Assessment on Inundation Risk and Efficiency of Disaster Countermeasures in Coastal Urban Area by Numerical Simulation

Abstract

The risk of wave overtopping and overflowing is increasing in the waterfront of our country, because of the rise of mean sea level by global warming and the rise of the storm surge due to the typhoon scale increasing. In this research, three dimensional fluid analysis model is demonstrated for wave overtopping and inundation in coastal urban facilities facing to the Tokyo Bay, where the sea level rise and the wave height increase in the future is considered. Secondly, the change in inundation depth and flood time by countermeasures such as the recurved parapet and the drain is numerically estimated and the efficiency of such disaster countermeasures is quantitatively discussed. As a result, it is clarified that the recurved parapet and the drain delays the start time of flood in the ground and underground part.