The bigger standard deviation of occurrence frequency is, the lower the overtopping probability of rubble mound breakwater is. It is found that the inclusion of the variability of tidal elevation has great influence on the computation of the expected overtopping probability of rubble mound breakwater. The rubble mounted breakwater Model is made from a pile of stone measuring D50 0.725 cm with a slope of 1:2, subsequently in simulated with 3 different types of wave height ( H) in the ranges of 6 cm to 10 cm and wave period T in the ranges of 1.3 s to 1.8 s) at 2 kind of water depth ( d 17.5 cm and D 19.5 cm). Among the calculation procedures of annual maximum wave height, wave height-period joint distribution, wave run-up height and occurrence frequency of tide, only the annual maximum wave height is again chosen randomly from normal distribution to consider the uncertainty. Analyzing the annual data of the tidal fluctuation measured hourly during 355 days, the distribution of occurrence frequency is formulated utilizing by the normal distribution with one peak. The tidal elevation used in this study is collected from the east coastal part of Korean peninsular. In this study, the occurrence frequency of tidal elevation obtained from the real sea is included. However, the realistic distribution of tidal elevation should influence on the overtopping chance. Rubble mound breakwaters behave as a static granular system until wave energy is higher than the one needed for the initiation of movement. In their calculation, the fluctuation of tidal elevation was expressed by the sinusoidal change that yields the uniform distribution of occurrence frequency. Introduction Damage in rubble mound breakwaters can be defined as the partial or total loss of its functionality and it is usually related to the hydraulic instability of the armor layer 1,2. The physical model of scale factor 1/30, was designed in such a way so it resembles part of a system of detached breakwaters located parallel to the shoreline, in a coast of constant slope 1/. A calculation method of expected overtopping probability of rubble mound breakwater was proposed by Kweon and Suh (2003). In the present study, the flow induced by waves around a physical model of a detached low crested rubble mound breakwater is investigated experimentally. Assessing the interaction of waves and porous offshore structures such as rubble mound breakwaters plays a critical role in designing such structures optimally. A new calculation method of expected overtopping probability of rubble mound breakwater considering real tide occurrence has been proposed.
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