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2026 Vol.59, Issue 9 Preview Page
Experimental analysis of vertical seawater intrusion and freshwater recovery in a coastal aquifer behind a seawall under seawater flooding

해수범람에 따른 호안 배후 해안대수층의 수직 해수침투 및 담수 회복에 관한 실험적 분석

Sung Choa
,
Taegeon Hwangbc
,
Seungjun Shind
,
Yeonjoong Kime
,
Woo-Dong Leef*
조 성a
,
황 태건bc
,
신 승준d
,
김 연중e
,
이 우동f*
aSenior Manager, Geum River Project Management Department, Korea Water Resources Corporation, Jeonju, Korea
bResearcher, Institute of Marine Industry, Gyeongsang National University, Tongyeong, Korea
cGraduate Student, Department of Ocean Civil Engineering, Gyeongsang National University, Tongyeong, Korea
dGraduate Student, Department of Ocean Civil Engineering, Gyeongsang National University, Tongyeong, Korea
eResearch Fellow, Land and Environment Research Group, Water Management Division, Korea Environment Institute, Sejong, Korea
fProfessor, Department of Ocean Civil Engineering, Gyeongsang National University, Tongyeong, Korea
a한국수자원공사 금강사업처 차장
b경상국립대학교 해양산업연구소 연구원
c경상국립대학교 해양토목공학과 대학원생
d경상국립대학교 해양토목공학과 대학원생
e한국환경연구원 국토환경연구본부 물관리연구실 부연구위원
f경상국립대학교 해양토목공학과 교수
*Corresponding Author
30 September 2026. pp. 1003-1016
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Abstract

Rising sea levels and extreme coastal hazards increase the likelihood of seawater flooding, thereby exacerbating the risk of seawater intrusion into coastal aquifers. This study experimentally investigated the vertical seawater intrusion and freshwater recovery processes occurring in a coastal aquifer behind an impermeable seawall under seawater flooding conditions. To this end, sand tank experiments were conducted under varying inundation heights and inundation distances. In addition, a computer vision-based image analysis method was applied to track the spatiotemporal evolution of the seawater region and to quantify its expansion and recovery characteristics. The results showed that seawater introduced from the land surface propagated downward and interacted with the pre-existing seawater region. As inundation height increased, the spatial extent of the seawater region changed, whereas the maximum seawater-region area exhibited a nonlinear response. In contrast, as the inundation distance increased, both the amount of seawater entering the aquifer and the spatial extent of the seawater region increased markedly, resulting in a substantial increase in the time required to reach the recovery criterion. Furthermore, the time required to reach the recovery criterion was more sensitive to inundation distance than to inundation height, indicating that inundation distance is a key factor governing the persistence and recovery of the seawater region in coastal aquifers.

Keywords
Seawater flooding
Vertical seawater intrusion
Computer vision
Recovery criterion
Sand tank experiment

해수면 상승과 극한 연안재해는 해수범람의 발생 가능성을 증가시키며 이에 따라 해안대수층의 해수 침투 위험을 가중시킨다. 본 연구는 해수범람 조건에서 불투과성 호안 배후 해안대수층에서 발생하는 수직적 해수침투 및 담수 회복 과정을 실험적으로 분석하였다. 이를 위해 침수높이와 침수거리를 달리한 모래수조 실험을 수행하였다. 또한 컴퓨터 비전 기반 영상분석 기법을 적용하여 해수영역의 시공간적 변화를 추적하고, 그 확장 및 회복 특성을 정량화하였다. 실험 결과, 지표면으로부터 유입된 해수는 하향 전파되며 기존 해수영역과 상호작용하는 것으로 나타났다. 침수높이가 증가함에 따라 해수영역의 공간적 범위는 변화하였으나, 최대 해수영역 면적은 비선형적 응답을 보였다. 반면 침수거리가 증가할수록 대수층으로 유입되는 해수량과 해수영역의 공간적 확장 범위가 현저히 증가하였으며, 이에 따라 회복 판정 기준에 도달하는 데 소요되는 시간도 크게 증가하였다. 또한 회복 판정 기준 도달 시간은 침수높이보다 침수거리에 더 민감하게 반응하는 것으로 나타났으며, 이는 침수거리가 해안대수층 내 해수영역의 지속성과 회복을 지배하는 핵심 인자임을 시사한다.

