Abstract
In flow and sedimentation processes of the debris flow, an approach by considering particles motion and motion of water individually is more appropriate. This study has presented such a numerical calculation method by using the distinct element method (DEM) coupled with flow analysis and has analyzed the development of debris flow through the erosion process of bed-layer caused by the dam break. Especially, we focus on the effects of grain rotational motion and its friction on the debris flow simulation and find that when rotational motion of particles is not considered, total erosion volume in bed layer decreases. It is also shown that the appropriate spin motion considering rolling friction was indispensable for the DEM simulation of debris flow.
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