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Research Article

Application of Depth Resolution and Sensitivity Distribution of Electrical Resistivity Tomography to Modeling Weathered Zones and Land Creeping

전기비저항 깊이분해능 및 감도분포: 풍화층 및 땅밀림 모델에 대한 적용

Jeong-In Kim1
,
Ji-Soo Kim2
,
Young-Don Ahn3
,
Won-Ki Kim4*
김 정인1
,
김 지수2
,
안 영돈3
,
김 원기4*
1Master, Department of Earth & Environmental Science, Chungbuk National University
2Professor, Department of Earth & Environmental Science, Chungbuk National University
3CEO, BOMIN Global Co., Ltd.
4Senior Researcher, Maritime Technology Research Institute, Agency for Defense Development
1충북대학교 지구환경과학과 석사
2충북대학교 지구환경과학과 교수
3보민글로벌(주) 대표이사
4국방과학연구소 해양기술연구원 선임연구원
*Corresponding Author
31 March 2022. pp. 157-171
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Abstract

Electrical resistivity tomography (ERT) is a traditional and representative geophysical method for determining the resistivity distributions of surrounding soil and rock volumes. Depth resolution profiles and sensitivity distribution sections of the resistivities with respect to various electrode configurations are calculated and investigated using numerical model data. Shallow vertical resolution decreases in the order of Wenner, Schlumberger, and dipole-dipole arrays. A high investigable depth in homogeneous medium is calculated to be 0.11-0.19 times the active electrode spacing, but is counterbalanced by a low vertical resolution. For the application of ERT depth resolution profiles and sensitivity distributions, we provide subsurface structure models for two types of land-creping failure (planar and curved), subvertical fracture, and weathered layer over felsic and mafic igneous rocks. The dipole-dipole configuration appears to be most effective for mapping land-creeping failure planes (especially for curved planes), whereas the Wenner array gives the best resolution of soil horizons and shallow structures in the weathered zone.

Keywords
electrical resistivity array
depth resolution
sensitivity distribution
land creeping
weathered layer

전기비저항 토모그래피는 지하의 토양이나 암석 매질의 전기비저항 분포를 결정하는 대표적인 지구물리탐사법이다. 전극 배열에 따른 비저항의 깊이 분해능과 감도분포를 수치모델 자료를 대상으로 계산하고 해석한 결과 균질 매질에서의 천부 분해능은 웨너, 슐럼버저, 쌍극자 배열순으로 감소하며 깊이에 따른 최대 탐지능은 그 역순으로서 0.11-0.19 L (L: 전극사이의 간격) 깊이범위에서 계산되어 쌍극자 배열이 가장 좋았다. 전극 배열에 따른 비저항의 깊이 분해능과 감도분포의 효과를 살펴보기 위해 땅밀림 파괴면의 두 가지 형태(평면, 곡선), 수직 파쇄대, 규장질 및 고철질 화성암의 풍화층에 대한 수치 모델링 자료를 사용하였다. 표토층 하부의 수직 파쇄대와 땅밀림 특히 원호 파괴면의 영상화 결과에서는 쌍극자 배열법이 효과적이었으며 천부의 불연속면과 풍화층의 분해능은 웨너법에서 상대적으로 좋게 나타났다.

키워드
전기비저항 배열
깊이 분해능
감도분포
땅밀림
풍화층
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 32
  • No :1
  • Pages :157-171
  • Received Date : 2022-01-28
  • Revised Date : 2022-03-04
  • Accepted Date : 2022-03-11
  • DOI :https://doi.org/10.9720/kseg.2022.1.157
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