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Evaluation of Capacitively-Coupled Electrical Resistivity for Locating Solution Cavities Overlain by Clay-rich Soils

Sabo, Stephen Henry
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1219092853

Abstract Details

2008, Master of Science (MS), Bowling Green State University, Geology.
The introduction of capacitively-coupled resistivity instruments has greatly decreased the amount of time required for the collection of high quality resistivity data. To date, most studies using this equipment have been done in areas with resistive overburden, which enhances the depth of penetration. Much less is known about the performance of this equipment in areas with conductive overburden. The purpose of this study is to test the capacitively-coupled resistivity method for the detection of cavities in areas overlain by clay-rich soils.Two sites were investigated: Crystal Rock Cave in Erie County, Ohio consists of a sandy clay soil overlying a known cave system; and Dunbridge in Wood County, Ohio, which has a dense clay till overlying a single solution cavity that most likely is a product of oilfield activity. Data were collected with a Geometrics OhmMapper capacitively-coupled resistivity system along traverses at each site and processed using the Geometrics MagMapTM2000 software. Res2Dinv software was then used to invert the field data and produce resistivity cross sections along the traverses. Resistivity traverses at the Crystal Rock Cave site were completed with transmitter-receiver separation distances of up to 40 m, which correspond to depths of approximately 12 m. When inverted, the data showed a number of suspected sinkholes and cavities, some of which correspond to known cave locations. Traverses at the Dunbridge site were completed with transmitter-receiver separation distances of only 15 m, which limited the depth of penetration to approximately 4 m. Although the survey yielded apparent resistivity values consistent with clay-rich soils, it failed to unequivocally locate the solution cavity. This study has shown that while capacitively-coupled resistivity systems have the potential to perform well in light clay soils or resistive overburden, this method would not be the preferred method of data collection in areas with thick, clay-rich overburden. Although this method was effective in finding buried cavities at the Crystal Rock Cave Site, it failed to provide an unambiguous interpretation of the subsurface at the Dunbridge location.
Charles Onasch, PhD (Advisor)
Jeffrey Snyder, PhD (Committee Member)
50 p.
Geology; Geophysics
Electrical Resistivity; Capacitively-Coupled Resistivity; Ohmmapper

Recommended Citations

Citations

  • Sabo, S. H. (2008). Evaluation of Capacitively-Coupled Electrical Resistivity for Locating Solution Cavities Overlain by Clay-rich Soils [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1219092853

    APA Style (7th edition)

  • Sabo, Stephen. Evaluation of Capacitively-Coupled Electrical Resistivity for Locating Solution Cavities Overlain by Clay-rich Soils. 2008. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1219092853.

    MLA Style (8th edition)

  • Sabo, Stephen. "Evaluation of Capacitively-Coupled Electrical Resistivity for Locating Solution Cavities Overlain by Clay-rich Soils." Master's thesis, Bowling Green State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1219092853

    Chicago Manual of Style (17th edition)

bgsu1219092853
2,067
© 2008, some rights reserved.Creative Commons License Evaluation of Capacitively-Coupled Electrical Resistivity for Locating Solution Cavities Overlain by Clay-rich Soils by Stephen Henry Sabo is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Bowling Green State University and OhioLINK.
Release 3.2.12