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2024 Vol.34, Issue 4 Preview Page

Research Article

Applicability of Long-Range GPR Survey for Seawater Intrusion Assessment

해수 침투 특성 평가를 위한 장심도 GPR 탐사 적용성 연구

Huieun Yu1
,
Seung Gyu Hyun2*
유 희은1
,
현 승규2*
1Ph.D. Candidate, Department of Energy and Mineral Resources Engineering, Sejong University
2Principal Researcher, Division of Safety Inspection, Korea Institute of Nuclear Safety
1세종대학교 에너지자원공학과 박사과정
2한국원자력안전기술원 원자력검사단 책임연구원
*Corresponding Author
31 December 2024. pp. 637-647
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Abstract

To ensure the safety of radioactive waste disposal facilities, continuous monitoring during construction and after closure is essential, particularly for coastal sites where seawater can increase the permeability of crystalline rocks and promote fracture zone formation. While borehole sampling provides high-accuracy data, its limited spatial coverage restricts broader interpretations. In contrast, geophysical surveys enable the acquisition and analysis of 2D and 3D data, offering valuable insights into extensive subsurface structures. Ground penetrating radar (GPR) is particularly advantageous due to its ability to non-destructively acquire deep subsurface data in a short time. This paper evaluate the possibility of seawater intrusion using the results of long-range GPR survey along the coast near a low- and intermediate-level radioactive waste disposal facility is located. The applicability of long-range GPR surveys for monitoring seawater intrusion was evaluated by comparing the previously published groundwater flow modeling scenarios and groundwater electrical conductivity data. A comparative analysis of long-range GPR survey data and the conductivity of groundwater validated the accuracy of long-range GPR in accessing seawater intrusion characteristics. Long-range GPR can be employed to verify groundwater flow model for seawater intrusion evaluations, and can also be applied to structural geological investigations related to hydrogeological characteristics, as well as site characterization monitoring.

Keywords
seawater intrusion
ground penetrating radar
site characterization
hydrogeology

방사성 폐기분 처분시설(이하 ‘방폐장’)은 방사성 핵종의 누출 평가를 위해 건설 중, 운영 중 및 폐쇄 후에도 안전성 확보를 위한 지속적인 부지특성 모니터링이 필요하다. 특히, 해안 부근의 방폐장은 해수의 영향을 받아 결정질암의 투수성이 증가하거나 단열대의 생성 가능성이 높아 지속적인 모니터링이 요구된다. 시추공에서 취득한 시료를 활용한 모니터링은 높은 정확성을 제공하지만, 제한된 지점 정보만 제공하기 때문에 공간적 해석에는 한계가 있다. 반면, 지구물리탐사는 2차원, 3차원의 자료를 확보하여 넓은 영역의 지하구조를 평가할 수 있는 유용한 기법이다. 그 중 지표투과레이더(ground penetrating radar, GPR)는 비파괴적이며, 짧은 시간 안에 깊은 심도의 자료를 취득할 수 있어 활용도가 높다. 이 연구에서는 경주 중 ‧ 저준위 방폐장이 위치한 해안선을 따라 장심도 GPR 탐사를 수행하여 해수 침투 특성을 평가하였다. 더불어, 방폐장 부지에 대한 기존 지하수 유동 모델링 결과와 지하수 전기전도도 모니터링 자료와 비교 ‧ 검토하여 장심도 GPR 탐사가 해수 침투 관련 모니터링에 적용할 수 있는지를 확인하였다. 장심도 GPR 탐사 자료와 지하수 관정 내 전기전도도 자료를 비교 검토하여 해수 침투 특성 평가를 위한 장심도 GPR의 정확도가 확보됨을 확인하였다. 이는 GPR 탐사가 해수 침투 평가를 위한 지하수 유동 모델링의 검증을 위한 방법으로 이용될 수 있으며, 수리지질학적 특성과 연계되는 구조 지질학적 특성 조사 및 부지특성 모니터링과 연계하여 사용될 수 있음을 확인하였다.

키워드
해수 침투
지하투과레이더
부지특성
수리지질
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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 : 34
  • No :4
  • Pages :637-647
  • Received Date : 2024-12-20
  • Revised Date : 2024-12-23
  • Accepted Date : 2024-12-26
  • DOI :https://doi.org/10.9720/kseg.2024.4.637
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