Evolution of the unsaturated zone testing at Yucca Mountain
The evaluation of the Yucca Mountain site has evolved from intensive surface based investigations in the early 1980s to current focus on testing in underground drifts. Different periods of site-characterization activities and prominent issues concerning the unsaturated zone are summarized. Data-collection activities have evolved from mapping of faults and fractures, to estimation of percolation through tuff layers, and to quantification of seepage into drifts. Evaluation of discrete flow paths in drifts has led to fracture-matrix interaction and matrix diffusion tests over different scales. The effects of tuff interfaces and local faults are evaluated in fractured-welded and porous-nonwelded units. Mobilization of matrix water and redistribution of moisture are measured in thermal tests. Lessons learned from underground tests are used to focus on processes needed for additional quantification. Migration through the drift shadow zone and liquid flow through faults are two important issues that have evolved from current knowledge.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Civilian Radioactive Waste Management. Yucca Mountain Site Characterization Office (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 840323
- Report Number(s):
- LBNL-49876; R&D Project: 81BB11; TRN: US0501964
- Journal Information:
- Journal of Contaminant Hydrology, Vol. 62-63, Issue SI; Other Information: Submitted to Journal of Contaminant Hydrology: Volume 62-63, Special Issue; Journal Publication Date: 04-05/2003; PBD: 1 Sep 2002
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
DIFFUSION
EVALUATION
FRACTURES
LIQUID FLOW
MOISTURE
SITE CHARACTERIZATION
TESTING
TUFF
WATER
YUCCA MOUNTAIN
SEEPAGE FRACTURE FLOW FRACTURE-MATRIX INTERACTION MATRIX DIFFUSION PERCOLATION FLOW AND TRANSPORT UNSATURATED ZONE YUCCA MOUNTAIN.