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An experimental study is conducted to develop stepped submerged offshore breakwaters as wave energy dissipater for shoreline protection. The erosion or accretion of shoreline along sandy beaches comes to be a big problem for sustainable development. Through this research, the author tries to find out a new shape of submerged breakwater to minimize the required area occupied by the breakwater, reduce the construction cost and improve the performance of the proposed new shape. The experimental work was adopted for significant cases of submergence ratio, structural and hydraulic parameters of stepped submerged breakwater. This is adopted under normal and regular waves with wide ranges of wave’s heights and periods under constant water depth. The efficiency of the breakwaters is presented as a function of transmission and wave energy loss coefficients. The results represented that, the slotted stepped submerged breakwaters are more effective than without slotted ones in terms of reduction of transmitted waves in case of B/h > 1, as well as B/L > 0.39. Furthermore, Lower wave transmission and higher energy loss are obtained consistently at the lower submergence depth ratio.

Stepped Submerged Offshore Breakwaters for Wave Energy Dissipation