Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Development of SWAT SD-HRU Pre-processor Module for Accurate Estimation of Slope and Slope Length of Each HRU Considering Spatial Topographic Characteristics in SWAT

SWAT HRU 단위의 경사도/경사장 산정을 위한 SWAT SD-HRU 전처리 프로세서 모듈 개발

  • Jang, Wonseok (Department of Regional Infrastructure Engineering, Kangwon University) ;
  • Yoo, Dongsun (Department of Regional Infrastructure Engineering, Kangwon University) ;
  • Chung, Il-moon (Korea Institute of Construction Technology) ;
  • Kim, Namwon (Korea Institute of Construction Technology) ;
  • Jun, Mansig (National Kangwon Development Research Institute) ;
  • Park, Younshik (Department of Regional Infrastructure Engineering, Kangwon University) ;
  • Kim, Jonggun (Department of Regional Infrastructure Engineering, Kangwon University) ;
  • Lim, Kyoung-Jae (Department of Regional Infrastructure Engineering, Kangwon University)
  • 장원석 (강원대학교 지역건설공학과) ;
  • 유동선 (강원대학교 지역건설공학과) ;
  • 정일문 (한국건설기술연구원) ;
  • 김남원 (한국건설기술연구원) ;
  • 전만식 (강원발전연구원) ;
  • 박윤식 (강원대학교 지역건설공학과) ;
  • 김종건 (강원대학교 지역건설공학과) ;
  • 임경재 (강원대학교 지역건설공학과)
  • Received : 2008.12.03
  • Accepted : 2009.01.24
  • Published : 2009.05.30
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Abstract

The Soil and Water Assessment Tool (SWAT) model, semi-distributed model, first divides the watershed into multiple subwatersheds, and then extracts the basic computation element, called the Hydrologic Response Unit (HRU). In the process of HRU generation, the spatial information of land use and soil maps within each subwatershed is lost. The SWAT model estimates the HRU topographic data based on the average slope of each subwatershed, and then use this topographic datum for all HRUs within the subwatershed. To improve the SWAT capabilities for various watershed scenarios, the Spatially Distributed-HRU (SD-HRU) pre-processor module was developed in this study to simulate site-specific topographic data. The SD-HRU was applied to the Hae-an watershed, where field slope lengths and slopes are measured for all agricultural fields. The analysis revealed that the SD-HRU pre-processor module needs to be applied in SWAT sediment simulation for accurate analysis of soil erosion and sediment behaviors. If the SD-HRU pre-processor module is not applied in SWAT runs, the other SWAT factors may be over or under estimated, resulting in errors in physical and empirical computation modules although the SWAT estimated flow and sediment values match the measured data reasonably well.

Keywords

Acknowledgement

Grant : 농촌 비점오염원 제어를 위한 효율적 관리기술 개발

Supported by : 환경부, 수자원

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