지구물리와물리탐사 (Geophysics and Geophysical Exploration)

  • 제16권3호
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  • Pages.154-162
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  • 2013
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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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지하수 인공함양 지역 충적층 특성 평가를 위한 전기비저항탐사

An Electrical Resistivity Survey for the Characterization of Alluvial Layers at Groundwater Artificial Recharge Sites

  • 원병호 (한국지질자원연구원 지구환경연구본부) ;
  • 신제현 (한국지질자원연구원 지구환경연구본부) ;
  • 황세호 (한국지질자원연구원 지구환경연구본부) ;
  • 함세영 (부산대학교 지질환경과학과)
  • Won, Byeongho (Geologic Environment Division, Korean Institute of Geoscienceand Mineral Resources) ;
  • Shin, Jehyun (Geologic Environment Division, Korean Institute of Geoscienceand Mineral Resources) ;
  • Hwang, Seho (Geologic Environment Division, Korean Institute of Geoscienceand Mineral Resources) ;
  • Hamm, Se-Yeong (Department of Geological Sciences, Pusan National University)
  • 투고 : 2013.05.28
  • 심사 : 2013.08.09
  • 발행 : 2013.08.31
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초록

지하수 인공함양 지역에 충적층 특성 평가를 위한 목적으로 수직탐사와 2차원 전기비저항탐사를 수행하였다. 지하수 인공함양의 주 대상 지층인 충적층 내에 존재하는 세립자들은 지하수와 함께 이동하여 클로깅 현상을 일으킬 수 있으므로 주의를 요하는데, 전기비저항탐사를 통해서 저비저항을 보이는 포화된 실트 또는 점토의 분포를 파악하는 것이 매우 효과적이다. 반면에, 이러한 저비저항대가 두터운 경우는 지층에서 인위적으로 보내진 전기가 저비저항대의 층으로만 통하여 그 이하의 지층 또한 저비저항대로 왜곡되는 단점을 가지므로 해석 시에 주의가 요구된다. 본 연구는 이러한 영향을 고려하여 격자형태의 35개의 수직탐사 측점과 10개의 2차원탐사 측선을 따라서 탐사를 수행하여 각각의 장점인 수직적인 분해능과 수평적인 분해능을 비교 및 보완하였다. 수직탐사를 통해 지하 30 m 이후에 약 15 m 두께로 인공함양의 주대상 지층인 모래자갈층이 퇴적되어 있을 것으로 사료되며 두 탐사의 비교를 통해 연구지 지하 일부 구간에 클로깅 현상을 유발할 수 있는 실트 또는 점토의 분포가 예상되었다. 이러한 결과는 지하수 인공함양을 위한 주입정 및 관측정의 위치와 심도를 설계하는데 있어 충적층의 퇴적양상 파악에 대한 전기비저항탐사의 적용성을 보여준다.

Vertical electrical sounding and 2D electrical resistivity survey were applied for evaluating the characteristics of alluvial layers at a groundwater artificial recharge site. The fine particles in alluvial layer, main target layer of groundwater artificial recharge, may cause clogging phenomena. In this case, electrical resistivity method is an effective technique to verify the spatial distribution of low-resistivity layers, such as saturated silts and clays. On the other hand, much attention should be paid to interpret the resistivity data in unconsolidated layers, because thick clayey overburden sometimes produces a masking effect on underlying interbedded resistive sands and gravels. Considering these points, we designed 35 points arranged in a grid form for vertical electrical sounding and 10 lines for 2D electrical resistivity survey, and concentrated our effort on enhancing the vertical and horizontal resolution of resistivity images. According to the results, 15 meters thick layers consisting of sands and gravels are located in 30 meters below ground. And the spatial distribution of silts and clays are mapped, which may cause clogging. Consequently, this approach can contribute to design and determine the location and depth of injection and observation wells for groundwater artificial recharge.

키워드

참고문헌

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피인용 문헌

  1. Porosity Profiles in Alluvium Soil by Using Electrical Resistivity and Geostatistic Method vol.15, pp.5, 2015, https://doi.org/10.9798/KOSHAM.2015.15.5.147
  2. Mapping lithological variations in a river basin of West Bengal, India using electrical resistivity survey: implications for artificial recharge vol.77, pp.17, 2018, https://doi.org/10.1007/s12665-018-7813-8