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Electrical Resistance Tomography Of Unsaturated Flow And Transport In Yucca MountainNormal access

Authors: Michael Buettner, William Daily, Abe Ramirez and Gilles Bussod
Event name: 12th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Hydrology Forum - Geophysical Applications In Hydrologic Mapping
Publication date: 14 March 1999
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 995.05Kb )

Electrical Resistance Tomography (ERT), a new geophysical imaging technique, was used to study
the movement of a tracer through the test block at the Unsaturated Zone Transport Test (UZTT) at
Busted Butte, Nevada. Data were collected four times starting in July and ending in early
September, 1998. ERT baseline images show a resistivity structure which is consistent with the
known lithology in the rear part of the test block. There appears to be a low resistivity region in
the front half of the block, particularly near the bottom. Difference images from August 19 and
September 9 show clear and consistent resistivity decreases in the region near injection holes 18,
20, and 21 which can be associated with the injection of conductive water. The images show very
little effect in the region around the other injection holes, 23, and 24 through 27 where far less
water was injected. Difference images from August 19 and September 9 show resistivity decreases
which could be interpreted as water moving down into the block. This is the same region which
has an anomalously low resistivity in the baseline image. These results should be considered
preliminary, and are subject to further interpretation.

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