The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Submarine Discharge of Fresh Groundwater Through the Coastal Area of Korea Peninsula: Importance as a Future Water Resource

한반도 주변 연안 해저를 통한 담지하수의 유출: 미래 수자원으로서의 중요성

  • Hwang, Dong-Woon (Tidal Flat Research Institute, National Fisheries Research and Development Institute) ;
  • Kim, Gue-Buem (School of Earth and Environmental Sciences/RIO, Seoul National University) ;
  • Lee, Jae-Young (Marine Environment Policy Division, The Ministry of Land, Transport and Maritime Affairs)
  • 황동운 (국립수산과학원 갯벌연구소) ;
  • 김규범 (서울대학교 지구환경과학부) ;
  • 이재영 (국토해양부 해양환경정책과)
  • Received : 2010.07.25
  • Accepted : 2010.11.10
  • Published : 2010.11.30
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Abstract

Submarine groundwater discharge (SGD) has been recognized as a provider for freshwater, nutrients, and dissolved constituents from continents to the oceans and paid more attention with regard to the mass balance of water or dissolved constituents on local and global scales. The submarine discharge of fresh groundwater (fresh SGD) through seepage or springs in coastal ocean may be especially important in aspects of water resource and marine environment managements in the future. Based on the worldwide compilations of observed fresh SGD, our review reveals that fresh SGD occurs in various marine environments along most shoreline of the world and the global estimates of fresh SGD were approximately 0.01-17% of surface runoff. In addition, the input of fresh SGD calculated and investigated in this study were about 50%, 57%, 89%, and 420% of total river discharge in Jeju Island, Yeongil Bay, Masan Bay, and Yeoja Bay, respectively. These inputs from fresh SGD along the shoreline of Korea Peninsula are much higher than those of the whole world, greatly vary with the region. However, since these estimates are based on the water balance method mainly used in coastal ocean, we have to perform continuous monitoring of various parameters, such as precipitation, tide, evapotanspiration and water residence time, which have an impact on the water balance in a lot of areas for evaluating the precise input of fresh SGD. In addition, since the method estimating the input of fresh SGD has brought up many problems, it is required to make an intercomparison between various methods such as hydrogeological assumption, numerical modeling, and seepage meter.

해저지하수 유출은 최근 전 지구적인 혹은 지역적인 규모에서 육상의 담수, 영양염류 및 다른 용존 화학원소들을 해양으로 공급하는 중요한 역할을 담당하는 것으로 밝혀지고 있다. 특히, 해저를 통한 육상 담지하수의 해양으로의 유출은 해양환경학적 측면뿐만 아니라 미래 수자원 확보측면에서 매우 중요한 의미를 가진다. 일반적으로 해저를 통한 담지하수 유출은 전 세계 연안해역에서 일어나고 있으며, 그 양은 지역 또는 측정 방법에 따라 강물 유출량의 0.01-17% 범위인 것으로 보고되고 있다. 본 연구에서 조사 및 계산된 한반도 주변 해저 담지하수의 유출량은 제주도, 영일만, 마산만, 여자만 지역에서 주변 강물 유출량의 약 50%, 57%, 89%, 420%로 다른 나라의 연안 해역에 비해 상당히 양이 많고 지역적으로 큰 차이를 보였다. 하지만, 본 연구에서 이용한 담지하수 유출량 계산 방법은 연안해역에서의 기초적인 물수지 방법을 이용한 것으로, 보다 정확한 담지하수 유출량 평가를 위해서는 앞으로 연안해역에서 물수지에 영향을 미치는 여러가지 요인들(강수량, 조석, 증발, 물의 체류시간 등)의 시공간적 변화에 대한 지속적인 모니터링이 필요하다. 또한, 여전히 해저 담지하수 유출량을 평가하는데 있어서 방법적인 문제가 많이 제기되고 있는 만큼, 수리역학적인 방법 및 seepage meter를 이용한 실제측정 등을 통한 상호비교가 요구된다.

Keywords

Acknowledgement

Grant : 저서동물군집을 이용한 생태계 평가기법 연구

Supported by : 국립수산과학원

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