키워드
해수범람
수직적 해수침투
컴퓨터 비전
회복 판정 기준
모래수조 실험
References
1

Abarca, E., and Clement, T.P. (2009). “A novel approach for characterizing the mixing zone of a saltwater wedge.” Geophysical Research Letters, Vol. 36, No. 6, L06402.

10.1029/2008GL036995
2

Anderson, W.P. (2002). “Aquifer salinization from storm overwash.” Journal of Coastal Research, Vol. 18, No. 3, pp. 413-420.

3

Ataie-Ashtiani, B., Volker, R.E., and Lockington, D.A. (1999). “Tidal effects on sea water intrusion in unconfined aquifers.” Journal of Hydrology, Vol. 216, No. 1-2, pp. 17-31.

10.1016/S0022-1694(98)00275-3
4

Bradski, G. (2000). “The OpenCV library.” Dr. Dobb’s Journal, Vol. 25, No. 11, pp. 120-123.

5

Butterworth, S. (1930). “On the theory of filter amplifiers.” Experimental Wireless and the Wireless Engineer, Vol. 7, No. 6, pp. 536-541.

6

Cantelon, J.A., Guimond, J.A., Robinson, C.E., Michael, H.A., and Kurylyk, B.L. (2022). “Vertical saltwater intrusion in coastal aquifers driven by episodic flooding: A review.” Water Resources Research, Vol. 58, No. 11, e2022WR032614.

10.1029/2022WR032614
7

Chang, S.W., and Clement, T.P. (2012). “Experimental and numerical investigation of saltwater intrusion dynamics in flux-controlled groundwater systems.” Water Resources Research, Vol. 48, W09527.

10.1029/2012WR012134
8

Cho, S., Hwang, T., Shin, S., Kang, G., and Lee, W.D. (2025). “Analysis of coastal groundwater salinization induced by coastal inundation using numerical wave tank based on porous body model.” Journal of Coastal Disaster Prevention, Vol. 12, No. 1, pp. 49-59.

10.20481/kscdp.2025.12.1.49
9

Etsias, G., Hamill, G.A., Benner, E.M., Águila, J.F., McDonnell, M.C., Flynn, R., and Ahmed, A.A. (2020). “Optimizing laboratory investigations of saline intrusion by incorporating machine learning techniques.” Water, Vol. 12, No. 11, 2996.

10.3390/w12112996
10

Ferguson, G., and Gleeson, T. (2012). “Vulnerability of coastal aquifers to groundwater use and climate change.” Nature Climate Change, Vol. 2, No. 5, pp. 342-345.

10.1038/nclimate1413
11

Frederiks, R.S., Paldor, A., Carleton, G., and Michael, H.A. (2024). “A comparison of sea-level rise and storm-surge overwash effects on groundwater salinity of a barrier island.” Journal of Hydrology, Vol. 644, 132050.

10.1016/j.jhydrol.2024.132050
12

Glover, R.E. (1959). “The pattern of fresh-water flow in a coastal aquifer.” Journal of Geophysical Research, Vol. 64, No. 4, pp. 457-459.

10.1029/JZ064i004p00457
13

Goswami, R.R., and Clement, T.P. (2007). “Laboratory-scale investigation of saltwater intrusion dynamics.” Water Resources Research, Vol. 43, No. 4, W04418.

10.1029/2006WR005151
14

Hamlington, B.D., Bellas-Manley, A., Willis, J.K., Fournier, S., Vinogradova, N., Nerem, R.S., Piecuch, C.G., Thompson, P.R., and Kopp, R.E. (2024). “The rate of global sea level rise doubled during the past three decades.” Communications Earth & Environment, Vol. 5, 601.

10.1038/s43247-024-01761-5
15

Henry, H.R. (1959). “Salt water intrusion into fresh water aquifers.” Journal of Geophysical Research, Vol. 64, No. 11, pp. 1911-1919.

10.1029/JZ064i011p01911
16

Hwang, T., Kim, H.J., Min, B.I., Seo, M., and Lee, W.D. (2025). “Assessment of potential storm surge hazards at nuclear power plant sites on Korea’s eastern coast.” Journal of Ocean Engineering and Technology, Vol. 39, No. 6, pp. 611-620.

