JEMS Maritime Sci. Ahead of Print: JEMS-82698

Experimental and Numerical Study on the Hydrodynamic Efficiency of Permeable Caissons barriers

Karim Badr Hussein¹, Mohamed Ibrahim Mohamed², samah Hassan mahmoud^3
1Karim Badr Hussein Associate Professor in Civil Engineering Department, Faculty of Engineering, Al-Azhar University, Egypt
²Mohamed Ibrahim Associate Professor in Civil Engineering Department, Faculty of Engineering, Al-Azhar University, Egypt
³Samah H. Abd El Ghany Associate Professor in Civil Engineering Department, Higher Technological Institute (HTI), 10th of Ramadan City, Egypt

Breakwaters are constructed to protect beaches and ports from high storms and waves. By bringing calm to the port, breakwaters also increase ship safety and operation. This paper presents a study of the breakwater partially submerged in water, consisting of precast concrete caissons suspended on a spaced pile, experimentally and numerically, to assess the efficacy of hydrodynamics. A set of scenarios were simulated for the proposed breakwater using FLOW-3D numerical modeling. It turned out that the coefficient of wave transmission (Kt) increases with relative barrier draft and decreases with relative breakwater width. When the waves impacting breakwater are relatively short, their effectiveness rises. As the seafloor slope increases, kt decreases. The suggested breakwater disperses the waves and reduces the wave speed behind it. The wave velocities and vortices surrounding the breakwater decrease as the wave period (T) increases. In front of the barrier and at the wave crest, hydrodynamic pressure is at its peak. The numerically simulated results using FLOW-3D program are consistent with the experimental results.

Keywords: Breakwater, Coastal, Caissons, FLOW-3D, Pile System, Waves, Numerical Model

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