JP2549752B

PURPOSE:To enhance functions for wave dissipation as well as for wave breaking by a method wherein first vertical wave-dissipating plates that dissipate, with dissipation holes, the waves on the outside of a bay and second vertical wave-dissipating plates that dissipate, with dissipation holes, the waves on the inside of the bay and vertical wave-breaking plates that break the waves arising from the inside and the outside of the bay are provided. CONSTITUTION:A first vertical wave-dissipating plate 24, equipped with a number of wave dissipation holes 36, a second vertical wave-dissipating plate 26, equipped with a number of wave dissipation holes 38, and a vertical wave-breaking plate 28 are connected with a plurality of cross beams 30, and are made integral to form a block body 22. Foundation piles 33 are driven in advance into specified positions on the seabed. The block bodies 22 are placed, with foundation guide rods 34 placed over the foundation piles, and are connected in the breadthwise direction, and a specified area in the sea is surrounded therewith to form a bay. Waves coming in from the open sea are dissipated with the wave-dissipating plates 24, and track waves produced in the bay are dissipared with the wave-dissipating plates 26 and, at the same time, the waves arising from the inside and the outside of the bay are broken with the wave-breaking plates 28. Thereby, it becomes possible to ensure calmness in the bay.