• Quantitative Assessment of Coastal Groundwater Vulnerability to Seawater Intrusion using Density-dependent Groundwater Flow Model
  • Chang, Sun Woo*

  • Korea Institute of Civil Engineering and Building Technology, Gyeonggi-Do 10223, Korea

  • 분산형 해수침투 모델을 이용한 양적 지표 기반의 해안지하수 취약성 평가연구
  • 장 선 우*

  • 한국건설기술연구원

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


Extensive groundwater abstraction has been recognized as one of the major challenges in management of coastal groundwater. The purpose of this study was to assess potential changes of groundwater distribution of northeastern Jeju Island over 10-year duration, where brackish water have been actively developed. To quantitatively estimate the coastal groundwater resources, numerical simulations using three-dimensional finite-difference density-dependent flow models were performed to describe spatial distribution of the groundwater in the aquifer under various pumping and recharge scenarios. The simulation results showed different spatial distribution of freshwater, brackish, and saline groundwater at varying seawater concentration from 10 to 90%. Volumetric analysis was also performed using three-dimensional concentration distribution of groundwater to calculate the volume of fresh, brackish, and saline groundwater below sea level. Based on the volumetric analysis, a quantitative analysis of future seawater intrusion vulnerability was performed using the volume-based vulnerability index adopted from the existing analytical approaches. The result showed that decrease in recharge can exacerbate vulnerability of coastal groundwater resources by inducing broader saline area as well as increasing brackish water volume of unconfined aquifers.

Keywords: Seawater Intrusion (SWI), Brackish groundwater, Future Scenarios, Volumetric analysis, SWI Vulnerability, Recharge

This Article

  • 2021; 26(6): 95-105

    Published on Dec 31, 2021

  • 10.7857/JSGE.2021.26.6.095
  • Received on Nov 29, 2021
  • Revised on Dec 6, 2021
  • Accepted on Dec 14, 2021

Correspondence to

  • Chang, Sun Woo
  • Korea Institute of Civil Engineering and Building Technology, Gyeonggi-Do 10223, Korea

  • E-mail: chang@kict.re.kr