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A Study on Transportation Characteristics of Debris dependent on Geologic Conditions  

Chae Byung-Gon (Korea Institite of Geoscience and Mineral Resources)
Kim Won-Young (Korea Institite of Geoscience and Mineral Resources)
Lee Choon-Oh (Korea Institite of Geoscience and Mineral Resources)
Kim Kyeong-Su (Korea Institite of Geoscience and Mineral Resources)
Cho Yong-Chan (Korea Institite of Geoscience and Mineral Resources)
Song Young-Suk (Korea Institite of Geoscience and Mineral Resources)
Publication Information
The Journal of Engineering Geology / v.15, no.2, 2005 , pp. 185-199 More about this Journal
Abstract
Properties of sliding materials are dependent on the lithology because debris is the product of rock weathering processes. In order to characterize transportation behavior of debris dependent of debris types, this study selected 26 debris flows over three areas composed with different rock weathering types and topographic conditions. Analyses of lithology, weathering, and topographic characteristics were performed by detailed field survey. Based on the field survey data, transportation behavior of debris was studied at the aspect of the relationship of grain size and volume of debris as well as topographic conditions. According to the study results, change of slope angle is very influential factor on runout distance of debris among the topographic factors. Because the sliding velocity and the energy of debris are frequently changed and more irregular on an undulating slope, the unout distance of debris is larger than that of an uniformly dipping slope. Runout distance of debris is also influenced by volume and grain size of debris. Volume of debris in the gabbro is four or five times larger than that of the granite area because it is controlled by the lithology. Considered with grain size distribution, runout distance of debris is longer in the gabbro area which is composed with irregular grain size bearing large corestones than that in the medium grained granite area.
Keywords
sliding material; transportation behavior of debris; lithology; change of slope angle; volume of debris; grain size;
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