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http://dx.doi.org/10.9798/KOSHAM.2011.11.2.103

Assessment of the Effect of Geographic Factors and Rainfall on Erosion and Deposition  

Yu, Wan-Sik (충남대학교 공과대학 토목공학과)
Lee, Gi-Ha (충남대학교 건설방재연구소)
Jung, Kwan-Sue (충남대학교 공과대학 토목공학과)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.11, no.2, 2011 , pp. 103-112 More about this Journal
Abstract
This study aims to demonstrate the relationship between various factors and soil erosion or deposition, simulated from distributed rainfall-sediment-runoff model applications. We selected area, overland flow length, local slope as catchment representative characteristics among many important geographic factors and also used the grid-based accumulated rainfall as a representative hydro-climatic factor to assess the effect of these two different types of factors on erosion and deposition. The study catchment was divided based on the Strahler's stream order method for analysis of the relationship between area and erosion or deposition. Both erosion and deposition increased linearly as the catchment area became larger. Erosion occurred widely throughout the catchment, whereas deposition was observed at the grid-cells near the channel network with short overland flow lengths and mild slopes. In addition, the relationship results between grid-based accumulated rainfall and soil erosion or deposition showed that erosion increased gradually as rainfall amount increased, whereas deposition responded irregularly to variations in rainfall. Within the context of these results, it can be concluded that deposition is closely related with the geographic factors used in this study while erosion is significantly affected by rainfall.
Keywords
Erosion and deposition; Distributed rainfall-sediment-runoff model; Geographic factors; hydro-climatic factor;
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Times Cited By KSCI : 4  (Citation Analysis)
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