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Model Studies on Horizontal Interlaced Moored Floating Pipe Breakwater with Five Layers

Arkal Vittal Hegde, Kiran Kamath, J.C. Deepak

Abstract


The paper presents the results of model scale experiments on horizontal interlaced, multi-layer, moored floating pipe breakwater. Studies were conducted on models with five PVC pipe layers, wave steepness, Hi/L (Hi is incident wave height and L is incident wave length) varying from 0.0066 to 0.0464, relative width, W/L (W is width of breakwater) varying from 0.4 to 2.65 and relative spacing, S/D (S is horizontal spacing of pipes and D is diameter of pipe) of 4. The transmitted wave height was measured and analyzed by plotting non-dimensional graphs depicting the variation of transmission coefficient Kt with wave steepness, and for various values of d/W (d is depth of water) and also variation of transmission coefficient with relative width, and for different values of relative wave height Hi/d. The forces in the seaward side mooring were measured and analyzed by plotting non-dimensional graphs depicting the variation of force parameter f/gW2 (f is force in the mooring per unit length of the breakwater, g is weight density of seawater) with wave steepness, and for various values of d/W, also variation of force parameter with relative width, for different Hi/d values. It was observed that transmission coefficient decreased as wave steepness increased for the range of d/W values between 0.081 and 0.276. Transmission coefficient decreased with increase in relative width and maximum wave attenuation achieved with present breakwater configuration is 68.2%. Further, it was observed that the force in the seaward side mooring increases with increase in wave steepness for the range of d/W values between 0.081 and 0.276. The experimental results also reveal that forces in the seaward side mooring decrease as relative width increases for range of relative wave height between 0.06 and 0.40.

Keywords


Floating pipe breakwater, wave steepness, relative spacing, relative width, mooring force

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