There are many fishing ports facing the trouble that any plan composed of only the conventhional protective facilites is deemed functionally difficult to cope with long-period waves which generate peculiar flow called “Abiki”(secondary undulation) and so forth. Such secondaryundulation causes collision between the moored fishing bouts in the mooring basin and also cutting-off of the mooring ropes.
In constructhion of the breakwater for Ijima fishing port in Anann City of Tokushima Prefecture, the wave-control gate newly developed against long-period waves was taken into consideration as the most effective construction method and thus the study on its concept, advantage and structure was carried out.
