2024 Volume 80 Issue 16 Article ID: 23-16074
Inundation simulations were carried out using a compound flood analysis model for considering simultaneous inundations, where rainwater flooding and river flooding (overflow flooding) occurred at the same time. The effect of simultaneous inundations on evacuation was investigated using the unit width specific force M as an indicator. The results showed that during the simultaneous inundations, 1) the area exceeding the limit value of M, which is the criterion for safe evacuation of elderly women, adult women/elderly men, and adult men, expands, 2) evacuation places that cannot be evacuated may occur, and 3) it is necessary to start evacuation earlier, and 4) the duration of evacuation at the evacuation places becomes longer. These results indicate that it is important to consider the simultaneous inundations for safer evacuation during heavy rainfall, since the simultaneous inundations make the risk of evacuation increase.