10.26748/KSOE.2025.039
17

Intergovernmental Panel on Climate Change (IPCC) (2021). Climate change 2021: The physical science basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, United Kingdom and New York, NY, U.S., p. 1092.

18

Jeong, Y.H., Lee, S.Y., Lee, J., Lee, T.K., and Lee, W.D. (2021). “Characteristics of seawater intrusion in coastal aquifers due to seawater flooding: A numerical study.” Journal of Coastal Research, Vol. 114, No. SI, pp. 96-100.

10.2112/JCR-SI114-020.1
19

Jin, H., Hwang, T., Kim, H.J., Min, B.I., and Lee, W.D. (2024). “Storm surge simulations using hypothetical scenarios based on historical typhoons impacting the Korean Peninsula: Analysis of storm surge and overtopping volumes.” Journal of Korea Water Resources Association, Vol. 57, No. 12, pp. 1037-1051.

10.3741/JKWRA.2024.57.12.1037
20

Joo, H.J., and Kim, I.C. (2025). “Effect of sea level rise on nearshore waves and wave energy.” Journal of Ocean Engineering and Technology, Vol. 39, No. 6, pp. 621-635.

10.26748/KSOE.2025.058
21

Kim, C.K., and Kim, Y. (2025). “Development of an integrated environmental information management system for estuary-coastal areas: Focusing on risk assessment.” Journal of Ocean Engineering and Technology, Vol. 39, No. 6, pp. 658-670.

10.26748/KSOE.2025.064
22

Kim, H.J., Hwang, T., Min, B.I., Seo, M., and Lee, W.D. (2025a). “Assessment of potential storm surge hazards using the probabilistic synthetic typhoon ensemble: The western coast nuclear power plant site in Korea.” Journal of Ocean Engineering and Technology, Vol. 39, No. 5, pp. 512-521.

10.26748/KSOE.2025.035
23

Kim, H.J., Jin, H., Min, B.I., and Lee, W.D. (2025b). “Storm surge response to typhoon tracks along the Korean Peninsula: Numerical modeling derived from historical typhoons.” Journal of Ocean Engineering and Technology, Vol. 39, No. 2, pp. 152-162.

10.26748/KSOE.2025.011
24

Kim, Y. (2025). “Damage mitigation strategies for flood-prone coastal areas under climate change and sea level rise.” Journal of Ocean Engineering and Technology, Vol. 39, No. 6, pp. 646-657.

10.26748/KSOE.2025.060
25

Klassen, J., and Allen, D.M. (2017). “Assessing the vulnerability of coastal aquifers to sea-level rise using a coupled flow and transport model.” Hydrology and Earth System Sciences, Vol. 21, No. 4, pp. 2035-2049.

26

Lee, W.D., Cho, S., Hwang, T., Shin, S., and Kang, G. (2026). “Proposal and applicability assessment of a computer vision-based quantification method for seawater behavior in coastal aquifers.” Journal of Ocean Engineering and Technology, Vol. 40, No. 2, pp. 197-210.

10.26748/KSOE.2026.011
27

Lee, W.D., Jeong, Y.H., and Hur, D.S. (2015). “Numerical simulation on seawater intrusion in coastal aquifer using N-S solver based on porous body model.” Journal of Korea Water Resources Association, Vol. 48, No. 12, pp. 1023-1035.

10.3741/JKWRA.2015.48.12.1023
28

Lee, W.D., Jeong, Y.H., and Hur, D.S. (2017). “Effects of wave action on seawater intrusion in coastal aquifer and mitigation strategies.” Journal of Ocean Engineering and Technology, Vol. 31, No. 1, pp. 47-59.

10.5574/KSOE.2017.31.1.047
29

Lee, W.D., Jeong, Y.H., and Jeon, H.S. (2019a). “Groundwater flow analysis in a coastal aquifer with the coexistence of seawater and freshwater by using a non-hydrostatic pressure model.” Journal of Coastal Research, Vol. 91, No. SI, pp. 121-125.

10.2112/SI91-025.1
30

Lee, W.D., Yoo, Y.J., Jeong, Y.M., and Hur, D.S. (2019b). “Experimental and numerical analysis on hydraulic characteristics of coastal aquifers with seawall.” Water, Vol. 11, No. 11, 2343.

