Author(s): Numa Marcotte
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Keywords: No Keywords
Abstract: Mathematical modelling of the thermal and ice regime of rivers is described and applied to the St. Lawrence river in the region of Montreal. Results of measurements and simulations are compared. A brief description of the general method of study is presented together with the basic thermal budget method. Interaction between heat exchanges, water temperature, ice formation and ice deterioration is then examined in more detail. Two types of ice are considered with more emphasis: anchor ice and moving sheet ice. The following points are of particular interest. One more term is added to the thermal budget to express the use of supercooling for the formation of frazil and anchor ice. Also, a criterion for sheet ice formation is presented where the limiting water velocity is a function of heat losses. Finally, the variation of calculated water temperature with distance shows a point of maximum supercooling followed by "residual" supercooling, without the necessity of having to prescribe values to these parameters.
Year: 1984