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정일문 ( Il Moon Chung ),나한나 ( Han Na Na ),이덕수 ( Deok Su Lee ),김남원 ( Nam Won Kim ),이정우 ( Jeong Woo Lee ),이재명 ( Jae Myung Lee ) 대한지질공학회 2011 지질공학 Vol.21 No.4
지하수 항양량은 기후조건, 토지이용, 수리지질학적 비균질성에 의해 시공간적인 변동성을 나타내는 수문량이므로 통합 지표수-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 함양량은 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. 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 ratc 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
정일문 ( Il Moon Chung ),이정우 ( Jeong Woo Lee ),김지태 ( Ji Tae Kim ),나한나 ( Han Na Na ),김남원 ( Nam Won Kim ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.10
In Jeju island, runoff has frequently happened when the rainfall depth is over a threshold value. To simulated this characteristic rainfall-runoff model structure has to be modified. In this study, the TRSM (Threshold Runoff Simulation Method) was developed to overcome the limitations of SWAT in applying to the hydrologic characteristics of Jeju island. When the precipitation and soil water are less than threshold value, we revised the SWAT routine not to make surface/lateral or groundwater discharge. For Hancheon watershed, the threshold value was set as 80% of soil water through the analysis of rainfall-runoff relationship. Through the simulation of test watershed, it was proven that TRSM performed much better in simulating pulse type stream flow for the Hancheon watershed.