Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Development of the SWAT DWDM for Accurate Estimation of Soil Erosion from an Agricultural field

농경지에서 발생되는 토양유실의 정확한 산정을 위한 SWAT DWDM 개발

  • Jang, Won-Seok (Dept. of Regional Infrastructures Engineering in Kangwon National University) ;
  • Park, Youn-Shik (Dept. of Regional Infrastructures Engineering in Kangwon National University) ;
  • Kim, Jong-Gun (Dept. of Regional Infrastructures Engineering in Kangwon National University) ;
  • Kim, Nam-Won (Korea Institute of Construction Technology) ;
  • Choi, Joong-Dae (Dept. of Regional Infrastructures Engineering in Kangwon National University) ;
  • Ok, Yong-Sik (Dept. of Biological Environment in Kangwon National University) ;
  • Yang, Jae-E (Dept. of Biological Environment in Kangwon National University) ;
  • Lim, Kyoung-Jae (Dept. of Regional Infrastructures Engineering in Kangwon National University)
  • Published : 2010.01.31
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Abstract

준분포형 모형인 SWAT 모형은 소유역내 수문학적 반응단위 별로 유출, 유사 등의 발생을 평가하는데 이때 Hydrological Response Unit (HRU)의 지형정보가 활용된다. 현재 SWAT 모형의 인터페이스 구조는, 각 소유역의 평균 지형인자 값이 각 소유역내의 모든 HRU의 지형정보로 사용된다. 그러므로 각 소유역내의 HRU에 있는 지형인자를 정확하게 추출하기 위해서는 수계를 자세하게 나누어야 하며, 이를 위해서 더욱 자세한 소유역 수계 인터페이스가 필요하다. 현재 SWAT 모형 인터페이스에서는 수계를 나눌 때 임계값의 최소값은 최대 flow accumulation 값의 0.1 %가 사용된다. 따라서 HRU의 지형인자를 추출하기 위해 아주 자세한 정도로 소유역의 수계를 나눈다는 것은 불가능하다. 본 연구에서는 사용자가 원하는 임계값과 농경지 경계를 근거하여 소유역 경계를 추가로 수계를 나눌 수 있는 Dual Watershed Delineation Module (DWDM) 을 개발하였다. 기존 SWAT의 수계추출 모듈로 유량을 모의한 결과 $27,219\;m^3$/month 가 산정되었고, DWDM 을 적용한 결과 $26,172\;m^3$/month 로 약 3.8 %의 미미한 차이가 생겼다. 하지만 유사의 경우 DWDM을 적용하기 전에는 0.779 ton/month, 적용 후에는 2.688 ton/month 로 약 245 %의 차이를 보였다. 즉 농경지를 추가적으로 수계를 나눌 때 유사의 가장 민감한 요소인 경사장을 실제지형에 맞게 고려함에 따라 좀 더 정확한 유사 산정을 할 수 있었다. 농경지에서의 정확한 수문 및 유사 평가 시 본 연구에서 개발한 모듈이 적용 되어야 한다고 사료된다.

Keywords

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