ANALYSIS METHOD FOR DEBRIS FLOW IN MOTION

摘要

PROBLEM TO BE SOLVED: To provide a highly accurate analysis method for debris flow conditions, taking into consideration the changes in pore fluid density caused by inclination of the riverbed etc.;SOLUTION: Concerning debris flow that contains pore water and sediment, in which the sediment comprises a fine grain component that functions in the same way as pore water and a larger grain component of grain sizes larger than the fine grains, the following processes are carried out: the displacement and speed of erosion and sedimentation on a riverbed 1 are calculated for each time step and each two-dimensional topographical mesh; based on the calculation results, a plan view of the sediment displacement conditions and sediment displacement that yields the sedimentation depth are analyzed; and the displacement and speed of erosion and sedimentation on the riverbed 1 are calculated taking into consideration the changes in the ratios of the fine grain component and the larger grain component contained in the sediment, which arise as the fine grain component travels on the riverbed 1.;COPYRIGHT: (C)2015,JPO&INPIT