The breakwater, from wave breaker to wave catcher

Abstract

The function of breakwater as a wave energy breaker needs to be changed into a coastal protection that can capture wave energy. Such Innovation is important for the maritime state that un-renewable energy was in critical deposit. This study examines the magnitude of the wave energy that can be captured through the slope breakwater over-topping. This research was conducted by physical model simulations at the Laboratory of Coastal Engineering, Department of Civil Engineering, Hasanuddin University.Physical model simulation 1:20 in geometric scale have been performed under regular wave conditionsto simulate six types of structure model where differ in slope and height of free-board.The results showed an over-topping discharge (q) is significantly influenced by the parameters of the breakwater free-board relative to the wave height (Rc/Hi), the slope of the structure (tan α) and wave steepness (Hi/Lo). The result of over-topping discharge (q) equation was found smaller thanthe Van Der Meer result in the breaker parameter (zp)less than 2, while in the zp higher than 2, the rate of qis much larger than the Van Der Meer rate. The power efficiency achievement is about 7.4% on averagefor zpsmaller than2, while the power efficiency for zphigher than 2 is about 34% in average.

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