Session6: Water-related Disaster Risk Reduction
Title: SUBWAY INUNDATION AND WHHELCHAIR USER EVACUATION DURING TSUNAMI BY NANKAI TROUGH EARTHQUAKE
Yuhei Shoda, Taisuke Ishigaki, Tomohiro Yasuda
Cabinet office of Japan issued that Nankai trough earthquake will occur near future and it will bring high level tsunami to urban area. In urban area, people use subway and underground spaces. These areas are likely to be inundated by tsunami and it will be very dangerous. So, people must evacuate from subway stations or underground spaces after tsunami warning. However, it is very hard for wheelchair users to evacuate from underground spaces. Elevators are not available after earthquake so that people must carry wheelchair users through stairs. West area of Osaka city is low-lying area. So, this area is prone to inundation by tsunami. In this paper, inundation depth and starting time of flood water intruding into subway stations are calculated by 2D shallow water model. Lead time for safe evacuation was figured out and safety evacuation for wheelchair users was also investigated. From the results it is found that lead time is too short to make a safe evacuation at some stations. This means that appropriate evacuation plan for wheelchair users should be made as soon as possible.