Abstract
Soil erosion and sediment has been known as one of pollutants causing water quality degradation in water bodies. With global warming issues worldwide, various soil erosion studies have been performed. Although on-site monitoring of sediment loss would be an ideal method to evaluate soil erosion condition, modeling approaches have been utilized to estimate soil erosion and to evaluate various best management practices on soil erosion reduction. Although the USLE has been used in soil erosion estimation for the last 40 years, the USLE model has limitations in estimating event-based soil erosion reflecting rainfall intensity and rainfall duration for long-term period. Thus, the calibrated model, capable of simulating soil erosion using hourly rainfall data, was utilized in this study to evaluate the effects of rainfall amount and rainfall intensity on soil erosion. It was found that USLE soil erosion value is <TEX>$3.06ton\;ha^{-1}\;yr^{-1}$</TEX>, while soil erosion values from 2006~2010 were <TEX>$2.469ton\;ha^{-1}\;yr^{-1}$</TEX>, <TEX>$0.882ton\;ha^{-1}\;yr^{-1}$</TEX>, <TEX>$1.489ton\;ha^{-1}\;yr^{-1}$</TEX>, <TEX>$2.158ton\;ha^{-1}\;yr^{-1}$</TEX>, <TEX>$1.602ton\;ha^{-1}\;yr^{-1}$</TEX>, respectively. Especially, soil erosion from single storm event for 2008-2010 would be responsible for 30% or more of annual soil loss. As shown in this study, hourly soil erosion estimation system would provide more detailed output from the study area. In addition, the effects of rainfall intensity on soil erosion could be evaluated with this system.
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