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3D Resistivity Survey for Dam Safety Inspection

저수지 안전진단을 위한 3차원 전기비저항 탐사

  • Cho, In-Ky (Division of Geology and Geophysics, Kangwon National University) ;
  • Yong, Hwan-Ho (Rural Research Institute, Korea Rural Community Corporation)
  • 조인기 (강원대학교 지질.지구물리학부) ;
  • 용환호 (한국농어촌공사 농어촌연구원)
  • Received : 2019.04.28
  • Accepted : 2019.06.25
  • Published : 2019.08.31

Abstract

Resistivity method has been used for the dam safety inspection and, for the convenience of fieldwork, two-dimensional (2D) resistivity data has been usually measured along the dam crest. However, since the dam has three-dimensional (3D) structure, 2D resistivity survey along the dam crest violates 2D assumption and 3D effects caused by 3D topography and material properties in the dam distort the inversion result of 2D resistivity data acquired along the dam crest. Furthermore, it is really hard to evaluate the 3D structure of the dam and 3D leakage pathway using 2D resistivity survey because 2D resistivity survey can provide only 2D resistivity section beneath the survey line. In this study, 3D resistivity survey was conducted at a dam in Korea. By comparing the results from 3D and 2D resistivity surveys, merit and demerits of 3D survey were investigated. Finally, it was confirmed that 3D survey can provide more accurate information about the dam status and 3D leakage pathway compared to the 2D survey. Therefore the 3D resistivity survey should be actively expanded for more accurate dam safety inspection even though more time and expense are required.

Acknowledgement

Supported by : 한국연구재단

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