Abstract
Excessive production of frazil ice in rivers may lead to the occurrence of ice jams and attendant flooding during winter. An often‐discussed means of minimizing frazil‐ice production, and thereby for mitigating frazil jams, is regulation of river flow in order to facilitate rapid ice‐cover formation. A numerical model of ice‐cover formation by frazil‐ice accumulation over stage‐regulated pools is exercised to assess the durations of flow‐discharge regulation that would be required for ice covers to form over river pools of diverse length, regulated downstream depth, and channel slope. The numerical model indicates that for a given navigation pool, there exists an optimum river discharge that corresponds to a minimum time required for an ice cover to form. Optimal discharge is a function of pool length, channel slope, and downstream flow depth, but is invariant with air temperature.
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