Effective electrode array in mapping karst hazards in electrical resistivity tomography

Citation

Material Information

Title:
Effective electrode array in mapping karst hazards in electrical resistivity tomography
Series Title:
Environmental Geology
Creator:
Zhou, Wanfang
Beck, Barry F.
Adams, Angela L.
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Electrical Resistivity Tomography ( local )
Electrode Array ( local )
Karst ( local )
Sinkholes ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
When conducting environmental and engineering investigations in karst terranes, engineers and geologists often supplement exploratory borehole results with data gathered from surface geophysics to reduce the site-characterization cost and establish the most useful locations for borings or samples. When conducting resistivity investigations, a frequently occurring problem is the need to determine which of the many existing electrode configurations will respond best to the material changes in karst features. Each array has its advantages and disadvantages in terms of depth of investigation, sensitivity to horizontal or vertical variations, and signal strength. In the application presented in this paper, numerical forward modeling was conducted of dipole–dipole, Schlumberger, and Wenner arrays, and they produced markedly different anomaly shapes for a conceptual model of the development of a cover-collapse sinkhole. The resolution of the three above-mentioned arrays was further evaluated along a section of I-70 near Frederick, Maryland, where a sinkhole had occurred in the median of the highway. The image from the dipole–dipole array appeared to be better than those from the Wenner and Schlumerger arrays in displaying the sinkhole collapse area. However, they are all less effective than a mixed array, in which apparent resistivities from all the three arrays are combined and processed together in the model. Because the mixed array requires a significant increase in data collection, the dipole–dipole array appears to be the most effective and less costly configuration in mapping karst hazards areas. This conclusion was then confirmed by two case studies.
Original Version:
Environmental Geology, Vol. 42, no. 8 (2002-11).

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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University of South Florida
Karst Information Portal

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