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  • Articles  (36,476)
  • 1975-1979  (36,476)
  • Energy, Environment Protection, Nuclear Power Engineering  (36,476)
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  • Articles  (36,476)
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  • 1
    Electronic Resource
    Electronic Resource
    Shortest Path Problems in Hydrogeology (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Many aspects of ground water involve shortest paths between two points and shortest round trips to many points. These problems are included in network theory which is not easily available to ground-water specialists. This paper introduces some of the techniques which can be solved by hand for fairly small projects. Larger networks can often be divided into districts, each of which may then be amenable to hand solution.The minimal spanning tree problem is described as background to the more useful problem of shortest path between two particular nodes. The matrix method is the simplest solution for the shortest path between all pairs of nodes and can easily be solved by hand for 30 or less nodes. This data can be used to determine which node is most centrally located and to determine a shorter round trip from one node to all others, returning to the origin. The matrix can be used for partial routes and for routing of two or more vehicles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1978.tb03246.x
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  • 2
    Electronic Resource
    Electronic Resource
    Detection of Permeability Variations by a Shallow Geothermal Technique (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: During a seven-month sampling period surface-water, ground-water, and shallow subsurface temperatures were measured at a well field in the Coastal Plain province in southeastern Pennsylvania in an attempt to delineate zones of relatively greater permeability in the underlying glacial outwash materials. Temperature measurements were made at monthly intervals using a tele-thermometer equipped with a thermistor. Subsurface temperatures were taken at a depth of six feet (183 cm) in a network of 66 access holes.In order to recognize perturbations in the subsurface thermal regime, theoretical conductive heat flow calculation: of the temperature variation expected to occur at a depth of six feet (183 cm) were compared to the observed temperature variation measured in the network of access holes. Isothermal maps, contouring equal temperatures at a specific time, and isallothermal maps, contouring equal temperature changes in a specific time interval, were constructed from the access hole data. These maps facilitated the identification of areas not conforming to the predicted value of annual subsurface temperature variation.Anomalous areas were found to represent regions where differing land-use practices or ground-water movement perturbed the normal thermal regime. Access hole temperatures measured in areas not covered by a dense vegetative cover or a tree canopy were found to have greater temperature variation than predicted. Areas where the temperature variation in the access holes was less than predicted were found to overlie known zones of relatively greater permeability in the underlying materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1978.tb03233.x
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  • 3
    Electronic Resource
    Electronic Resource
    Ground-Water Lake Relationships and Ground-Water Quality in the Sand Plain Province of Wisconsin—Nepco Lake (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Nepco Lake is a 494-acre impoundment in the sand plain province of central Wisconsin, an area characterized by a close relationship between ground water and surface water. A study of the ground-water flow pattern and ground-water quality in the vicinity of Nepco Lake was conducted for an 11-month period from June 1976 to April 1977.The ground-water flow system around Nepco Lake is different from systems for natural lakes previously reported in the literature, in that there are no strong vertical head gradients in the nearshore areas. This phenomenon may be typical for impounded lakes. Other aspects of the study included a survey of the water quality within the watershed and the calculation of water budgets for the lake. Variations in water quality can be related to changes in the texture of the aquifer or the nature of the flow system or both. Water budget calculations indicate that direct ground-water discharge into the lake is relatively small compared to surface-water contributions. Nevertheless, ground water in the Nepco Lake Watershed should be carefully managed because of the close relationship between ground water and surface water in this area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1978.tb03235.x
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  • 4
    Electronic Resource
    Electronic Resource
    Scavenging of Chromium and Cadmium by Aquifer Material — South Farmingdale-Massapequa Area, Long Island, New York (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: A plume of ground water enriched by liquid metal-plating effluent has formed downgradient from an industrial park in southeast Nassau County, New York. Discharges from the plant to the shallow aquifer began in the 1940's and continue to the present.Core samples of aquifer material from the plume were analyzed by oxalate extraction and dithionite-citrate-bicarbonate (DCB) extraction methods for the presence of chromium and cadmium. Results of the extraction indicate that for 1 kilogram of soil, the median concentrations of extracted chromium and cadmium in aquifer material are 7.5 and 1.1 milligrams, respectively, and the maximum concentrations are 19 and 2.3 milligrams, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1978.tb03210.x
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  • 5
    Electronic Resource
    Electronic Resource
    Flow to a Nonpenetrating Well in a Leaky Artesian Aquifer with Variable Discharge (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: A differential equation for axisymmetric radial transient flow to a nonpenetrating well in an infinite leaky aquifer in spherical coordinate system has been formulated. A general solution for nonsteady-state flow was obtained for nonpenetrating wells in leaky artesian aquifers with a general time variable discharge function, as well as for the specific case of exponential decay discharge function. The solution is expressed in terms of standard mathematical functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1978.tb03211.x
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  • 6
    Electronic Resource
    Electronic Resource
    REPLY TO the Discussion by Robert K. Gabrysch and Thomas L. Hotzer of “Fault Control of Subsidence, Houston, Texas,” January-February 1978, pp. 51–55 (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1978.tb03212.x
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  • 7
    Electronic Resource
    Electronic Resource
    MEETING CALENDAR (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1978.tb03213.x
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  • 8
    Electronic Resource
    Electronic Resource
    Cyclic Storage, Where Are You Now? (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: This paper presents ten theses summarizing: The cyclic pattern of precipitation and runoff in the Central Valley of California and the need for cyclic storage to insure regularity and continuity in water supply; the inadequacy of surface-water storage because of evaporation losses and probable interference with ground-water recharge; the blasted hopes of Federal and State water agencies for control and management of the ground-water reservoir, because of potential conflict with private property rights; the artificial recharge by private and local enterprise; increasing emphasis in Federal and State programs upon surface reservoirs at increasing cost in money and water; the tendency of Federal policy to focus on the needs and clamors for irrigation water, with subsidies; and the availability of water from Federal projects now under construction for artificial recharge and subsurface storage, a first step to a long-range program of cyclic storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1978.tb03198.x
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  • 9
    Electronic Resource
    Electronic Resource
    Application of a Mathematical Model to Estimate Water Levels (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: A mathematical model for estimating daily water levels from less than daily observations was used to analyze an existing water-level observation network on Cape Cod, Massachusetts. The model assumes that the water-level fluctuation curve can be approximated by a simple harmonic function of the form: wl(x)=M+A cos(2π/T×+ C) + Bx where wl(x) is the water level for day number x. M, A, C and B are constants, and T is the harmonic period.The analysis indicated that for those sites which are not affected by tidal fluctuations or man-made influences (such as pumping), six water-level measurements per year would allow daily water levels to be interpolated with a standard error of estimate of about 0.06 meters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1978.tb03199.x
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  • 10
    Electronic Resource
    Electronic Resource
    DISCUSSION OF “Fault Control of Subsidence, Houston, Texas,” by Charles W. Kreitler, May-June 1977 issue, v. 15, no. 3, pp. 203–214 (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1978.tb03203.x
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