An Estimated Potentiometric Surface of the Death Valley Region, Nevada and California, Developed Using Geographic Information System and Automated Interpolation Techniques PDF Download
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Author: Frank A. D'Agnese
Publisher:
ISBN:
Category : Geographic information systems
Languages : en
Pages : 28
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Author: Frank A. D'Agnese
Publisher:
ISBN:
Category : Geographic information systems
Languages : en
Pages : 28
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Book Description
Author: Frank A. D'Agnese
Publisher:
ISBN:
Category : Geographic information systems
Languages : en
Pages : 15
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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An estimated potentiometric surface was constructed for the Death Valley region, Nevada and California, from numerous, disparate data sets. The potentiometric surface was required for conceptualization of the ground-water flow system and for construction of a numerical model to aid in the regional characterization for the Yucca Mountain repository. Because accurate, manual extrapolation of potentiometric levels over large distances is difficult, a geographic-information-system method was developed to incorporate available data and apply hydrogeologic rules during contour construction. Altitudes of lakes, springs, and wetlands, interpreted as areas where the potentiometric surface intercepts the land surface, were combined with water levels from well data. Because interpreted ground-water recharge and discharge areas commonly coincide with groundwater basin boundaries, these areas also were used to constrain a gridding algorithm and to appropriately place local maxima and minima in the potentiometric-surface map. The resulting initial potentiometric surface was examined to define areas where the algorithm incorrectly extrapolated the potentiometric surface above the land surface. A map of low-permeability rocks overlaid on the potentiometric surface also indicated areas that required editing based on hydrogeologic reasoning. An interactive editor was used to adjust generated contours to better represent the natural water table conditions, such as large hydraulic gradients and troughs, or ''vees''. The resulting estimated potentiometric-surface map agreed well with previously constructed maps. Potentiometric-surface characteristics including potentiometric-surface mounds and depressions, surface troughs, and large hydraulic gradients were described.
Author: Frank A. D'Agnese, Claudia C. Faunt and A. Keith Turner
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Author: Claudia C. Faunt
Publisher:
ISBN:
Category : Geographic information systems
Languages : en
Pages : 28
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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In support of Yucca Mountain site characterization studies, a hydrogeologic framework was developed, and a hydrogeologic map was constructed for the Death Valley region. The region, covering approximately 100,000 km2 along the Nevada-California border near Las Vegas, is characterized by isolated mountain ranges juxtaposed against broad, alluvium-filled valleys. Geologic conditions are typical of the Basin and Range Province; a variety of sedimentary and igneous intrusive and extrusive rocks have been subjected to both compressional and extensional deformation. The regional ground-water flow system can best be described as a series of connected intermontane basins in which ground-water flow occurs in basin-fill deposits, carbonate rocks, clastic rocks, and volcanic rocks. Previous investigations have developed more site-specific hydrogeologic relationships; however, few have described all the lithologies within the Death Valley regional ground-water flow system. Information required to characterize the hydrogeologic units in the region was obtained from regional geologic maps and reports. Map data were digitized from regional geologic maps and combined into a composite map using a geographic information system. This map was simplified to show 10 laterally extensive hydrogeologic units with distinct hydrologic properties. The hydraulic conductivity values for the hydrogeologic units range over 15 orders of magnitude due to the variability in burial depth and degree of fracturing.
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 400
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Author: Claudia C. Faunt
Publisher:
ISBN:
Category : Geographic information systems
Languages : en
Pages : 18
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Author:
Publisher: DIANE Publishing
ISBN: 1428917357
Category :
Languages : en
Pages : 34
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