Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Estimating Exploitable Groundwater Amount in Musimcheon Watershed by Using an Integrated Surface Water-Groundwater Model

지표수지하수 통합모형을 이용한 무심천 유역의 지하수 개발가능량 산정

  • Chung, Il-Moon (Water Resources Research Div. Korea Institute of Construction Technology) ;
  • Lee, Jeong-Woo (Water Resources Research Div. Korea Institute of Construction Technology) ;
  • Kim, Nam-Won (Water Resources Research Div. Korea Institute of Construction Technology)
  • 정일문 (한국건설기술연구원 수자원연구실) ;
  • 이정우 (한국건설기술연구원 수자원연구실) ;
  • 김남원 (한국건설기술연구원 수자원연구실)
  • Received : 2011.09.01
  • Accepted : 2011.10.10
  • Published : 2011.10.28
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Abstract

In Korea, groundwater management has been conducted based on the estimation of annual average of groundwater recharge. Since groundwater recharge and surface water-groundwater interactions show spatiotemporal variation, continuous monitoring and dynamic analysis must be carried out to evaluate the sustainability of groundwater resources. In this study, SWAT-MODFLOW, an integrated surface water-groundwater model was used to analyze surface-groundwater interactions for various groundwater pumping scenarios in Musimcheon watershed. When current usage is applied, the baseflow reduction is about 16%, and annual averaged storage reduction is about 27 mm for whole watershed. As a holistic approach to groundwater sustainability considers the hydrological, ecological, socioeconomic, technological aspects of groundwater utilization, the exploitable groundwater should be determined by physical analysis as well as social compromise in a community.

우리나라의 지하수관리는 연간 지하수 함양량을 기반으로 수행되어 왔으나 지히수 함양량과 지표수-지하수 상호작용은 시공간적으로 변동하는 양이므로 지속적인 모니터링과 동적인 분석을 통해 지하수자원의 지속가능성이 평가되어야 할 것이다. 본 연구에서는 무심천 유역을 대상으로 지표수-지하수 통합해석 모형인 SWAT-MODFLOW를 이용하여 다양한 지하수 양수 시나리오(무양수 및 현 이용량의 1~3배)에 대한 수문성분 해석을 수행하였다. 현 이용량으로 양수하는 경우가 비교적 지속가능한 개발량으로 판단되었는데 이때 연간 기저유출량은 16%, 대수층 저류량은 27 mm 감소하는 것으로 나타났다. 지하수의 지속가능성을 평가하기 위해서는 지하수 이용에 따른 수문학적, 생태학적, 사회 경제적, 기술적 영향을 평가하는 총체적 접근법이 도입되어야 하며 이를 위해서는 물리적인 분석과 함께 지역사회의 합의 또한 중요한 의사결정 방식이라고 판단되었다.

Keywords

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