Transmission studies on horizontal interlaced multi-layer moored floating pipe breakwater (HIMMFPB) with three layers of pipes

Abstract

Present study consists part of the series of physical model scale experiments conducted for the study of the transmission characteristics of horizontal interlaced multi-layer moored floating pipe breakwater (HIMMFPB). Studies were conducted on physical models of the floating breakwater with three layers of PVC pipes, wave steepness, H<inf>i</inf>/gT2 (H<inf>i</inf>=incident wave height, g=acceleration due to gravity and T=wave period) varying from 0.063 to 0.936; relative width, W/L (W=width of the breakwater) varying from 0.4 to 2.65 and relative spacing of pipes, S/D=2 (S=horizontal c/c spacing of pipes and D=diameter of the pipes). Transmitted wave height is measured and the collected data is analyzed by plotting non-dimensional graphs depicting the variation of Kt (transmission coefficient) with H<inf>i</inf>/gT2for various values of d/W (d=water depth) varying from 0.082 to 0.276 and Kt with W/L for different values of H<inf>i</inf>/d which was varied from 0.06 to 0.450. It is observed that Kt decreases as H<inf>i</inf>/gT2 increases for the range of d/W values used in the study. It is also observed that Kt decreases with an increase in W/L for the range of H<inf>i</inf>/d values used. Maximum wave attenuation achieved in the study with the present breakwater configurations is 78.62%.