計画土石流の設定と避難計画

Abstract

A numerical simulation method which can establish a designed debris flow hydrograph and hazards due to flooding of it under arbitrary basin and rainfall conditions are given.This method is consisted of one and two dimensional analysis. One dimensional analysis can evaluate a debris flow developing process by erosion and deposition of gully bed by surface water runoff or supply of debris and water as a consequent of landslide. Whether landslides will occur or not is one of very important factors to generate a large-scale debris flow. The effects of the landslide location and the number of landslide to the generated debris flow hydrograph are investigated. Two dimensional analysis can evaluate the process of flooding and deposition of a debris flow. This method can identify hazardous zones, examine the safety of the refuge places and routes, and give useful information about mechanism of occurrence of the debris flow hazard to the residents. This method is verified by applying to an actual debris flow.