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Characterization of Spatial Variability of Hydrogeologic Properties for Unsaturated Flow in the Fractured Rocks at Yucca Mountain, Nevada [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Civilian Radioactive Waste Management, 2002.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
vp : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy. Office of Civilian Radioactive Waste Management, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The spatial variability of layer-scale hydrogeologic properties of the unsaturated zone (UZ) at Yucca Mountain, Nevada, is investigated using inverse modeling. The thick UZ is grouped into five hydrostratigraphic units and further into 35 hydrogeologic layers. For each layer, lateral variability is represented by the variations in calibrated values of layer-scale properties at different individual deep boreholes. In the calibration model, matrix and fracture properties are calibrated for the one-dimensional vertical column at each individual borehole using the ITOUGH2 code. The objective function is the summation of the weighted misfits between the ambient unsaturated flow (represented by measured state variables: water saturation, water potential, and pneumatic pressure) and the simulated one in the one-dimensional flow system. The objective function also includes the weighted misfits between the calibrated properties and their prior information. Layer-scale state variables and prior rock properties are obtained from their core-scale measurements. Because of limited data, the lateral variability of three most sensitive properties (matrix permeability, matrix of the van Genuchten characterization, and fracture permeability) is calibrated, while all other properties are fixed at their calibrated layer-averaged values. Considerable lateral variability of hydrogeologic properties is obtained. For example, the lateral variability of is two to three orders of magnitude and that of and is one order of magnitude. The effect of lateral variability on site-scale flow and transport will be investigated in a future study.
Report Numbers
E 1.99:lbnl--50505
lbnl--50505
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Other Subject(s)
Note
Published through SciTech Connect.
05/21/2002.
"lbnl--50505"
International Groundwater Symposium on Bridging the Gap Between Measurements and Modeling in Heterogeneous Media, Berkeley, CA (US), 03/25/2002--03/28/2002.
Oldenburg, Curtis M.; Bodvarsson, Gudmundur S.; Zhou, Quanlin; Liu, Hui-Hai.
Funding Information
AC03-76SF00098
465103
View MARC record | catkey: 14379733