Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Evaluation of Runoff Prediction from a Coniferous Forest Watersheds and Runoff Estimation under Various Cover Degree Scenarios using GeoWEPP Watershed Model

GeoWEPP을 이용한 침엽수림 지역 유출특성 예측 및 다양한 식생 피도에 따른 유출량 평가

  • Choi, Jaewan (National Institute of Environmental Research) ;
  • Shin, Min Hwan (Department of Regional Infrastructure Engineering, Kangwon National University) ;
  • Cheon, Se Uk (National Institute of Environmental Research) ;
  • Shin, Dongseok (National Institute of Environmental Research) ;
  • Lee, Sung Jun (National Institute of Environmental Research) ;
  • Moon, Sun Jung (National Institute of Environmental Research) ;
  • Ryu, Ji Cheol (Department of Regional Infrastructure Engineering, Kangwon National University) ;
  • Lim, Kyoung Jae (Department of Regional Infrastructure Engineering, Kangwon National University)
  • 최재완 (국립환경과학원 수질총량연구과) ;
  • 신민환 (강원대학교 지역건설공학과) ;
  • 천세억 (국립환경과학원 수질총량연구과) ;
  • 신동석 (국립환경과학원 수질총량연구과) ;
  • 이성준 (국립환경과학원 수질총량연구과) ;
  • 문선정 (국립환경과학원 수질총량연구과) ;
  • 류지철 (강원대학교 지역건설공학과) ;
  • 임경재 (강원대학교 지역건설공학과)
  • Received : 2011.02.24
  • Accepted : 2011.05.20
  • Published : 2011.07.30
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Abstract

To control non-point source pollution at a watershed scale, rainfall-runoff characteristics from forest watersheds should be investigated since the forest is the dominant land use in Korea. Long-term monitoring would be an ideal method. However, computer models have been utilized due to limitations in cost and labor in performing long-term monitoring at the watersheds. In this study, the Geo-spatial interface to the Water Erosion Prediction Project (GeoWEPP) model was evaluated for its runoff prediction from a coniferous forest dominant watersheds. The $R^2$ and the NSE for calibrated result comparisons were 0.77 and 0.63, validated result comparisons were 0.92, 0.89, respectively. These comparisons indicated that the GeoWEPP model can be used in evaluating rainfall-runoff characteristics. To estimate runoff changes from a coniferous forest watershed with various cover degree scenarios, ten cover degree scenarios (10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%) were run using the calibrated GeoWEPP model. It was found that runoff increases with decrease in cover degree. Runoff volume was the highest ($206,218.66m^3$) at 10% cover degree, whereas the lowest ($134,074.58m^3$) at 100% cover degree due to changes in evapotranspiration under various cover degrees at the forest. As shown in this study, GeoWEPP model could be efficiently used to investigate runoff characteristics from the coniferous forest watershed and effects of various cover degree scenarios on runoff generation.

Keywords

References

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