2024 Volume 80 Issue 17 Article ID: 24-17046
A study in Aichi Prefecture, Japan, assessed simultaneous storm surge and flooding in Mikawa Bay using typhoon track ensemble experiments. As a result, the largest storm surge peaked at 1.96m due to a northward-moving typhoon track along Mie Prefecture's coast. In addition, peak time differences between storm surge and river flood (ΔT) less than 3 hours showed overlapping storm surge and river flood peaks when typhoons passed west of Mikawa Bay, with an average ΔT of 48 minutes in the worst case. The Yagyu River had the highest potential for simultaneous occurrence. The impact of ΔT on coincidence was minimal for smaller rivers, increasing proportionally with typhoon distance. The assumed radii of maximum wind speed (RMW) of the typhoons were 70-105 km, and most of the river basins were within RMW for small and medium-sized rivers. As a result, the river was affected by heavy rainfall and storms, and storm surges and river floods were considered to have occurred simultaneously.
