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We carried out water level observation, video and aerial photography, and also visually monitored the river ice area. The phenomenon of ice jam became clear by this observation. The water level rapidly increased to 3.1 m in 2 hours due to the ice jam phenomenon. River ice size is large near ice jam occurrence point. And this size is small at an upstream point more distant than an ice jam occurrence point. River ice velocity before and after the occurrence of the ice jam was calculated by PIV analysis. The speed of river ice flow before and after the ice jam was determined by CCTV cameras. The maximum velocity of the river ice is 3.5 m/s. 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