SUBMERGED BREAKWATER FOR USE AS A PERCH FOR SAND RETENTION

摘要

A breakwater that is formed from a plurality of modules (100), with each module including a base (102) suitable for supporting the module on the seabed, a gently sloping seaward face (104) extending above the base (102) from one end, and a sloping beachward face (106) extending above the base (102) from the opposite end. The tops of the seaward and backward face (104,106) meet to form a top section (108) and at the top portion of the beachward face (106) at the top section (108) there is a transversely disposed concave cutout (160) that extends across the beachward face (106). The cutout (160) causes backwash water to swirl in it which removes a significant amount of the nourishment sand that is in backwash water. The cutout (160) has two spaced apart vertically extending concave channels (162,164) that connect to respective openings (172,174) in the top of the module (100). The concave channels (162,164) direct backwash water through the openings (172,174) in the top of the module (100) and these high pressure streams allow backwash water to pass seaward over the breakwater but significantly reduces the amount of nourishment sand in the backwash that passes over the breakwater (100) to seaward. IMAGE