Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Application of Snowmelt Parameters and the Impact Assessment in the SLURP Semi-Distributed Hydrological Model

준 분포형 수문모형 SLURP에서 융설매개변수 적용 및 영향 평가

  • 신형진 (건국대학교 대학원 사회환경시스템공학과) ;
  • 김성준 (건국대학교 생명환경과학대학 사회환경시스템공학과)
  • Published : 2007.08.31
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Abstract

The purpose of this paper is to prepare snowmelt parameters using RS and GIS and to assess the snowmelt impact in SLURP (Semi-distributed Land Use-based Runoff Process) model for Chungju-Dam watershed $(6,661.5km^2)$. Three sets of NOAA AVHRR images (1998-1999, 2000-2001, 2001-2002) were analyzed to prepare snow-related data of the model during winter period. Snow cover areas were extracted using 1, 3 and 4 channels, and the snow depth was spatially interpolated using snowfall data of ground meteorological stations. With the snowmelt parameters, DEM (Digital Elevation Model), land cover, NDVI (Normalized Difference Vegetation Index) and weather data, the model was calibrated for 3 years (1998, 2000, 2001), and verified for 1 year (1999) using the calibrated parameters. The average Nash-Sutcliffe efficiencies for 4 years (1998-2001) discharge comparison with and without snowmelt parameters were 0.76 and 0.73 for the full period, and 0.57 and 0.19 for the period of January to May. The results showed that the spatially prepared snow-related data reduced the calibration effort and enhanced the model results.

본 연구는 충주댐 유역을 대상으로 SLURP 모형에서 RS, GIS를 이용한 융설매개변수 적용 및 영향을 평가하고자 한다. 모형의 음설 관련 매개변수 준비를 위해 3 set (1998-1999, 2000-2001, 2001-2002)의 NOAA AVHRR 위성영상을 분석하였다. 적설분포면적은 채널 1번, 3번, 4번을 이용하여 추출하였고, 적설심은 지상기상관측소의 적설심 자료를 이용하여 공간적으로 내삽하여 추출하였다. 융설 매개변수와 DEM, 토지피복도, NDVI, 수문기상자료를 이용하여 3개년도(1998, 2000, 2001)의 일별유출량을 모의하여 보정하였다 그리고 보정된 매개변수를 이용하여 1개년도(1999)를 검증하였다. 4년(1998-2001)동안의 유량 비교 결과, 평균 Nash-Sutcliffe의 모형 효율은 0.76이고 적설 및 융설 기간(1월$\sim$5월)동안의 평균 모형 효율은 0.57이다. 융설매개변수 미고려시 평균 Nash-Sutcliffe의 모형 효율은 0.73이고 적설 및 융설 기간(1월$\sim$5월)동안의 평균 모형 효율은 0.19이다. 융설매개변수를 포함한 유출량이 융설매개변수를 포함하지 않은 경우보다 관측유량의 수문시계열적 특성을 잘 표현하는 결과를 보였다.

Keywords

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