Gravity wave interaction with cage enveloped breakwaters using DBEM

Dual boundary element method-based numerical investigations are carried out on the wave reflection, transmission, and dissipation characteristics of a breakwater made porous cage filled with rocks. To assess hydrodynamic performance, we analyzed three different configurations (namely conventional trapezoidal shape, rectangular, inverted trapezoidal) by keeping volume rocks fixed for all configurations. An twin barrier is found to be efficient one reduce transmission. For practical range relative water depths in field, it that almost 25%–35% better reducing transmission when compared single rubble mound breakwater. It increasing number barriers tandem arrangement helps achieve coefficient less than 0.4 depth, required use h 1 / > 0.8 ${h}_1/h 0.8$ breakwater, where “h1” height “h” depth. The minimum porosity rock closer natural rocks, is, 0.4–0.5. If spacing between breakwaters S $S/h$ were 2, decreases an extent 5%–10%. present study useful design construction offshore wave-damping applications.