越流による破堤進行に及ぼす堤内地条件の影響

抄録

Hazard maps for flood dizasters, which can be used to estimate damage under a variety of scenarios, are made based on modeled levee breach processes. But acturally, the contitions of inundated area vary and it is possible that they affect the levee breach processes and their migration speed. In this study, numerical analysis of levee breach process including flow and sediment transport phenomena in inundated area. The effects of inundated area conditions, e.g. pavement cover, wood cover or building-urbanized condition, to levee breach processes and temporal change of flow and the shapes of levee and land are demonstrated. Wider wood area in front of levee makes progress of levee breach process about several minites slower. Density of wood affects to progress speed of breach strongly.