Rehabilitation of Submerged Breakwaters by Using Wave Screens

Document Type : Original research papers

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Irrigation and Hydraulics Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt.

Abstract

Submerged breakwaters are widely used because of their economic, environmental, and aesthetic advantages. However, sea level rise and excessive settlement cause a reduction in wave attenuation and breakwater efficiency. So, the rehabilitation of submerged breakwaters efficiency is considered one of the important issues in the field of harbor engineering and shore protection. Wave screens can be used for this purpose due to their considerable advantages, as their construction is inexpensive, easy and requires less material, time, and space. Also, they are considered an environmental friend solution as they do not obstruct water flow or fish passage. An experimental investigation was executed to determine the impact of the settlement of submerged breakwaters on their efficiency and investigate the influence of placing the wave screens above the breakwater to enhance its efficiency.  The results showed that the reduction of the relative height of the breakwater by 10 % and 20 % decreases the efficiency by 10 % and 37.5% respectively. Also, the used single wave screen improved the efficiency by 19.3% and the screen porosity had a significant impact on the breakwater efficiency. However, the screen position had an insignificant influence on rehabilitation.  In addition, the double wave screens increased the breakwater efficiency by 16.40%. Finally, placing the wave screen above the tested breakwater was better than using it in front of the breakwater and more economic.

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