Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Analysis of Soil Erosion Reduction Effect of Rice Straw Mat by the SWAT Model

SWAT 모형을 이용한 볏짚매트의 토양유실 저감효과 분석

  • 장원석 (강원대학교 지역건설공학과 대학원) ;
  • 박윤식 (강원대학교 지역건설공학과 대학원) ;
  • 최중대 (강원대학교 지역건설공학과) ;
  • 김종건 (강원대학교 지역건설공학과 대학원) ;
  • 신민환 (국립환경과학원 금강물환경연구소) ;
  • 류지철 (강원대학교 지역건설공학과 대학원) ;
  • 강현우 (강원대학교 지역건설공학과 대학원) ;
  • 임경재 (강원대학교 지역건설공학과)
  • Received : 2010.04.07
  • Accepted : 2010.05.12
  • Published : 2010.05.31
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Abstract

The purpose of this study is to evaluate sediment yield reduction under various field slope conditions with rice straw mat. The Vegetative Filter Strip Model-W (VFSMOD-W) and Soil and Water Assessment Tool (SWAT) were used for simulation of sediment yield reduction effect of rice straw mat. The Universe Soil Loss Equation Practice factor (USLE P factor), being able to reflect simulation of rice straw mat in the agricultural field, were estimated for each slope with VFSMOD-W and measured soil erosion values under 5, 10, and 20 % slopes. Then with the regression equation for slopes, USLE P factor was derived and used as input data for each Hydrological Response Unit (HRU) in the SWAT model. The SWAT Spatially Distributed-HRU (SD-HRU) pre-processor module was utilized, moreover, in order to consider spatial location and topographic features (measured topographic features by field survey) of all HRU within each subwatershed in the study watershed. Result of monthly sediment yield without rice straw mat (Jan. 2000 - Aug. 2007) was 814.72 ton/month, and with rice straw mat (Jan. 2000 - Aug. 2007) was 526.75 ton/month, which was reduced as 35.35 % compared without it. Also, during the rainy season (from Jun. to Sep. 2000 - 2007), when without vs. with rice straw mat, monthly sediment indicated 2,109.54 ton and 1,358.61 ton respectively. It showed about 35.60 % was reduced depending on rice straw mat. As shown in this study, if rice straw mat is used as a Best Management Practice (BMP) in the sloping fields, rainfall-driven sediment yield will be reduced effectively.

Keywords

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