HYDRAULIC EXPERIMENTS ON QUANTITY OF WAVE OVERTOPPING AND OVERFLOW THROUGH SEAWALL LINE IN STORM SURGE

Abstract

 Due to increasing risk of inundation in storm surges caused by climate change, it is necessary to consider both wave overtopping and overflow for inundation evaluation. Although some researches were conducted to examine the evaluation method of combined overtopping and overflow, it has not been established and the validation by the hydraulic experiments is necessary. The authors also conducted numerical experiments by OpenFOAM to consider overtopping-overflow discharge and inundation depth. In this study, hydraulic experiments were conducted to verify the accuracy of the numerical experiments and the evaluation method of overtopping-overflow discharge and the inundation level were examined. The validity of the numerical-experimental results was confirmed by means of the hydraulic experiments, and the applicability and problems of the existing formula to estimate overtopping-overflow discharge were clarified. The numerical experiments on the inundation depth in storm surge were also verified, and the equation to estimate the inundation level was updated. It can be also used for the levee with a parapet.