LABORATORY MODEL EXPERIMENT ON TSUNAMI WAVE FORCE CHARACTERISTICS AFTER SEAWALL OVERTOPPING

Abstract

 Tsunami analyses based on 2D planar numerical models consider the flow preservation associated with overtopping of seawalls, but do not take into account the 3D effect of water masses overtopping. It may underestimate the tsunami damage at just behind the seawall. In this study, the wave forces around the seawall under three types of shapes, model heights and overtopping depths were estimated. It clarified that the water mass overtopping the erect-type seawall may cause more damage to the inside land than that of slope-shaped seawall, and that the maximum flow velocity was estimated around at the behind seawall. Furthermore, the results of scale model experiments were converted to real scale to calculate the wave force on 2-stories house. And, it was clarified that the combination of seawall shape, seawall height and overtopping depth showed the differences of the extent of house damage.