CONSIDERATION ON A SIMPLE ESTIMATION METHOD FOR INUNDATION ON WHARF DUE TO WAVE OVERTOPPING

Abstract

 While sea level rise and power enhancement of tropical cyclone due to climate change are apprehended, both estimation and countermeasures for inundation on port facilities are widly concerned nowadays. Especially, in the wharf which is insufficiently sheltered from offshore waves, it may be required to consider an inundation risk due to wave overtopping, appropriately. In this study, both the formulae apploximating the diagram of wave overtopping rate on revetment and the equivalent coefficient of seawall height are applied to estimate inundation due to wave overtopping on the wharf, which is located in a port facing to the Pacific Ocean, and the mitigating effects of countermeasures setting front/back parapet on the wharf is considered, for example. Moreover, the validity of these considerations is confirmed by comparing the results of model experiment in a flume and the results of numerical simulation using a Boussinesq model in which a wave overtopping boundary model is equipped.

 The applied estimation method can estimate not only the quay wall height required to satisfy allowable wave overtopping rate but also the wave overtopping rate reduced by the front/back parapet setting on wharf, although both wave overtopping rate and inundation depth are somewhat overestimated while incient wave angle to the seawall is large.