Electrical resistivity investigation of potential cavities underlying a proposed ash disposal area |
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| Authors: | Barbara J Denahan Douglas L Smith |
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| Institution: | (1) Environmental Science and Engineering, Inc, 32602 Gainesville, Florida;(2) Department of Geology, University of Florida, 32611 Gainesville, Florida |
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| Abstract: | Measurements of electrical resistivity anomalies using a Wenner electrode array in a profiling mode were conducted over a
105-acre area near Crystal River, Florida Analyzed results of collected data were used to determine the likelihood of subsurface
solution cavities beneath a proposed ash disposal area “Sounding” measurements with electrode spacing values extending up
to 100 feet and Lee electrode measurements were used to identify and locate specific anomaly maxima identified anomalies on
the order of 200 chms-feet contrasted with expected values of 300 to 400 ohms-feet and were attributed to lower resistivities
inherent in water-filled solution cavities below a shallow water table Prominent cavity complexes at 5 to 15 feet depth were
predicted in areas of low resistivity anomalies in the otherwise geoelectrically uniform, Eocene Ocala limestone Shallow test
borings confirmed the presence of a significant concentration of shallow cavities in the predicted areas This study demonstrated
the feasibility of electrical resistivity measurements as a reconnaissance tool to economically determine subsurface cavities
and to aid in developmental and environmental planning |
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