Author(s): Ryoji Okabe; Mitsuhiro Terada; Taisuke Ishigaki; Taira Ozaki; Keiichi Toda
Keywords: Heavy rainfall; Vulnerability of underground space to flood; Inundation of subway stations and tunnels; Evacuation from inundated subway
Abstract: Japan has mega cities such as Tokyo, Nagoya and Osaka where are partially below sea level and these areas are prone to floods. There are numerous underground spaces such as subways and shopping malls. The vulnerability of subway to extreme pluvial flood is investigated by numerical methods in densely urbanized area, Osaka, Japan. It is found that up to 39%of flooded water would flow into underground spaces if no counter measures were taken. As platforms of 16 stations would be inundated, stakeholders should consider the damage in the event of inundation by fluvial flood, tsunami and storm surge.