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Evaluation of Geophysical Surface Methods for Measuring Hydrological Variables in Fractured Rock Units.

Authors
Taylor-RW
Source
NTIS: PB/84-158021 :146 pages
Link
NIOSHTIC No.
10003375
Abstract
A simplified theoretical model for the use of electrical resistivity measurements to determine joint orientation and intensity was developed. A field procedure based on the theoretical model was applied to a physical model under laboratory conditions and at two field sites. The two field sites were identical geologically but differed in that one site was intensely mined while the other was unmined. In all three cases, joint strike was determined within approximately 5 degrees and the relative indications of joint intensity were correct. In addition to the electrical measurements, the anisotrophy associated with seismic velocity and attenuation was measured at each field site. The seismic measurements, in comparison with the electrical measurements, were much less informative and more difficult to interpret. A computer-automated system for the continuous monitoring of resistivity depth soundings was deployed at one of the sites. Continuous 48-h monitoring following a rainfall suggested that the downward movement of water could be detected.
Publication Date
19820101
Document Type
CP; Final Contract Report;
Fiscal Year
1982
NTIS Accession No.
PB84-158021
NTIS Price
A08
Identifying No.
OFR 17-84
NIOSH Division
TCRC;
Source Name
NTIS: PB/84-158021
State
WI;
Performing Organization
University of Wisconsin
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