Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Effectiveness of Double Negative Barriers for Mitigation of Sewater Intrusion in Coastal Aquifer: Sharp-Interface Modeling Investigation

경계면 수치 모델을 이용한 해안 지역 이중 양수정의 해수침투 저감 효과

  • Jung, Eun Tae (Dept. of Civil Eng., Dong-A University) ;
  • Lee, Sung Jun (Research Institute of Construction Technology and Planning., Dong-A University) ;
  • Lee, Mi Ji (Dept. of Civil Eng., Dong-A University) ;
  • Park, Namsik (Dept. of Civil Eng., Dong-A University)
  • 정은태 (동아대학교 대학원 토목공학과) ;
  • 이성준 (동아대학교 건설기술연구소) ;
  • 이미지 (동아대학교 토목공학과) ;
  • 박남식 (동아대학교 공과대학 토목공학과)
  • Received : 2014.10.06
  • Accepted : 2014.10.20
  • Published : 2014.11.30
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Abstract

Saltwater pumping method can be used to mitigate saltwater intrusion in coastal aquifers. However, the saltwater pumping well may discharge large freshwater along with saltwater, thereby wasting precious resources. A double negative barrier was proposed: an inland well to capture freshwater and a saltwater well near the coastline to pump saltwater. A previous study anaylzed effects of double negative barriers in dispersion-dominated coastal aquifers and determined the critical pumping rate at the saltwater well which minimized the saltwater ratio at the freshwater well. However, the study resulted in 1~15% of saltwater ratios, which were too high, for example, for drinking water standards. This study analyzed cases that were considered in the previous study, but for advection-dominated cases, and found that freshwater with sufficiently low saltwater ratios could be developed at the freshwater well. In addition, for optimal groundwater management of a watershed not only the minimum saltwater ratio at the freshwater well but also the least freshwater wasted at the saltwater well must be pursued.

해안지역에서 지하수 해수침투 저감을 위하여 해수 양수 관정을 가동할 때 해수정으로 많은 양의 담수가 낭비되는 사례가 있다. 해수 침투를 저감시키고 낭비되는 담수를 유용하게 활용하기 위하여 이중 양수정이 제안된 바 있다. 이중 양수정은 해수 양수를 위한 해안 쪽의 해수정과 담수 양수를 위한 내륙 쪽의 담수정으로 구성된다. 선행 연구에서는 담수정의 해수 비율을 최소화시키기 위한 해수정의 양수량을 산정하였으나 담수정의 해수비율이 1~15% 범위로 나타나 담수정에서 담수를 확보하기 어렵다고 판단하였다. 본 연구에서는 이송이 지배적인 상황에서 이중 양수정의 효과를 분석하였다. 연구 결과 담수정에서 저염도 지하수를 확보할 수 있음을 밝혔다. 또한 해안 유역 차원의 적정 지하수관리를 위해서는 담수정의 해수비율을 최소화하는 것 외에도 해수정으로 낭비되는 담수량을 최소화하는 것도 함께 고려해야한다.

Keywords

References

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