Author(s): I. Mayer; Gy. Szepessy
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Keywords: No Keywords
Abstract: Starting from the Bernoulli and continuity equations familiar in hydraulics, an expression has been derived for estimating the highest rate ice flow capable of being conveyed through the contracted river section. The ice conveyance coefficient has been defined and quantified in terms of the contraction ratio, the size and length of the ice floes, the surface flow velocity and the extent of channel scouring. No actual prototype river section was modelled, so that the model had no specific scale. Around the contraction the gravity and inertia forces were assumed to become predominant, leading to the mass-correct reproduction of the ice floes as the dynamic criterion. Circular, rectangular and elliptical ice floes of 9 N/dm3 unit weight and constant thickness were applied in the model. From the studies an explicit expression emerged for estimating the highest rate of single-sheet ice flow (m^z /s) passing the contraction. The studies were extended to ice runs involving floes of different size. The several years long project has the aim of formulating a mathematical model suited to describing the processes involved in each of the three phases - running, arresting and jamming - of river ice flow.
Year: 1990