Laczniak, R J

2 items:

Tectonic, climatic, and land-use controls on groundwater recharge in an arid alluvial basin: Amargosa Desert, U.S.A. Unsaturated-zone profiles in alluvial sediments of the Amargosa Desert reveal distinct patterns of groundwater recharge corresponding to tectono-geomorphic setting and land-use history. Profiles of water potential, water content, and solute concentrations beneath irrigated fields, undisturbed native vegetation, and the normally dry channel of the Amargosa River reflect strongly contrasting recharge regimes. Profiles beneath irrigated fields and channel sites indicate quasi-steady percolation at depths sufficient to be isolated from seasonal variations in meteorologic forcing. Displaced chloride and nitrate peaks beneath a recently converted agricultural field and a weakly incised channel site capture newly initiated... Categories: Publication; Types: Citation
Ground-Water Modeling of the Death Valley Region, Nevada and California The Death Valley regional ground-water flow system (DVRFS) of southern Nevada and eastern California covers an area of about 100,000 square kilometers and contains very complex geology and hydrology. Using a computer model to represent the complex system, the U.S. Geological Survey simulated ground-water flow in the Death Valley region for use with U.S. Department of Energy projects in southern Nevada. The model was created to help address contaminant cleanup activities associated with the underground nuclear testing conducted from 1951 to 1992 at the Nevada Test Site and to support the licensing process for the proposed geologic repository for high-level nuclear waste at Yucca Mountain, Nevada. Categories: Publication; Types: Citation

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