Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Preliminary Study on Alluvial Soil Characteristics for Clogging Possibility in Groundwater Artificial Recharge Area

인공함양 지역 클로깅 가능성 평가를 위한 충적층 토양 특성에 관한 예비 연구

  • Hwang, Jeong (Dept. of Disaster Prevention Engrg., Daejeon Univ.) ;
  • Choi, Myoung-Rak (Dept. of Disaster Prevention Engrg., Daejeon Univ.) ;
  • Kim, Gyoo-Bum (Dept. of Disaster Prevention Engrg., Daejeon Univ.)
  • 황정 (대전대학교 재난안전공학과) ;
  • 최명락 (대전대학교 일반대학원 방재학과) ;
  • 김규범 (대전대학교 재난안전공학과)
  • Received : 2024.01.11
  • Accepted : 2024.02.04
  • Published : 2024.02.29
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Abstract

Artificial recharge systems have been employed to solve drought problems due to global climate change. Despite the increased usage, the applications of artificial recharge systems are limited by clogging problems, which reduce recharge rates. In this study, the soil texture and mineral characteristics of alluvial soil in a planned artificial recharge system area were investigated to evaluate the possibility of chemical clogging during the injection of stream water. The primary minerals contained in the clastic particles are quartz, K-feldspar, plagioclase, and biotite, and the secondary minerals filling the pore space are illite, kaolinite and Fe-oxide. The fact that carbonate and sulfate are observed as secondary minerals in the pore space suggests that chemical clogging has not occurred by the interaction between the groundwater and surface water in the study area. Thus, monitoring soil properties, e.g., the formation and growth of secondary minerals in the pore space, is required to investigate the possibility of chemical clogging in artificial recharge systems.

전 지구적 기후변화에 따른 용수확보 방안으로 인공함양 기법이 활용되고 있다. 함양률을 감소시키는 클로깅 문제는 인공함양 기법의 활용에 큰 장애가 되고 있다. 이 연구는 하천수 주입 과정에서 발생할 가능성이 있는 클로깅 평가를 위한 기초자료를 확보하기 위해 인공함양 예정 지역 충적층의 토양 조직과 광물 특성을 분석하였다. 충적층 쇄설성 입자의 주요 구성 광물은 석영, 정장석, 사장석, 흑운모 등이며, 공극을 충진하는 주요 2차 광물은 일라이트, 카오린나이트, Fe-산화광물이다. 2차 광물로서 탄산염 혹은 황산염 광물의 산출이 없는 것은 인공함양 실험 전인 연구 지역 충적층에서는 지하수와 지표수 간의 반응에 의한 화학적 클로깅은 발생하지 않았음을 시사한다. 인공함양 실험과 관련된 화학적 클로깅에 대한 평가를 위해 대수층 내 공극에서 2차 광물의 생성과 성장과 같은 충적층의 토양특성에 대한 모니터링이 필요하다.

Keywords

Acknowledgement

이 연구는 2023년도 대전대학교 학술연구비의 지원을 받았다.

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