Wave Transmission on Submerged Rubble Mound Breakwater Using L-Blocks

Laboratory tests on a permeable submerged rubble mound breakwater (SRMB) constructed using L-Blocks armour unit with 40 tests for wave transmission were analyzed and the available empirical equations for wave transmission coefficient (Kt) were evaluated. The ranges of variation were 0.23< ds /d<0.38, 0.001< Hi /(gT2) <0.022, 0.011< Hi /L<0.139, and 0.769<B/d<0.625 where B is the top width of the breakwater and L is the incident wave length. The design parameters varied systemically to investigate the impact of incident wave height (Hi), wave period (T), water depth (d), and submergence depth (ds) on the values of Kt. The tests were performed in a wave flume 23 m long and 1.5 m wide. The armor units were L-Block artificial armour unit with the relative density of 2.4. The results showed that for various relative submergence depth, ds/d, (i) little correlation was found when Kt correlate with B/d. (ii) Kt correlates well with wave steepness Hi /L and with Hi /(gT2). New data have been used in the assessment of
the four commonly used predictors of Kt and one of them was found to fit reasonably.