offshore wave protection structures, stationary breakwaters, on the promenade of funchal, madeira

absorber accropod antiwave barrier block board break breaker breakwall breakwater builders concrete cutter cutwater debris defensewall form groyne industry jetty litter marine material merchant mole mound ocean offshore pier products protecting protection resistance rubblemound sea seacoast seawall shape shipping splash starling stone stormsurge structure tetrapods travelingwave wall wave wavebreaking zone