Fault-matrix interactions in nonwelded tuff of the Paintbrush Group at Yucca Mountain

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doi: 10.1016/S0169-7722(02)00165-1
Authors:Salve, Rohit; Oldenburg, Curtis M.; Wang, Joseph S. Y.
Author Affiliations:Primary:
E. O. Lawrence Berkeley National Laboratory, Earth Sciences Division, Berkeley, CA, United States
Other:
Sandia National Laboratories, United States
Los Alamos National Laboratory, United States
Volume Title:Yucca Mountain Project
Volume Authors:Bodvarsson, Gudmundur S., editor; Ho, Clifford K.; Robinson, Bruce A.
Source:Yucca Mountain Project, edited by Gudmundur S. Bodvarsson, Clifford K. Ho and Bruce A. Robinson. Journal of Contaminant Hydrology, Vol.62-63, p.269-286. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0169-7722
Publication Date:2003
Note:In English. 35 refs.; illus., incl. 2 tables
Summary:To investigate the potential for fast flow through altered tuff of the nonwelded unit of the Paintbrush Group (PTn) at Yucca Mountain, Nevada, we carried out in situ field experiments using water released directly into the matrix and along a minor subvertical normal fault at Alcove 4 in the Exploratory Studies Facility (ESF). During the experiments, changes in moisture content were monitored within the test bed, and a slot excavated below the test bed was visually inspected for seepage. Our field tests suggest that the dry porous PTn matrix is capable of attenuating episodic percolation fluxes in localized areas (such as around faults) where fast flow would be expected to dominate. Once wetted, the matrix is able to retain the moisture over a period of months. As saturation increases in the matrix, less water imbibes along the fault and more water travels farther along the fault. From this observation, we infer that a sequence of infiltration events separated by periods of up to a few months could convey water over increasing distances along the fault. Abstract Copyright (2003) Elsevier, B.V.
Subjects:Aquifers; Cenozoic; Experimental studies; Fluid dynamics; Ground water; Igneous rocks; Matrix; Miocene; Moisture; Neogene; Paintbrush Tuff; Permeability; Porous materials; Preferential flow; Pyroclastics; Recharge; Reservoir rocks; Site exploration; Tertiary; Theoretical models; Tiva Canyon Member; Topopah Spring Member; Unsaturated zone; Volcanic rocks; Waste disposal; Welded tuff; Nevada; Nye County Nevada; United States; Yucca Mountain
Coordinates:N364400 N370000 W1162500 W1163500
Record ID:2003053459
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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