EFFECTS OF FAULTED STRATIGRAPHY ON SATURATED ZONE FLOW BENEATH YUCCA MOUNTAIN, NEVADA

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The S{sup 4}Z Model (''sub-site-scale saturated zone'') is a 3-D TOUGH2 model that was developed to study the saturated zone (SZ) at Yucca Mountain, Nevada, and to aid in the design and analysis of hydrologic tests. Yucca Mountain is the proposed site for a nuclear waste repository for the United States. The model covers an area of approximately 100 km{sup 2} around Yucca Mountain, as shown in Figure 1. The proposed repository is located in the unsaturated zone, immediately above the area of equidimensional gridblocks east of Solitario Canyon fault, which defines the crest of Yucca Mountain. The finely discretized ... continued below

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OLDENBURG, ANDREW J.B. COHEN AND CURTIS M. July 29, 1999.

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Description

The S{sup 4}Z Model (''sub-site-scale saturated zone'') is a 3-D TOUGH2 model that was developed to study the saturated zone (SZ) at Yucca Mountain, Nevada, and to aid in the design and analysis of hydrologic tests. Yucca Mountain is the proposed site for a nuclear waste repository for the United States. The model covers an area of approximately 100 km{sup 2} around Yucca Mountain, as shown in Figure 1. The proposed repository is located in the unsaturated zone, immediately above the area of equidimensional gridblocks east of Solitario Canyon fault, which defines the crest of Yucca Mountain. The finely discretized region near the center of the domain corresponds to the area near a cluster of boreholes used for hydraulic and tracer testing. This discretization facilitates simulation of tests conducted there. The hydrogeologic structure beneath the mountain is comprised of dipping geologic units of variable thickness which are offset by faults. One of the primary objectives of the S{sup 4}Z modeling effort is to study the potential effects of the faulted structure on flow. Therefore, replication of the geologic structure in the model mesh is necessary. This paper summarizes (1) the mesh discretization used to capture the faulted geologic structure, and (2) a model simulation that illustrates the significance of the geologic structure on SZ flow and the resulting macrodispersion.

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  • Report No.: MOL.19990318.0151
  • Grant Number: DE-AC01-91RW00134
  • Office of Scientific & Technical Information Report Number: 778899
  • Archival Resource Key: ark:/67531/metadc725425

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  • July 29, 1999

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  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 10, 2016, 7:29 p.m.

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OLDENBURG, ANDREW J.B. COHEN AND CURTIS M. EFFECTS OF FAULTED STRATIGRAPHY ON SATURATED ZONE FLOW BENEATH YUCCA MOUNTAIN, NEVADA, report, July 29, 1999; Las Vegas, Nevada. (digital.library.unt.edu/ark:/67531/metadc725425/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.