抄録
Mega cities in Japan, for instance Tokyo, Nagoya or Osaka, are susceptible to floods, because they locate in lowlands which are below the flood water level of rivers. These areas are prone to floods caused by rainwater, river-water and sea-water. Some cities are fully urbanized, and underground shopping arcades and subway stations are there. These underground spaces are also flood-prone areas. In this paper, Tsunami flooding in underground space caused by the Nankai Trough Great Earthquake is discussed by using calculations of surface and underground inundation. Results show that entrance location of flooded water intrusion by Tsunami flooding is quite different from a pluvial flooding case and that the amount of inflow is very huge. This means that counter measures for underground inundation should be planned for each kind of flood disaster.
