![]() ![]() 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. Results showed that the stable armor weight to maintain a probability of failure equal to 0.005 placed on a breakwater with 50-year life span under a 100-year design storm condition in the Caspian. 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. The dissipation of wave energy through absorbtion rather than reflection distinguishes rubble mound breakwaters from other types of fixed breakwater. The most important parameter in designing a breakwater is its armor design. The principal function of a rubble mound breakwater is to protect a coastal area from excessive wave action. However, the realistic distribution of tidal elevation should influence on the overtopping chance. In this section, a real breakwater is designed using two design approaches, a conventional one and an approach introducing joint analysis of the marine variables in the analysis, and results are compared. In their calculation, the fluctuation of tidal elevation was expressed by the sinusoidal change that yields the uniform distribution of occurrence frequency. 1.1.1 Components of a rubble mound breakwater A rubble mound breakwater is composed of core, berm, filter layer, armour layer and superstructure, cf. A calculation method of expected overtopping probability of rubble mound breakwater was proposed by Kweon and Suh (2003). A new calculation method of expected overtopping probability of rubble mound breakwater considering real tide occurrence has been proposed. A stretch of a rubble-mound breakwater (head and part of the adjoining trunk, with a slope of 1(V):2(H)) was built in a wave basin at the Leibnitz Universität Hannover to assess, under extreme wave conditions (wave steepness of 0.055) with different incident wave angles (from 40o to 90o), the structure behaviour in what concerns wave run-up. ![]()
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