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"Long swell" which attacked Toyama Bay from February 23 to 24, 2008, serious damaged breakwaters at FushikiToyama Port. We used the wave prediction model which considered data assimilation to predict offshore wave. And we calculated wave transformation in a shallow water using Boussinesq-type wave transformation model (NOWT-PARI for short). We combined these both of them and built the prediction model of "Long Swell" at Fushiki-Toyama Port. To improve the precision of the made prediction model of "Long Swell", we built the wave watch system. We showed that a prediction of "Long-Swell" is possible to use wave prediction model and a wave watch system.

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