2025 Volume 81 Issue 16 Article ID: 24-16157
In coastal low-lying areas, there exist risks of fluvial and pluvial inundations, as well as by storm surge. Their simultaneous occurrences caused by typhoons could exacerbate the inundation risk, and that might be intensified under under the future climate. In this study, using pseudo-global warming climate simulations, we estimated the changes in the past typhoon under the future climates, and conducted integrated analyses of storm surges, fluvial and pluvial flooding. In the analysis focusing on the Katabira River, there was a tendency for high tides to increase while there was variability in the increase in precipitation. The deviation in tidal levels by storm surge, combined with the tidal ranges, increased the river water levels. Tidal variations in storm surges, which are considered to be long period oscilation, were observed, high-lighting the need to consider regional characteristics.
