Abstract
Coastal works where the tranquillity requirements are low porous pile breakwaters are considered as a good cost-effective substitute for the conventional type of breakwaters. In this study, an experimental investigation has been carried out in a two-dimensional wave flume to study the wave interaction with vertical pile breakwater. At 50 cm still water depth (h), interactions between regular waves (wave period T = 1.5 sec, 1.6 sec, 1.8 sec and 2.0 sec) and the pile breakwater of two different porosity (n = 0.65 and 0.80) and three different structure heights (hb = 40 cm, 50 cm and 60 cm) have been studied experimentally. Experimental results reveal that, minimum transmission coefficient (Kt = 0.55) is obtained for breakwater with lowest porosity (n = 0.65) and with emerged condition (hb/h = 1.2) for short wave period (T = 1.5 sec). Minimum reflection coefficient is obtained for breakwater with highest porosity (n = 0.80) and with submerged condition (hb/h = 0.8). It is also noticed that porosity has an effect on wave energy loss coefficient.
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