Author(s): Mehmet Secil Uzuner
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Keywords: No Keywords
Abstract: Problems associated with the extension of the navigation season to winter months in inland waterways and damage caused by ice jams have increased interest in and research on the understanding of the evolution of ice jams. It is important to understand the behavior of individual ice blocks in addition that of the whole cover. The latter behavior has been studied recently by Uzuner and Kennedy (1975) analytically and experimentally. Their theory was based on the force equilibrium of a fragmented ice cover. continuity equations for the liquid water and ice, the momentum relation for the flow, and strength thickness relations for the jam. There is, however, a possibility that ice jams thicken by means of floes being transported as "cover load" (after being submerged at the leading edge) for a distance, then being deposited there. The goal of the ensuing analysis is to develop an analytical framework for the incipient motion of an ice block resting under a floating ice cover, and to compare this with the submergence criterion at the leading edge to determine which mode of transport occurs at a lower velocity and/or Froude number. The critical conditions obtained from the analysis presented here are also compared to those for streamwise force balance (Ashton, 1974) of an ice block beneath the ice cover.
Year: 1975