STUDY ON DEBRIS FLOW BEHAVIOR IN A REGION AROUND A POINT OF ABRUPT SLPOE REDUCING

Abstract

Deposition process of debris flow has not been examined in detail in a region around a point of abrupt slope reducing though the process is very important for disaster prevention planning. Several experiments were carried out to investigate the process by measuring profiles of free surface, interface if it appears and bed and by tracing sand particle locus. The experimental results were compared with those of computation of a two-layer model proposed by the authors to show good agreement in case of movable bed surface condition in upstream reach and some discrepancy with fixed bed there. This discrepancy was somewhat improved by modeling the equation for equilibrium bed slope