Author(s): F. E. Hicks; C. Bonneville
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Keywords: No Keywords
Abstract: This paper presents the preliminary results of an experimental study of ice jam consolidation events in which stable ice jams, formed in a laboratory flume under steady flow conditions, were subjected to step discharge increases. Water level, ice thickness, and velocity measurements taken during the resulting shoving events provide infoon. ation about the temporal and spatial variations in discharge and ice thickness that result during ice jam evolution. Particle tracking shows that when the entire ice cover is mobilized the rate of consolidation varies through the accumulation, decreasing towards the toe of the jam. Based on the experiments to date it appears that sudden discharge increases do not necessarily result in shoving, often thickening by under ice transport dominates. It also appears that the momentum of incoming ice plays a significant role in initiating actual shoving events, and may perhaps be more important than discharge increases.
Year: 1998