Magazine of the Korean Society of Agricultural Engineers (한국농공학회지)

The Korean Society of Agricultural Engineers (한국농공학회)
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L-THIA/NPS to Assess the Impacts of Urbanization on Estimated Runoff and NPS Pollution

도시화에 따른 유출과 비점원 오염 영향을 평가하기 위한 L-THIA/NPS

  • Kyoung-Jae Lim (Department of Agricultural and Biological Engineering, Purdue University) ;
  • Bernard A. Engel (Department of Agricultural and Biological Engineering, Purdue University) ;
  • Young-Sug Kim (Korea Institute of Construction Technology(KICT)) ;
  • Joong-Dae Choi (Division of Agricultural Engineering, Kangwon National University) ;
  • Ki-Sung Kim (Division of Agricultural Engineering, Kangwon National University)
  • Published : 2003.07.01
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Abstract

The land use changes from non-urban areas to urban areas lead to the increased impervious areas, consequently increased direct runoff and higher peak runoff. Urban areas have also been recognized as significant sources of Nonpoint Source (NPS) pollution, while agricultural activities have been known as the primary sources of NPS pollution. Many features of the L-THIA/NPS GIS, L-THIA/NPS WWW system have been enhanced to provide easy-to-use system. The L-THIA model was applied to the Little Eagle Creek (LEC) watershed in Indiana to evaluate the accuracy of the model. The L-THIA/NPS GIS estimated yearly direct runoff values match the direct runoff separated from U.S. Geological Survey stream flow data reasonably. The $R^2$ and Nash-Sutcliffe values are 0.67 and 0.60, respectively. The L-THIA estimated runoff volume and total nitrogen loading for each land use classification in the LEC watershed were computed. The estimated runoff volume and total nitrogen loading in the LEC watershed increased by 180% and 270% for the 20 years. Urbanized areas -"Commercial", "High Density Residential", and "Low Density Residential"- of the LEC watershed made up around 68% of the 1991 total land areas, however contributed more than 92% of average annual runoff and 86% of total nitrogen loading. Therefore, it is essential to consider the impacts of land use change on hydrology and water quality in land use planning of urbanizing watershed.nning of urbanizing watershed.

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