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2026 Vol.59, Issue 5 Preview Page
Experimental study on mitigation effect of saltwater intrusion by semi-permeable barrier during freshwater pumping in a coastal aquifer

해안 대수층 내 담수 양수 시 반 투수성 차단벽에 의한 염수 침투 저감효과에 대한 실험적 연구

Mincheol Kima
,
Woochang Jeongb*
김 민철a
,
정 우창b*
aMaster Course Student, Department of Infrastructure System Civil Engineering, Kyungnam University, Changwon, Korea
bProfessor, Department of Civil Engineering, Kyungnam University, Changwon,, Korea
a경남대학교 사회기반시스템공학과 토목공학 석사과정
b경남대학교 재난안전건설학과 교수
*Corresponding Author
31 May 2026. pp. 489-502
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Abstract

In this study, hydraulic model test was conducted to investigate the reduction effect of saltwater intrusion according to changes in the width of a semi-permeable barrier and the pumping rate. A porous medium was represented by filling an acrylic tank (40.0 cm long, 25.0 cm high, and 1.0 cm wide) with glass beads, and freshwater and saltwater supply tanks were installed on both sides of the tank. A glass pumping pipe connected to a pump was positioned 15.0 cm from the saltwater supply tank and 17.0 cm below the top of the porous medium. The head difference (Δh) between freshwater and saltwater was maintained at 1.0 cm. Before pumping, experiments were performed by increasing the width of the semi-permeable barrier from 1.0 to 3.0 cm in 1.0 cm increments. In the absence of pumping, the advancement distance of saltwater wedge before installing the barrier was 14.6 cm; however, after installing the semi-permeable barrier, the distance decreased to 13.3, 12.0, and 10.5 cm as the width increased to 1.0, 2.0, and 3.0 cm, respectively. At a pumping rate of 25.0 ml/min, the saltwater wedge migration distance decreased by 8.72%, 13.85%, and 33.33%, respectively, compared to before pumping. For a pumping rate of 30.0 ml/min, the distances decreased by 7.32%, 12.20%, and 25.83%; at 35.0 ml/min, they decreased by 6.98%, 11.63%, and 21.86%; and at 40.0 ml/min, the reduction rates were 4.35%, 7.39%, and 15.22%, respectively.

Keywords
Saltwater intrusion
Saltwater wedge
Reduction effect
Semi-permeable porous barrier
Pumping rate
hydraulic model experiment

본 연구에서는 반 투수성 차단벽의 두께와 양수량의 변화에 따른 염수 침투 저감효과룰 조사하기 위해 수리모형 실험을 수행하였다. 길이 40.0 cm와 높이 25.0 cm 그리고 폭 1.0 cm의 아크릴로 제작된 수조 내 글래스 비드(glass bead)를 채워 다공성 매질로 고려하였으며, 수조의 양 측에 각각 담수 공급 수조와 염수 공급 수조를 설치하였다. 양수펌프와 연결된 유리로 된 양수관은 염수 공급 수조로부터 15.0 cm 그리고 다공성 매질 상부로부터 17.0 cm 아래에 설치하였다. 담수와 염수의 수두 차(Δh)는 1.0 cm로 유지하게 했으며, 양수 전 반 투수성 차단벽의 폭을 1.0부터 3.0 cm까지 1.0 cm씩 증가시켜 실험을 수행하였다. 양수하지 않았을 경우 반 투수성 차단벽 설치 전 염수쐐기 진출 거리는 14.6 cm이며, 반 투수성 차단벽 설치 후 폭을 1.0, 2.0 그리고 3.0 cm까지 증가할 때 염수쐐기의 진출 거리는 각각 13.3, 12.0 그리고 10.5cm로 감소했다. 양수량이 25.0 ml/min일 때 양수 전에 비해 염수쐐기 진출 거리는 각각 8.72%, 13.85% 그리고 33.33%로 감소하였으며, 양수량 30.0 ml/min의 경우 7.32%, 12.20% 그리고 25.83%, 35.0 ml/min의 경우 6.98%, 11.63% 그리고 21.86% 그리고 40.0 ml/min의 경우 4.35%, 7.39% 그리고 15.22% 감소하였다.

키워드
염수 침투
염수쐐기
저감효과
반 투수성 차단벽
양수량
수리모형 실험
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 59
  • No :5
  • Pages :489-502
  • Received Date : 2026-01-09
  • Revised Date : 2026-03-24
  • Accepted Date : 2026-03-25
  • DOI :https://doi.org/10.3741/JKWRA.2026.59.5.489
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