Efficiency and Wave Run-Up of Porous Breakwater with Sloping Deck

In order to protect fragile shoreline and coastal assets during extreme storms, a combined floating breakwater-windbreak has been proposed reduce both wind wave energies in the sheltered area. The 1 km-long breakwater porous hull with internal tubes allow free passage of water; thereby further dissipating energy. deck structure is designed have slope 25 degrees facing upstream side, arrays cylindrical are placed on sloping form windbreak. A reduced-scale (1:50) model test was carried out flume examine sheltering performance under significant heights Hs = 3.0 m 7.5 peak periods Tp 9.4 s 14 sea states. Both regular random conditions different were considered. It found that transmission coefficients ranging from 0.4 0.6 can be achieved tested conditions. Porous increases dissipation effective reducing reflection at side. run-up length dependent Iribarren number if reduction induced by vertical freeboard Based experimental data, empirical formulae predict responses waves, probability non-zero occurrence, modified Weibull distribution peaks waves.