this addition is a wave attenuation device includes, according to the main patent, a plate (1) with low immergee maintained fixed on rigid supports (2).the upstream and downstream sides in the back to the top, so that the incident wave can propagate freely through the plate.a wall of water fixed "(4) is formed between the bottom (3) and the plate (1).the upper edge thereof includes a course (6) which reduces the width of the plate above a part and in the form of a tab (7).so that the upper edge (1a) has a primary side input decompose (1 ') and a secondary side (1 (a) above, the withdrawal of a specific distance (a) from the edge upper primarythe distance is chosen so as to reduce or cancel the amplitude of the ripple resulting from the combination of the components of the right of the input wave on primary (1 ').the cross component of (fi) and the components (fr, f1, f1) due to the presence of the device.
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