Abstract
When tsunami damaged the coastal structures of Kuki fishing port, the 1/4 wave length, 1/4 wave period and wave height was 30m, 2sec and 7m, respectively. Besides, based on the video analysis, it is noted that bore wave occurred near Hironai Bridge. Both of its horizontal acting force and vertical acting force were more than twice of the girder resistance force of Hironai Bridge, which coincided with the damage situation.
