2022 Volume 78 Issue 2 Pages I_25-I_30
A model was developed to accurately assess the risk of waterlogged inland flooding caused by the inability to drain rainfall due to the closure of sluice gates caused by rising river water levels. The analysis was conducted for Setagaya City, Tokyo. It was found that if rainfall increases by a factor of 1.13 to 1.15 due to climate change, the area inundated above floor level increases by a factor of 1.22 to 1.27. Comparing multiple rainfall patterns, the results show that at the end of this century, up to 2.9 m of inundation occurred during a 200-year rainfall event. It was also found that the damage caused by 1/100th and 1/150th of the current rainfall would increase to 1/50th of the current frequency by the end of this century. Furthermore, it was shown that the social impact would be further aggravated by prolonged sluice gate closure times.
PROCEEDINGS OF HYDRAULIC ENGINEERING
