INUNDATION DAMAGES OF STORM SURGE AND HIGH WAVE AFFECTED BY DIFFERENCE IN EVALUATION METHODS OF BUILDINGS

Abstract

 There are two methods to consider effects of buildings in numerical simulation of inundation due to storm surges and high waves. One of the method is to include effects of buildings in roughness, and the other is to introduce occupancy rate and drag forces of buildings in the basic equations. The purpose of this study is to assess the two different methods by comparing the numerical outputs. We first performed numerical simulations of simplified virtual terrain with different overtopping rate and building occupancy rate. Thereby, we showed that inundation depth of the method using building occupancy rate is larger near the position of overtopping. They also indicated that the inundation process is affected by both overtopping rate and building occupancy rate. We then performed numerical simulations in Fuji coast. We showed that results obtained by the method using building occupancy rate had wider inundation area and espisially deeper inundation depth in most of the area.