2024 Volume 80 Issue 16 Article ID: 23-16062
In recent years, record-breaking rainfalls and urbanization have caused inundation hazards in many parts of Japan. Hazard maps are used for evacuation in the event of inundation. However, conventional hazard maps generally show only the depth of inundation. Actual evacuation actions are affected by the flow velocity and evacuation distance. In this study, we defined a difficulty of evacuation in the event of internal inundation hazard as an indicator that includes more than just the depth of inundation. Furthermore, this study aimed to visualize and evaluate the difficulty of evacuation by applying it to the target area. Inundation simulations were conducted for several probability years. The difficulty of evacuation was evaluated for parameters related to walking in water, evacuation distance, and roads. The results showed that the difficulty of evacuation was smaller near evacuation sites and larger away from evacuation sites. The difficulty of evacuation varied with water depth and flow velocity for several probability years. The results suggest the possibility of visualization of new evacuation difficulty points.
