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http://dx.doi.org/10.14481/jkges.2020.21.4.5

Assessment of Soil Erosion and Sedimentation in Cheoncheon Basin Considering Hourly Rainfall  

Kim, Seongwon (Emergency Management Institute, Kyungpook National University)
Lee, Daeeop (Emergency Management Institute, Kyungpook National University)
Jung, Sungho (Department of Disaster Prevention and Environmental Engineering, Kyungpook National University)
Lee, Giha (Department of Construction & Disaster Prevention Engineering, Kyungpook National University)
Publication Information
Journal of the Korean GEO-environmental Society / v.21, no.4, 2020 , pp. 5-17 More about this Journal
Abstract
In recent years, the frequency of heavy rainfall associated with high rainfall intensity has been continuously increasing due to the effects of climate change; and thus also causes an increase in watershed soil erosion. The existing estimation techniques, used for the prediction of soil erosion in Korea have limitations in predicting the: average soil erosion in watersheds, and the soil erosion associated with abnormal short-term rainfall events. Therefore, it is necessary to consider the characteristics of torrential rainfall, and utilize physics-based model to accurately determine the soil erosion characteristics of a watershed. In this study, the rainfall kinetic energy equation, in the form of power function, is proposed by applying the probability density function, to analyze the rainfall particle distribution. The distributed rainfall-erosion model, which utilizes the proposed rainfall kinetic energy equation, was utilized in this study to determine the soil erosion associated with various typhoon events that occurred at Cheoncheon watershed. As a result, the model efficiency parameters of the model for NSE and RMSE are 0.036 and 4.995 ppm, respectively. Therefore, the suggested soil erosion model, coupled with the proposed rainfall-energy estimation, shows accurate results in predicting soil erosion in a watershed due to short-term rainfall events.
Keywords
Rainfall kinetic energy; Raindrop distribution; Physics-based erosion model; Short-term rainfall;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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