Abstract
Electromagnetic wave CT, containing velocity CT and attenuation CT, is one of the effective geophysical prospecting methods to detect underground caves. The accuracy is low when applying the velocity CT and the attenuation CT separately into investigation in a karst area. This paper briefs the basic theory of electromagnetic wave CT imaging, and then mainly introduces the basic theory and applying methodology of cross-hole radar tomography for exploration in a karst area. Through numerical value simulation and practice verification, the advantage and disadvantage of the velocity CT and the attenuation CT of electromagnetic wave based on very high frequency have been studied, respectively. It has been found that the attenuation CT does better in confirming the location of karst caves, and the velocity CT is better in determining the shape of the karst caves although the whole distribution regular of the velocity CT is almost consistent with the attenuation CT.
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This paper is part of result of the project funded by Science and Technology of Western Traffic Construction Items under the grant of No.200231800018 and NSFC under grant of No. 40772188. The authors also give great thanks to two anonymous reviewers for their kind comments and suggestions, which greatly improve the quality of the manuscript.
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Tan, H., Huang, J. & Qi, S. Application of cross-hole radar tomograph in karst Area. Environ Earth Sci 66, 355–362 (2012). https://doi.org/10.1007/s12665-011-1244-0
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DOI: https://doi.org/10.1007/s12665-011-1244-0