Author(s): Robert V. Goldstein; Nikolai M. Osipenko

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Abstract: The results of mechanical modeling of broken ice motion in the river-channel during the ice drifting are given. The main elements of the process of ice jam formation-stoppage the ice motion in the river-channel are illustrated by simplified models. The river-channel is represented as a channel with parallel walls, while the moving ice – as an equivalent viscous-plastic medium. Two models of ice jam initiation were considered. In the first model the effect of stoppage of flow of ice entrained by the water stream, when a critical flow velocity is attained, was accounted for. In the second model the ice jam initiation is considered as the process related to force interaction in ice medium leading to ridging. Stoppage of the drifting ice in the hydrodynamic flow represents the necessary condition of ice jam initiation. The sufficient condition is related to ridging at the boundary of the retardation zone. It was shown that the sensitivity of the ice jam initiation mechanism to variation of the river-channel section decreases with increasing the flow velocity. Different schemes of ice jam initiation related to different initial conditions and variation of the ice flow parameters were presented. A series of problems interesting from the point of view of the mechanics of heterogeneous media was separated.

DOI:

Year: 2010