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Evaluation of Sediment Yield Prediction and Estimation of Sediment Yield under Various Slope Scenarios at Jawoon-ri using WEPP Watershed Model  

Choi, Jaewan (Geum River Environment Research Center)
Hyun, Geunwoo (Gangwondo Government Public Institute of Health & Environment)
Lee, Jae Woon (Geum River Environment Research Center)
Shin, Dong Suk (National Institute of Environmental Research)
Kim, Ki-Sung (Department of Regional Infrastructure Engineering, Kangwon National University)
Park, Younshik (Department of Regional Infrastructure Engineering, Kangwon National University)
Kim, Jonggun (Department of Regional Infrastructure Engineering, Kangwon National University)
Lim, Kyoung Jae (Department of Regional Infrastructure Engineering, Kangwon National University)
Publication Information
Journal of Korean Society on Water Environment / v.25, no.3, 2009 , pp. 441-451 More about this Journal
Abstract
To evaluate the soil erosion best management practices, many computer models has been utilized over the years. Among those, the USLE and SWAT models have been widely used. These models estimate the soil erosion from the field using empirically-based USLE/MULSE in it. However, these models are not good enough to estimate soil erosion from highland agricultural watershed where severe storm events are causing soil erosion and muddy water issues at the receiving watersheds. Thus, physically-based WEPP watershed version was applied to a watershed, located at Jawoon-ri, Gangwon with very detailed rainfall data, rather than daily rainfall data. Then it was validated with measured sediment data collected at the sediment settling ponds and through overland flow. In this study, very detailed rainfall data, crop management data, soil data reflecting soil reconditioned for higher crop production were used in the WEPP runs. The $R^2$ and the EI for runoff comparisons were 0.88 and 0.91, respectively. For sediment comparisons, the $R^2$ and the EI values were 0.95 and 0.91. Since the WEPP provides higher accuracies in predicting runoff and sediment yield from the study watershed, various slope scenarios (2%, 3%, 5.5%, 8%, 10%, 13%, 15%, 18%, 20%, 23%, 25%, 28%, 30%) were made and simulated sediment yield values were analyzed to develop appropriate soil erosion management practices. It was found that soil erosion increase linearly with increase in slope of the field in the watershed. However, the soil erosion increases dramatically with the slope of 20% or greater. Therefore special care should be taken for the agricultural field with slope greater than 20%. As shown in this study, the WEPP watershed version is suitable model to predict soil erosion where torrential rainfall events are causing significant amount of soil loss from the field and it can also be used to develop site-specific best management practices.
Keywords
Runoff; Sediment yield; Slope; Soil erosion; WEPP;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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