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Safety Analysis of Reservoir Dikes in South Korea through the Interpretation of the Electrical Resistivity Data Considering Three-dimensional Structure

3차원 구조를 고려한 전기비저항 탐사자료 해석을 통한 국내 저수지 제체 안전성 분석

  • Song, Sung-Ho (Rural Research Institute, Korea Rural Community Corporation) ;
  • Yong, Hwan-Ho (Rural Research Institute, Korea Rural Community Corporation) ;
  • Lee, Gyu-Sang (Rural Research Institute, Korea Rural Community Corporation) ;
  • Cho, In-Ky (Division of Geology and Geophysics, Kangwon National University)
  • 송성호 (한국농어촌공사 농어촌연구원) ;
  • 용환호 (한국농어촌공사 농어촌연구원) ;
  • 이규상 (한국농어촌공사 농어촌연구원) ;
  • 조인기 (강원대학교 지질.지구물리학부)
  • Received : 2019.05.15
  • Accepted : 2019.06.17
  • Published : 2019.08.31

Abstract

Resistivity inversion result may be distorted if the seepage line fluctuation within central core with the change of reservoir water level as well as the conductivity of the reservoir water is not taken into consideration because the reservoir dike is composed of three-dimensional (3D) resistivity structure. Consequently, to accurately analyze the resistivity changes inside the reservoir dike according to the change of reservoir water level, 3D electrical resistivity modeling for the 2D survey line considering topography and physical properties of dam components was carried out. In addition, 2D inversion was performed with the simulated 2D resistivity data for a given 3D model in order to compare it with the inversion result of real field data. For 283 reservoirs in Korea, 2D inversion results for the simulated 2D data and field 2D resistivity data were compared. Finally, the reservoirs with an inversion ratio of 50% or less were selected as reservoirs that require further precise investigation.

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