Perforated screen seawall was considered as one of the multi function coastal structures that can be dissipating the wave energy and reducing both the reflected wave height and the wave run-up/run-down simultaneously. Physical model with 1:20 geometric scale has been conducted in 16 m length, 1.20 m width and 1.00 m high of a wave flume to simulate the models. Three models are distinguished on the perforated screen density ie. S = 0.5B; S = B and S = 1.5B (S is spacing perforated gaps and B is width of the closing part) set in a slope of 45?? have been simulated by 3 variations of wave height and wave length (Hi & L). The results indicated that the higher density of the perforated screen rising the wave dissipation capability, minimizing both the wave reflection and run-up/run-down. Wave steepness parameter (Hi/L) and the density of perforation (S/B) either individually or jointly in non dimensional parameter is significantly influenced on wave reflection and dissipation. The maximum deduction of wave run-up about 30% - 60% by high to low density of perforated screen founded in around 2.5 of Irribaren numbers. The Empirical obtained equations for Kd and Kr both in relationship with BHi/SL and the curves of Ru/H and Rd/H in the relationship with IrS/B can be used for prototypes design purpose.
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