Expected Overtopping Probability Considering Real Tide Occurrence

摘要

A new calculation method of expected overtopping probability ofrubble mound breakwater considering real tide occurrence has beenproposed.A calculation method of expected overtopping probability of rubblemound breakwater was proposed by Kweon and Suh (2003). In theircalculation, the fluctuation of tidal elevation was expressed by thesinusoidal change that yields the uniform distribution of occurrencefrequency.However, the realistic distribution of tidal elevation should influence onthe overtopping chance. In this study, the occurrence frequency of tidalelevation obtained from the real sea is included. The tidal elevationused in this study is collected from the east coastal part of Koreanpeninsular. Analyzing the annual data of the tidal fluctuation measuredhourly during 355 days, the distribution of occurrence frequency isformulated utilizing by the normal distribution with one peak.Among the calculation procedures of annual maximum wave height,wave height-period joint distribution, wave run-up height andoccurrence frequency of tide, only the annual maximum wave height isagain chosen randomly from normal distribution to consider theuncertainty.It is found that the inclusion of the variability of tidal elevation hasgreat influence on the computation of the expected overtoppingprobability of rubble mound breakwater. The bigger standard deviationof occurrence frequency is, the lower the overtopping probability ofrubble mound breakwater is.