The debris flow behavior by climate change in materials with coarse and fine sediments

초록

The purpose of this study is to observe the water-soil mixture of fine sediment particles and analyze its sediment volume concentrations at varying water supply as it flows in a channel at various slopes at the mountain district. The Finite Difference Method (FDM) is utilized and incorporates both the equation for fine and course sediments and the numerical model, an equation based on mass conservation and momentum conservation. In comparing the sediment concentrations at various slopes, the inflection point of the sediment volume concentration appeared as the slope steepened. In varying water supply, fluctuation occurred as the water supply increased, and the debris flow changed to laminar flow state while the sediments changed to a suspended state. The increasing moving rate of debris flow can be determined. In comparing the changes of saturated course sediment particles, highly concentrated sediments occurred as the length increased and thus the range of erosion stability must be determined for slope safety. © 2017 International Information Institute.

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