2021 Volume 77 Issue 2 Pages I_277-I_282
Due to sea level rise caused by global warming and the intensification of typhoons, it is feared that storm surges will exceed the designed high tide level in the future. In this study, we evaluate the impact of rising of seawalls on storm surge inundation characteristics in order to discuss hardware mitigation measures against storm surge. Rising of seawalls reduces the overflow into the protected lowland by seawalls, and the sea water level rises due to the increase of sea water retained in the sea area. In this case, the water level rise in the sea area is larger at the inner part of the bay than the mouth of the bay due to the influence of the wind-driven surge. Therefore, it is suggested that the overflow volume may increase in the area facing the inner part of the bay, which may cause the inundation depth in the protected lowland to increase. In addition, the disaster mitigation effect of rising of seawalls was found to be different among municipalities.