10.3390/w11112343
31

Lee, W.D., Yoo, Y.J., Jeong, Y.M., Jeong, Y.H., and Hur, D.S. (2018). “Experimental investigation of the effects of revetments on seawater intrusion in coastal aquifers.” Journal of Coastal Research, Vol. 85, No. SI, pp. 441-445.

10.2112/SI85-089.1
32

Lu, C., Chen, Y., Zhang, C., and Luo, Z. (2013). “Steady-state freshwater-seawater mixing zone in stratified coastal aquifers.” Journal of Hydrology, Vol. 505, pp. 24-34.

10.1016/j.jhydrol.2013.09.017
33

Neumann, B., Vafeidis, A.T., Zimmermann, J., and Nicholls, R.J. (2015). “Future coastal population growth and exposure to sea-level rise and coastal flooding: A global assessment.” Plos One, Vol. 10, No. 3, e0118571.

10.1371/journal.pone.011857125760037PMC4367969
34

Park, H.J., Kim, W.I., Ho, J.S., and Ahn, W.S. (2009). “Experimental study to parameterize salt-wedge formations in coastal aquifers.” Journal of Korea Water Resources Association, Vol. 42, No. 11, pp. 1005-1015.

10.3741/JKWRA.2009.42.11.1005
35

Robinson, G., Ahmed, A.A., and Hamill, G.A. (2016). “Experimental saltwater intrusion in coastal aquifers using automated image analysis: Applications to homogeneous aquifers.” Journal of Hydrology, Vol. 538, pp. 304-313.

10.1016/j.jhydrol.2016.04.017
36

Robinson, G., Hamill, G.A., and Ahmed, A.A. (2015). “Automated image analysis for experimental investigations of salt water intrusion in coastal aquifers.” Journal of Hydrology, Vol. 530, pp. 350-360.

10.1016/j.jhydrol.2015.09.046
37

Robinson, G., Moutari, S., Ahmed, A.A., and Hamill, G.A. (2018). “An advanced calibration method for image analysis in laboratory-scale seawater intrusion problems.” Water Resources Management, Vol. 32, pp. 3087-3102.

10.1007/s11269-018-1977-6
38

Strack, O.D.L. (1976). “A single-potential solution for regional interface problems in coastal aquifers.” Water Resources Research, Vol. 12, No. 6, pp. 1165-1174.

10.1029/WR012i006p01165
39

Suh, S.K., Oh, C.M., Kim, W.I., and Ho, J.S. (2010). “Experimental study of freshwater discharge and saltwater intrusion control in coastal aquifers.” Journal of the Korean Society of Hazard Mitigation, Vol. 10, No. 5, pp. 159-168.

40

Violette, S., Boulicot, G., and Gorelick, S.M. (2009). “Tsunami-induced groundwater salinization in southeastern India.” Comptes Rendus Geoscience, Vol. 341, No. 4, pp. 339-346.

10.1016/j.crte.2008.11.013
41

Virtanen, P., Gommers, R., Oliphant, T.E., Haberland, M., Reddy, T., Cournapeau, D., Burovski, E., Peterson, P., Weckesser, W., and Bright, J. et al. (2020). “SciPy 1.0: Fundamental algorithms for scientific computing in Python.” Nature Methods, Vol. 17, No. 3, pp. 261-272.

10.1038/s41592-020-0772-532094914PMC7056641
42

Vithanage, M., Engesgaard, P., Villholth, K.G., and Jensen, K.H. (2012). “The effects of the 2004 tsunami on a coastal aquifer in Sri Lanka.” Ground Water, Vol. 50, No. 5, pp. 704-714.

10.1111/j.1745-6584.2011.00893.x
43

Werner, A.D., Bakker, M., Post, V.E.A., Vandenbohede, A., Lu, C., Ataie-Ashtiani, B., Simmons, C.T., and Barry, D.A. (2013). “Seawater intrusion processes, investigation and management: Recent advances and future challenges.” Advances in Water Resources, Vol. 51, pp. 3-26.

10.1016/j.advwatres.2012.03.004
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 :9
  • Pages :1003-1016
  • Received Date : 2026-03-31
  • Revised Date : 2026-05-06
  • Accepted Date : 2026-06-16
  • DOI :https://doi.org/10.3741/JKWRA.2026.59.9.1003
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