The Journal of Engineering Geology (지질공학)

The Korean Society of Engineering Geology (대한지질공학회)
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Spatio-Temporal Variations in Groundwater Recharge in the Jincheon Region

진천지역 지하수 함양량의 시공간적 변동특성

  • Chung, Il-Moon (Water Resources Research Division, Korea Institute of Construction Technology) ;
  • Na, Han-Na (Water Resources Research Division, Korea Institute of Construction Technology) ;
  • Lee, Deok-Su (Water Resources Research Division, Korea Institute of Construction Technology) ;
  • Kim, Nam-Won (Water Resources Research Division, Korea Institute of Construction Technology) ;
  • Lee, Jeong-Woo (Water Resources Research Division, Korea Institute of Construction Technology) ;
  • Lee, Jae-Myung (Groundwater & Groundwater Investigation Team, Korea Water Resources Corporation)
  • 정일문 (한국건설기술연구원 수자원연구실) ;
  • 나한나 (한국건설기술연구원 수자원연구실) ;
  • 이덕수 (한국건설기술연구원 수자원연구실) ;
  • 김남원 (한국건설기술연구원 수자원연구실) ;
  • 이정우 (한국건설기술연구원 수자원연구실) ;
  • 이재명 (한국수자원공사 조사기획처 지하수지반사업팀)
  • Received : 2011.09.23
  • Accepted : 2011.11.22
  • Published : 2011.12.30
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Abstract

Because groundwater recharge shows spatial-temporal variability due to climatic conditions, it is necessary to investigate land use and hydrogeological heterogeneity, and estimate the spatial variability in the daily recharge rate based on an integrated surface-groundwater model. The integrated SWAT-MODFLOW model was applied to compute physically based daily groundwater recharge in the Jincheon region. The temporal variations in estimated recharge were calibrated using the observed groundwater head at several National Groundwater Monitoring Stations and at automatic groundwater-monitoring sites constructed during the Basic Groundwater Investigation Project (2009-2010). For the whole Mihocheon watershed, including the Jincheon region, the average groundwater recharge rate is estimated to be 20.8% of the total rainfall amount, which is in good agreement with the analytically estimated recharge rate. The proposed methodology will be a useful tool in the management of groundwater in Korea.

지하수 함양량은 기후조건, 토지이용, 수리지질학적 비균질성에 의해 시공간적인 변동성을 나타내는 수문량이므로 통합지표수-지하수 모델 기반의 시공간변동성을 갖는 일단위 함양량의 추정이 필요하다. 진천지역을 대상으로 SWAT-MODFLOW 통합모형이 일단위 함양량 추정에 사용되었으며 추정된 함양량의 시변성은 국가 지하수 관측망과 기초조사 기간(2009-2010)중에 설치된 자동관측망 자료와 잘 부합하는 것을 확인하였다. 진천지역을 포함한 미호천 유역 평균 지하수 함양률은 강수대비 20.8%로 나타났는데 이는 해석적 방법인 기저유출 분리법의 결과와도 잘 일치하였다. 통합모델링 기반의 함양량 산정은 국가 지하수 관리를 위해 유용하게 활용될 수 있을 것으로 판단된다.

Keywords

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