 20 (2005), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.2005.00343_4.x
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