Sensitivity Analysis Of Hydrological Parameters In Modeling FlowAnd Transport In The Unsaturated Zone Of Yucca Mountain

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The unsaturated fractured volcanic deposits at Yucca Mountain in Nevada, USA, have been intensively investigated as a possible repository site for storing high-level radioactive waste. Field studies at the site have revealed that there exist large variabilities in hydrological parameters over the spatial domain of the mountain. Systematic analyses of hydrological parameters using a site-scale three-dimensional unsaturated zone (UZ) flow model have been undertaken. The main objective of the sensitivity analyses was to evaluate the effects of uncertainties in hydrologic parameters on modeled UZ flow and contaminant transport results. Sensitivity analyses were carried out relative to fracture and matrix permeability ... continued below

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Zhang, Keni; Wu, Yu-Shu & Houseworth, James E February 1, 2006.

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The unsaturated fractured volcanic deposits at Yucca Mountain in Nevada, USA, have been intensively investigated as a possible repository site for storing high-level radioactive waste. Field studies at the site have revealed that there exist large variabilities in hydrological parameters over the spatial domain of the mountain. Systematic analyses of hydrological parameters using a site-scale three-dimensional unsaturated zone (UZ) flow model have been undertaken. The main objective of the sensitivity analyses was to evaluate the effects of uncertainties in hydrologic parameters on modeled UZ flow and contaminant transport results. Sensitivity analyses were carried out relative to fracture and matrix permeability and capillary strength (van Genuchten {alpha}) through variation of these parameter values by one standard deviation from the base-case values. The parameter variation resulted in eight parameter sets. Modeling results for the eight UZ flow sensitivity cases have been compared with field observed data and simulation results from the base-case model. The effects of parameter uncertainties on the flow fields were evaluated through comparison of results for flow and transport. In general, this study shows that uncertainties in matrix parameters cause larger uncertainty in simulated moisture flux than corresponding uncertainties in fracture properties for unsaturated flow through heterogeneous fractured rock.

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  • Journal Name: Hydrogeology Journal; Journal Volume: 14; Journal Issue: 8; Related Information: Journal Publication Date: 12/2006

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  • Report No.: LBNL--59819
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1007/s10040-006-0055-y | External Link
  • Office of Scientific & Technical Information Report Number: 919755
  • Archival Resource Key: ark:/67531/metadc902202

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • February 1, 2006

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 29, 2016, 6:59 p.m.

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Zhang, Keni; Wu, Yu-Shu & Houseworth, James E. Sensitivity Analysis Of Hydrological Parameters In Modeling FlowAnd Transport In The Unsaturated Zone Of Yucca Mountain, article, February 1, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc902202/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.