• Hydrogeological Characterization of Groundwater and Surface Water Interactions in Fresh-Saline Water Mixed Zone of the East Coast Lagoon Area, Korea
  • Woo-Hyun Jeon·Dong-Hun Kim·Soo-Hyoung Lee·Seho Hwang·Hee Sun Moon*·Yongcheol Kim

  • Groundwater Research Center, Geological Environment Research Division, Korea Institute of Geoscience and Mineral Resources

  • 동해안 석호 담염수 혼합대에서 지하수와 지표수 상호작용의 수리지질학적 특성 평가
  • 전우현·김동훈·이수형·황세호·문희선*·김용철

  • 한국지질자원연구원 지질환경연구본부 지하수연구센터

  • 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.

Abstract

This study examined hydrogeological characteristics of groundwater and surface water interaction in the fresh-saline water mixed zone of East Coast lagoon area, Korea, using several technical approaches including hydrological, lithological, and isotopic methods. In addition, the fresh-saline water interface was evaluated using vertical electrical conductivity (EC) data. For this purpose, three monitoring wells (SJ-P1, SJ-P2, and SJ-P3) were installed across the Songji lagoon at depths of 7.4 to 9.0 m, and water level, EC, and temperature at the wells and in the lagoon (SJ-L1) were monitored using automatic transducers from August 1 to October 21, 2021. Isotopic composition of the groundwater, lagoon water, and sea water were also monitored in the mid-September, 2013. The mixing ratios calculated from oxygen and hydrogen isotopic composition decreased with increasing depth in the monitoring wells, indicating saline water intrusion. In the study area, the interaction of groundwater-surface water-sea water was evident, and residual salinity in the sedimentary layers created in the past marine environment showed disorderly characteristics. Moreover, the horizontal flow at the lagoon's edge was more dominant than the vertical flow.


Keywords: Groundwater and surface interaction, Electrical conductivity, Stable isotopes, Songji lagoon, Seawater intrusion, Groundwater-dependent ecosystems

This Article

  • 2021; 26(6): 144-156

    Published on Dec 31, 2021

  • 10.7857/JSGE.2021.26.6.144
  • Received on Dec 3, 2021
  • Revised on Dec 6, 2021
  • Accepted on Dec 14, 2021

Correspondence to

  • Hee Sun Moon
  • Groundwater Research Center, Geological Environment Research Division, Korea Institute of Geoscience and Mineral Resources

  • E-mail: hmoon@kigam.re.kr