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The AAPG/Datapages Combined Publications Database
Environmental Geosciences (DEG)
Abstract
Using Mise-à-la-Masse to Delineate the Migration of a Conductive Tracer in Partially Saturated Basalt
Department of Geological Sciences, University of Idaho, Moscow, ID 83844-3022
Robin Nimmer received a Bachelor of Science degree in Geology from the University of Wisconsin-Milwaukee and a Master of Science degree in hydrology from the University of Idaho. She currently is working on a Ph.D. in Geology from the University of Idaho. Robin's research interests include groundwater contamination and remediation and the use of geophysics as a hydrologic tool.
James L. Osiensky has been a Hydrogeology faculty member for the University of Idaho since 1988. Osiensky's current research interests include, the application of hydrogeophysics to environmental problems, point and non-point source ground water contamination, ground water resource evaluation, aquifer testing in heterogeneous environments, and ground water modeling.
ABSTRACT
solution
of potassium chloride
was injected continuously above a perched water table at an average rate of
10 L/day under a constant hydraulic head for 34 days. An asymmetrical groundwater
mound developed over time during which electrical potential measurements were
taken to delineate migration of the tracer. A 15 by 15 array of porous pot electrodes
(copper sulfate), located symmetrically about the centrally located injection
well, was used for the borehole-surface MALM. Ratios of electrical potentials/baseline
were contoured over time to delineate anomalies caused by the presence of tracer
solution
in the fractured basalt. Borehole-surface measurements delineated the
lateral migration of tracer over time and presence of clay filled fractures.
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