지구물리와물리탐사 (Geophysics and Geophysical Exploration)

  • 제22권3호
  • /
  • Pages.160-167
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  • 2019
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  • 1229-1064(pISSN)
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  • 2384-051X(eISSN)
한국지구물리·물리탐사학회 (Korean Society of Earth and Exploration Geophysicists)
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3차원 구조를 고려한 전기비저항 탐사자료 해석을 통한 국내 저수지 제체 안전성 분석

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

  • 송성호 (한국농어촌공사 농어촌연구원) ;
  • 용환호 (한국농어촌공사 농어촌연구원) ;
  • 이규상 (한국농어촌공사 농어촌연구원) ;
  • 조인기 (강원대학교 지질.지구물리학부)
  • 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)
  • 투고 : 2019.05.15
  • 심사 : 2019.06.17
  • 발행 : 2019.08.31
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초록

저수지 제체는 3차원 전기비저항 구조로 구성되어 있기 때문에, 전기비저항 격자구조에 담수호의 수위변화에 따른 제체 내부의 침윤선 변동과 함께 담수호의 전기전도도가 고려되지 않는 경우 전기비저항 역산 결과가 왜곡될 수 있다. 이 연구에서는 3차원 전기비저항 탐사 모델링을 통하여, 저수지의 3차원 비저항 구조와 저수지 수위의 변화에 따른 제체 내부의 비저항 변화를 해석하였다. 이 분석 결과에 근거하여 국내 283개소 저수지를 대상으로 3차원 모델링에 의한 2차원 이론자료와 현장 2차원 탐사자료에 대한 역산 결과를 비교하였다. 마지막으로 두 역산의 비가 50% 이상이 되는 저수지를 추가 정밀조사 대상 저수지로 선정하였다.

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.

키워드

참고문헌

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