Rajappa, S.Hegde, A.V.Rao, S.Channegowda, V.2026-02-052011Marine Technology Society Journal, 2011, 45, 5, pp. 20-27253324https://doi.org/10.4031/MTSJ.45.5.1https://idr.nitk.ac.in/handle/123456789/27188This paper presents the results of a series of physical model scale experiments conducted to determine the transmission characteristics of a horizontal interlaced, multilayered, moored floating pipe breakwater. The studies are conducted on physical breakwater models having five layers of PVC pipes. The wave steepness (H <inf>i</inf>/gT 2, where H <inf>i</inf> is incident wave height, g is acceleration due to gravity, and T is time period) was varied between 0.063 and 0.849, relative width (W/L, where W is width of breakwater and L is the wavelength) was varied between 0.4 and 2.65, and relative spacing (S/D, where S is horizontal centre to centre spacing of pipes and D is the diameter of pipes) was set equal to 2. The transmitted wave height is measured, and the gathered data are analyzed by plotting nondimensional graphs depicting the variation of K <inf>t</inf> (transmission coefficient) with Hi/gT 2 for values of d/W (d is depth of water) and of K <inf>t</inf> with W/L for values of H <inf>i</inf> /d. It is observed that K <inf>t</inf> decreases as H <inf>i</inf> /gT 2 increases for the range of d/W between 0.082 and 0.139. It is also observed that K <inf>t</inf> decreases with an increase in W/L values for the range of H <inf>i</inf> /d from 0.06 to 0.40. The maximum wave attenuation achieved with the present breakwater configuration is 78%.Acceleration due to gravityIncident wavesMulti-layeredNondimensionalPhysical modelPVC pipesRelative breakwater widthRelative spacingRelative wave heightTime-periodsTransmission characteristicsTransmission coefficientsTransmitted wavesWave attenuationWave steepnessFloating breakwatersModelsPolyvinyl chloridesWater wavesCoastal engineeringaccelerationbreakwaterfloating bodygraphical methodgravitymarine technologymooring systemnumerical modelpipepolymervibrationwave attenuationwave heightwave modeling