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Analysis on Characteristics of Sediment Produce by Landslide in a Basin 1. Simulation of Sediment Produce and its Verification  

Yoo, Chul-Sang (고려대학교 공과대학 건축.사회환경공학과)
Kim, Kee-Wook (노스캐롤라이나 주립 아팔라치안 대학교 지질학과)
Kim, Seong-Joon (건국대학교 생명환경과학대학 사회환경시스템공학과)
Lee, Mi-Seon (건국대학교 대학원 지역건설환경공학과)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.10, no.3, 2010 , pp. 133-145 More about this Journal
Abstract
This study analyzed the characteristics of sediment produce by landslide triggered by rainfall. One-dimensional unsaturated groundwater model and infinite slope stability analysis were used to estimate the behavior of soil moisture and slope stability according to rainfall, respectively. Slope stability analysis was performed considering on soil depth and characteristics of trees. As the results considering on recovery of the failed slopes, much amount of sediment was produced in 1963, 1970, and 2002. As the results of verification of simulation results using Landsat 5 TM images, we can find differences of landslide location between the results from model and satellite images. These differences can be caused by uncertainties of the rough parameters in the model. However, in the case that Obong-dam basin was divided into two subbasin, Wangsan-chun and Doma-chun basin, the results of each subbasin show errors around 20%. And only 4% of error occurred in the case of comparing landslide area on the entire Obong-dam basin. These errors seem insignificant considering on the errors which can be caused from the analyses in this study such as estimation of sediment produce, soil cover classification, and estimation of landslide area.
Keywords
landslide; characteristics of sediment produce; one-dimensional unsaturated groundwater modeling; slope stability analysis;
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Times Cited By KSCI : 2  (Citation Analysis)
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