豪雨による洪水・土石流の発生を想定したマルチ・ハザードと避難判断基準に関する研究

抄録

Multi-environment zones (i.e. areas with various geographical risk factors) have very high potential for disaster. In addition, recent natural disasters have occurred due to complex sets of factors according to the debris flow and urban inundation in multiple-environment zones of urban areas with high and low mountainous areas. In order to mitigate these disasters more effectively by a countermeasure, it is necessary to investigate what causes damage from natural disasters. However, it is very difficult to predict disasters in the foreseeable future as well as to analyze the cause of disasters. Therefore, emergency evacuation system should be established by feedback from past disasters. The objectives of this study are to estimate the risk evaluation index according to 2-D debris flow with 2-D urban inundation models, to determine the PMP (probable maximum precipitation) and run-off discharge due to the DAD (Depth- Area-Duration) analysis to estimate the external force condition. Finally, multi-hazard risk maps, evacuation plans and evacuation route maps combining both disasters according to the emergency evacuation scenario (EES) are proposed by a Geographic Information System (GIS).