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  • 1
    Monograph available for loan
    Monograph available for loan
    Wallingford : IAHS Press
    Associated volumes
    Call number: M 10.0312
    In: Benchmark papers in hydrology
    Type of Medium: Monograph available for loan
    Pages: 506 S.
    ISBN: 9781907161063
    Series Statement: Benchmark papers in hydrology 4
    Classification:
    Hydrology
    Note: Erscheinungsjahr in Vorlageform:2010
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Call number: S 90.0002(1645)
    In: Professional paper
    Type of Medium: Series available for loan
    Pages: 21 S.
    ISBN: 0607978090
    Series Statement: U.S. Geological Survey professional paper 1645
    Classification:
    Applied Geology
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 14 (1990), S. 149-150 
    ISSN: 1432-1009
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 27 (1991), S. 0 
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The concept of a space-time tradeoff is extended to the hydrologic data sets of competing rainfall-runoff modeling techniques. Examples are given by comparing the performance of a regression model and a quasi-physically based model using data from an experimental catchment and data synthetically generated. Space-time tradeoffs are demonstrated within the data sets of the two modeling techniques, but not across the competing hydrologic data sets.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 28 (1992), S. 0 
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : In this paper a new set of soil texture data is used to estimate the spatial distribution of saturated hydraulic conductivity values for a small rangeland catchment. The estimates of conductivity are used to re-excite and re-evaluate a quasi-physically based rainfall-runoff model. The performance of the model is significantly reduced with conductivity estimates gleaned from soil texture data rather than the infiltration data used in our previous efforts.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 26 (1990), S. 0 
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : A successful procedure for measuring steady-state infiltration rates at remote locations is described. The equipment for the simultaneous experiments is of simple design, inexpensive, and rugged. A total of 247 steady-state infiltration measurements were made across a small rangeland catchment using the procedure as described. The reason for the measurements was to characterize the spatial variability of infiltration across the catchment. The limiting factor for the multiple-ring system as employed in this study was a sufficient water supply to conduct the experiments to completion.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 32 (1994), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Nonpoint source ground-water contamination, resulting from regional scale applications of agrichemicals, is a major environmental issue. Several federal and state government funded modeling efforts were undertaken in the 1980s to assess ground-water vulnerability from past and current chemical use and to potentially aid in the regulation of new chemicals. This paper is concerned with the impact of data uncertainties in regional scale pesticide leaching assessments for the chemical diuron in the Pearl Harbor Basin on the Hawaiian island of Oahu. In the first part of the paper uncertainties in soil, recharge, and chemical data are artificially reduced to study the impact of reduced data uncertainties on ground-water vulnerability assessments made with simple mobility indices; the greatest improvements were realized for improvements in the chemical data. In the second part of the paper the impact of improvements to the Hawaii soil data, in the form of new soil organic carbon information, is characterized relative to changes in ground-water vulnerability assessments made with a simple index. The additional soil organic carbon data does not yield improvements to the original vulnerability assessment that would be considered justifiable. The best use of regional scale chemical leaching assessments based upon modeling approaches as simple as index methods is for guiding data collection strategies.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: This paper is the second part of a two-part series concerned with assessing the potential for organic chemical leaching to a ground-water skimming tunnel in the Pearl Harbor Basin, Oahu, Hawaii, as a direct result of proposed urban development. The Pesticide Root Zone Model (PRZM) was used, after testing with field and laboratory data described in the companion paper, to make long-term predictions of the movement of chlorpyrifos, diazinon, metribuzin, and nitrate under various recharge scenarios. The PRZM simulations revealed that, with the exception of chlorpyrifos, detectable levels of all the chemicals considered in this study may leach through the unsaturated zone to the water table from where they may eventually migrate to the skimming tunnel. The simulated concentrations in leachate reaching the water table were sufficiently low, considering subsequent mixing in the ground water, to suggest no adverse health effects. The reliability of the simulated results are laced with enough uncertainty, however, to suggest the need for monitoring for diazinon, metribuzin, and nitrate, if development does proceed. The methodology presented in this series is a first attempt at establishing a protocol for using numerical modeling, supported by field and laboratory measurements to aid in land-use change consideration in Hawaii when nonpoint ground-water contamination from organic chemicals is of concern.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: This paper is the first paper of a two-part series concerned with assessing the potential for organic chemical leaching to a ground-water skimming tunnel in the Pearl Harbor Basin, Oahu, Hawaii as a direct result of a proposed urban development. The objective of our simulation-based assessment was to provide insight into the potential for chemicals, that may be introduced to the recharge areas of the Waiawa Shaft as a result of the proposed developments, to subsequently leach through the unsaturated zone to ground water. In this paper field and laboratory results are presented for experiments designed to support the modeling effort reported in the second paper of this series. The chemical leaching experiments were conducted at two field locations. The chemicals which were applied and then monitored for their downward movement in the near-surface unsaturated zone are bromide, chlorpyrifos and fenamiphos. We found (1) good mass balance for bromide at both sites, (2) limited mobility of chlorpyrifos and fenamiphos at the field plots, and (3) good agreement between field and laboratory measured degradation rates.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 36 (2000), S. 0 
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Agriculture is the leading cause of regional-scale non-point source (NPS) pollution in the world today. Indices of pesticide leaching in the vadose zone are well suited for estimating the spatial accumulation and distribution of NPS pollutants in the near surface. In this study the Attenuation Factor (AF) and the Leaching index (Li) are used to assess the near-surface leaching potential for 32 important agrochemicals for world average agricultural soil properties and recharge rates. The AF and Li indices both require the same input data and appear to work well for nonpolar chemicals. In the effort reported here the AF and Li indices produced similar results for the 32 agrochemicals. Pesticides with high and moderate leaching potential are identified. The AF estimates were more constant than the Li estimates for changes in the compliance depth and recharge rate. The AF index is simpler to use than the Li index and, therefore, is more likely to be employed in the future for screening/ranking agrochemicals relative to regional-scale NPS ground water vulnerability.
    Type of Medium: Electronic Resource
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