Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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Evaluation of Accuracy Improvement of SWAT Model for the Yongdam-Dam Watershed based on Multi-Point Hydrological Observations

용담댐유역의 다지점 유량관측 자료 이용에 따른 SWAT 모형의 정확도 향상성 평가

  • SHIN, Hyung-Jin (Rural Research Institute, Korea Rural Community Corporation) ;
  • PARK, Min-Ji (Han River Environment Research Center, National Institute of Environmental Research) ;
  • LEE, Ji-Won (Dept. of Civil and Environmental and Plant Engrg., Konkuk Univ) ;
  • HWANG, Eui-Ho (K-water Institute, Korea Water Resources Corporation) ;
  • KANG, Seok-Man (Rural Research Institute, Korea Rural Community Corporation) ;
  • CHAE, Hyo-Sok (K-water Institute, Korea Water Resources Corporation)
  • 신형진 (한국농어촌공사 농어촌연구원) ;
  • 박민지 (국립환경과학원 한강물환경연구소) ;
  • 이지완 (건국대학교 사회환경플랜트공학과) ;
  • 황의호 (한국수자원공사 K-water 융합연구원) ;
  • 강석만 (한국농어촌공사 농어촌연구원) ;
  • 채효석 (한국수자원공사 K-water 융합연구원)
  • Received : 2018.08.31
  • Accepted : 2018.09.20
  • Published : 2018.09.30
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Abstract

This study is to evaluate the accuracy improvement of the model using SWAT(Soil and Water Assessment Tool) model and multi - point hydrological observation data. The watershed is located in the Yongdam Dam($930.4km^2$), the Donghyang($165.5km^2$), the Chuncheon($290.9km^2$), the Juchun($57.8km^2$) and the Seokjeong($80.5km^2$). The watershed covers 70.0 % forest. In order to improve the accuracy of the model, precipitation data were used from two weather stations(Jangsu, Geumsan) and 16 AWS stations daily precipitation data(2003~2011) managed by KMA, MLIT, and K-water. Based on the reliable data of the Yongam test basin in 2003~2011, the runoff of single point (Yongdam dam) and multi-point (Donghyang, Chuncheon, Jucheon, Seokjeong). Simulation results show that the $R^2$ of the single subwatershed (Donghyang, Chuncheon, Jucheon, Seokjeong) is single point(0.84) and multipoint(0.88). For model efficiency coefficient of Nash-Sutcliffe at single point(0.45) and multipoint(0.70).

본 연구에서는 SWAT(Soil and Water Assessment Tool) 모형과 다지점 수문관측 자료를 이용하여 모형의 정확도 향상성을 평가하고자 한다. 대상유역은 한국수자원공사 용담시험유역의 수위자료를 측정하고 있는 용담댐($930.4km^2$), 동향($165.5km^2$), 천천($290.9km^2$), 주천($57.8km^2$), 석정($80.5km^2$) 유역으로 70%이상이 산림유역이다. 모형의 정확도를 향상시키기 위해 강수자료는 기상관측소 2개(장수, 금산)관측소와 기상청, 국토부, 수자원공사에서 관리하는 AWS 16개의 2003~2011년 일 강수량 자료를 이용하였다. 2003~2011년의 용담시험유역의 신뢰할만한 실측자료를 바탕으로 5지점의 일 유출량을 이용하여 단일지점(용담댐)과 다지점(동향, 천천, 주천, 석정)의 유출량을 검 보정하여 비교하였다. 모의 결과 단일지점의 소유역(동향, 천천, 주천, 석정)의 $R^2$는 0.84, 다지점은 0.88, 단일지점의 Nash-Sutcliffe의 모형효율계수 0.45, 다지점은 0.70으로 보다 향상된 모의 결과로 나타났다.

Keywords

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