TWO-DIMENSIONAL NUMERICAL SIMULATION MODEL FOR UNIFYING DEBRIS FLOW AND SEDIMENT SHEET FLOW

Abstract

The present study deals with deposition-erosion processes of debris flow with transition between fully dispersed debris flow and sediment sheet flow. A two-layer flow model proposed by the authors was applied to twodimensional numerical simulation of debris flows, and simple numerical experiments were carried out. It was indicated that a two-dimensional numerical simulation using the two-layer flow model can analyze phenomena in which velocity directions of upper-layers of water flows are different form that of lower layers of sediment-water mixture flow.