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2023 Vol.33, Issue 1 Preview Page

Research Article

Application of Flux Average Discharge Equation to Assess the Submarine Fresh Groundwater Discharge in a Coastal Aquifer

연안 대수층의 해저 담지하수 유출량 산정을 위한 유량 평균 유출량 방정식의 적용

Il Hwan Kim1
,
Min-Gyu Kim2
,
Il-Moon Chung3
,
Gyo-Cheol Jeong4
,
Sunwoo Chang5*
김 일환1
,
김 민규2
,
정 일문3
,
정 교철4
,
장 선우5*
1Postdoctoral Researcher, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology
2Research Specialist, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology
3Senior Research Fellow, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology
4Professor, Department of Earth and Environmental Sciences, Andong National University
5Senior Researcher, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology
1한국건설기술연구원 수자원하천연구본부 박사후연구원
2한국건설기술연구원 수자원하천연구본부 전임연구원
3한국건설기술연구원 수자원하천연구본부 선임연구위원
4안동대학교 지구환경과학과 교수
5한국건설기술연구원 수자원하천연구본부 연구위원
*Corresponding Author
31 March 2023. pp. 105-119
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Abstract

Water supply is decreasing due to climate change, and coastal and island regions are highly dependent on groundwater, reducing the amount of available water. For sustainable water supply in coastal and island regions, it is necessary to accurately diagnose the current condition and efficiently distribute and manage water. For a precise analysis of the groundwater flow in the coastal island region, submarine fresh groundwater discharge was calculated for the Seongsan basin in the eastern part of Jeju Island. Two methods were used to estimate the thickness of the fresh groundwater. One method employed vertical interpolation of measured electrical conductivity in a multi depth monitoring well; the other used theoretical Ghyben-Herzberg ratio. The value using the Ghyben-Herzberg ratio makes it impossible to accurately estimate the changing salt-saltwater interface, and the value analyzed by electrical conductivity can represent the current state of the freshwater-saltwater interface. Observed parameter was distributed on a virtual grid. The average of submarine fresh groundwater discharge fluxes for the virtual grid was determined as the watershed’s representative flux. The submarine fresh groundwater discharge and flux distribution by year were also calculated at the basin scale. The method using electrical conductivity estimated the submarine fresh groundwater discharge from 2018 to 2020 to be 6.27 × 106 m3/year; the method using the Ghyben-Herzberg ratio estimated a discharge of 10.87 × 106 m3/year. The results presented in this study can be used as basis data for policies that determine sustainable water supply by using precise water budget analysis in coastal and island areas.

Keywords
coastal aquifer
submarine fresh groundwater discharge
flux average discharge equation
Jeju Seongsan

기후 변화에 따라 용수 공급량은 줄어들고 있으며, 해안 및 도서지역은 지하수의 의존도가 높아 활용 가능한 용수의 양이 줄어들고 있다. 지속 가능한 해안 도서 지역의 물 공급을 위해 현재의 상태를 정확히 진단하고 효율적인 용수의 배분 및 관리가 필요하다. 해안 도서 지역의 지하수 흐름의 정밀한 분석을 위해 제주 동부의 성산유역을 대상으로 해안 담지하수 유출량을 산정하였다. 중요 매개변수인 담수층의 두께의 산정은 다심도 관측공에서 측정되는 전기전도도를 이용하여 수직적인 보간을 통해 추정하는 방법과 Ghyben-Herzberg의 이론적인 비율을 이용하여 추정하는 방법을 사용하였다. Ghyben-Herzberg의 비율을 사용한 값은 변화하는 담-염수 경계면의 정밀한 추정이 불가능하며, 전기전도도로 분석한 값은 담-염수 경계면의 현재 상태를 나타낼 수 있다. 매개변수는 가상의 격자에 분포시키고, 각각의 격자에 대한 해안 담지하수 유출 유량의 평균을 유역 대표 유량으로 결정하였다. 유역 규모의 연도별 해안 담지하수 유출량 산정과 유량 분포를 나타냈으며, 2018년에서 2020년까지의 해안 담지하수 유출량은 전기전도도로 추정한 담수층의 두께를 적용한 방법은 6.27 × 106 m3/year, Ghyben-Herzberg의 비율을 적용한 방법은 10.87 × 106 m3/year로 나타났다. 본 연구에서 나타낸 결과는 해안 도서지역의 정밀한 물수지 분석 등을 이용하여 지속가능한 용수의 공급을 결정하는 정책의 근거 자료로 활용할 수 있다.

키워드
연안 대수층
담해저 지하수 유출량
유량 평균 유출량 방정식
제주 성산
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 33
  • No :1
  • Pages :105-119
  • Received Date : 2023-03-03
  • Revised Date : 2023-03-27
  • Accepted Date : 2023-03-28
  • DOI :https://doi.org/10.9720/kseg.2023.1.105
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