Abstract
Inundation process in underground space as well as on a ground surface in urban, which is caused by a heavy rainfall, was studied numerically. Considering the real data of (1) road network, (2) drainage network and (3) underground space in the area around Shinjuku Station, a simplified numerical model was developed. Based on the results, it was revealed that both the underground space and some local area whose ground elevation is relatively lower have the possibility to have a serious damage if there happens to be the rainfall whose intensity exceeds the designed one. Some more investigation was conducted to understand how we could mitigate the damage of inundation in underground space.
