Abstract

 
 
 Floating breakwaters are commonly used to protect shorelines, marine structures and harbors from wave attacks. Through the physical model test method, the wave energy dissipation performance by using porous floating cylindrical breakwater under regular waves. This research content in this paper for a horizontal cylindrical pipe with different diameters and with different percentage of porosity working as a single pipe or as a group. Which contains five different models with diameters (2 inch, 3 inch, 4 inch, (3&4 inch together) and (2, 3 & 4 inch together) by choosing different percentage of porosities (15, 30 & 50%) to achieve maximum energy dissipation with minimum transmitted energy. The experiments were carried out in a recirculating open channel flume located at the Hydraulics Engineering Laboratory, Higher Institute of Engineering in El Shorouk City.
 
 
Highlights
As a wave resisting structure, breakwaters are widely used in port fairways, bathing places, wharves a yachts, and its structural form has great influence on ship navigation, water exchange, wave attenuation and wave reduction in offshore engineering
Traditional gravity breakwaters in deep-water areas are faced with problems such as high foundation requirements, difficult construction and high cost in very deep water
The effect of the porous media on the incoming waves has in recent years gained attention with the use of advanced numerical models as discussed for example by Garcia et al, (2004), Jacobsen et al, (2015), Jensen et al, (2014), Losada et al, (2005)
Summary
As a wave resisting structure, breakwaters are widely used in port fairways, bathing places, wharves a yachts, and its structural form has great influence on ship navigation, water exchange, wave attenuation and wave reduction in offshore engineering. The cost is less affected by water depth, the foundation is more adaptable, and the construction is relatively convenient It is more suitable for sea areas with high tidal range, soft soil bed and deep waters. Wang and Sun, (2010) examined a porous breakwater where the structure was fabricated with large numbers of diamond-shaped blocks arranged to reduce transmitted wave height and the mooring force. Their results showed that the porous FB reduced transmission of a large part of the incident wave energy through dissipation rather than reflection of the wave energy.
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