INUNDATION PROCESS BOTH ON GROUND AND IN SUBWAY TUNNELS IN CENTRAL TOKYO ASSUMING A LARGEST TORRENTIAL RAIN

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  • 想定される最大級の豪雨を対象とした東京都心部の地上ならびに地下鉄トンネルの浸水プロセス

Abstract

<p> Extreme weather conditions caused by global warming have resulted in frequent floods in recent years. In the highly urbanized area of Tokyo, one of the most vulnerable areas for large-scale flood damage is underground space. Tokyo’s 23 wards have a network of underground tunnels connecting many underground stations, and floodwaters can easily spread through these tunnels. Previous studies have discussed the flooding process in subway tunnels under large-scale external force conditions. In this paper, a new method for estimating the inflow into a subway station entrance was investigated to predict the inundation process in subway tunnels. As a result, the inundation in the tunnel varied depending on the way of estimation used, indicating the importance of proper evaluation of the inundation depth at the entrance to the subway station. It was also confirmed that the installation of watertight panels is effective and that appropriate train deterrent measures are important.</p>

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