SUBWAY INUNDATION BY PLUVIAL FLOODING IN DENSELY URBANIZED AREA

Abstract

There are more than 640 subway stations in Japanese cities. These stations make up tunnel networks as seen in Tokyo, Nagoya and Osaka. In this paper, subway inundation in Osaka is discussed on the basis of numerical result in a case of extreme pluvial flooding. In the previous work, it was found that about 80 percent of intruding flooded water into the mega-underground mall comes down to subway tunnels. In this paper, it is the objective to investigate how the intruding water spreads across the subway network, and how is the leading time for safe evacuation at each stations. From the result, flooded water broadly spreads across in the subway network and the leading time is not enough for safe evacuation from subway stations.