Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Evaluation of Sediment Yield using Area-weighted Measured Slope and Slope Length at HeaAn Myeon Watershed

실측 경사장 및 경사도를 고려한 양구 해안면 유역의 유사량 평가

  • Yoo, Dongseon (Department of Regional Infrastructure Engineering, Kangwon University) ;
  • Kim, Ki-Sung (Department of Regional Infrastructure Engineering, Kangwon University) ;
  • Jang, Won Seok (Department of Regional Infrastructure Engineering, Kangwon University) ;
  • Jun, Mansig (National Kangwon Development Research Institute) ;
  • Yang, Jae E. (Department of Biological Environment, Kangwon University) ;
  • Kim, Seong Chul (Department of Biological Environment, Kangwon University) ;
  • Ahn, Jaehon (National Institute of Highland Agriculture, Rural Development Administration) ;
  • Lim, Kyoung Jae (Department of Regional Infrastructure Engineering, Kangwon University)
  • 유동선 (강원대학교 지역건설공학과) ;
  • 김기성 (강원대학교 지역건설공학과) ;
  • 장원석 (강원대학교 지역건설공학과) ;
  • 전만식 (강원발전연구원) ;
  • 양재의 (강원대학교 자원생물환경학과) ;
  • 김성철 (강원대학교 자원생물환경학과) ;
  • 안재훈 (농촌진흥청 고령지농업연구소) ;
  • 임경재 (강원대학교 지역건설공학과)
  • Received : 2008.06.11
  • Accepted : 2008.08.05
  • Published : 2008.09.30
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Abstract

In this study, area-weighted slope and slope length module, considering measured field slope and slope length of the agricultural fields within the subwatershed, was developed using the ArcView Avenue programming to reflect the field topography of the Soil and Water Assessment Tool (SWAT) HRU in simulating the hydrology and water quality. Flow and sediment yield estimated values of the SWAT were compared with and without applying area-weighted slope and slope length module, developed in this study. There was 103% increases in estimated sediment with area-weighted slope and slope length module for the study watershed. The soil erosion and sediment yield from only agricultural field in Hae-an watershed was also assessed. There are 111% increase in estimated soil erosion and 112% increase in estimated sediment by applying area-weighted slope and slope length module. This study shows that the area-weighted slope and slope length module needs to be utilized in estimating the HRU field slope and slope length for accurate estimation of soil erosion and nonponit source pollutant modeling with the SWAT although it is not feasible to measure topographic information for every agricultural fields within the watershed. The area-weighted slope and slope length module can be used in identifying soil erosion hot spot areas for developing cost effective and efficient soil erosion management practices.

Keywords

Acknowledgement

Grant : 한강 수계 탁수저감 대책 마련을 위한 연구

Supported by : 한강수계관리위원회

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