Swell attenuating device for protecting places e.g. harbors, has raft with perforations on part of its surface and placed between perpendicular upstream and downstream edges extended at their base by stubs of same determined length

摘要

The device has a horizontal plate submerged in incident sea swell and maintained in a position under the free surface of water by stretched cables (24) or rods anchored on the sea-bed. The plate has perpendicular upstream and downstream edges (12, 14) extended at their base by stubs (12A, 14A) of same determined length. A raft (10A) laid between the edges, has perforations (20) on a part of its surface.