Author(s): F. Hara; T. Kawai; A. Imaizumi; H. Saeki; H. Yamaguchi
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Abstract: In February, 1994, an accident occurred in the Kotoni-Hassamu River in Sapporo. Because of a sudden swell in the river, a worker who was building a fishway in the river was carried away with the shovel-dozer he was operating. We started a field survey immediately after the accident and we have already reported an outline of the incident (Hara et al., 1994). According to our survey, we estimated that the accident was caused by an ice jam. Ice jams, defined as the cause in this case, are formations of lumps of drifting ice or ice sheets jamming the river channel. In this incident, an ice jam formed near the Choei Bridge, upstream from the construction site of the fishway, and collapsed after damming up drifting ice sheets and snow. After the collapse of the ice jam, water mixed with snow slush and ice flowed down the river channel in large quantities.
Year: 1996