In cold-region estuaries a massive tsunami can cause the break-up of river-ice cover, the transport ofice floes and consequent collisions between them and riverine structures. This study conducted a series oflaboratory experiments on large tsunami with ice floes to clarify the characteristics of wave force with icefloes on a bridge girder. The results showed that the presence of ice floes can cause water level rise higherdue to the blockage of the bridge compared with the case without ice cover. In addition, when the ice waspresent, a larger wave force was generated and continued until the wave dissipated. Temporal variationsin the wave force were affected by the amount of ice; a large amount of ice caused an abrupt increasein the wave force, while a small amount of ice caused the wave force to increase more slowly. The dragcoefficients were increased 1.5- to 2-fold because of the ice floe, which indicates that the bearing shoes ofthe bridges need to be strong enough to withstand the extra pressure.
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