Abstract
Numerical simulation model which can analyze flood flow in rivers and flood inundation inland region in integrally was developed and it was applied to the Arakawa River basin including Kawajima town. The flood inundation characteristics (inundation direction and time to reach at each primary evacuation site (here after PES)) were elucidated considering two inundation conditions (overtopping occurs from Ichinogawa river (Case A) and Tokigawa river (Case B)). The big difference for the inundation direction can be confirmed between Case A (from north to southeastern) and B (from northwest to southeastern).
Based on result of flood inundation model, optimum route of evacuation assistance bus was calculated for each inundation type. For Case A, to go around the western PES before overtopping and the eastern PES after overtopping minimized total evacuation time. In contrast, for Case B, to go around the northern PES firstly and the southern PES secondly was optimum for reducing total evacuation time. This result indicates that inundation characteristics should be clarified for proposing effective evacuation plan.
