Formation of the fast ice from the seasonal ice and its destruction |
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| Authors: | L R Lukin |
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| Institution: | 1. Institute of Ecological Problems of the North, Ural Branch, Russian Academy of Sciences, nab. Severnoi Dviny 23, Arkhangelsk, 163000, Russia
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| Abstract: | Considered is the theoretical mechanism of the formation of immovable ice cover along the coast (the fast ice) from the seasonal ice and the mechanism of its destruction. It is demonstrated that the process of formation and spread of the winter stable fast ice is determined by simultaneous impact of several factors: the morphometry of the coast and bottom, the width of the close ice, dynamic effects that shear stress forces of the flow and wind make on the ice, the duration of maintaining the condition of immobility and freezing (adhesion) of the ice, the thickness of adhered ice, and the intensity of thermal growth of ice from below. It is revealed that the permanent factor is the morphometry of coasts and the bottom while the other factors have temporal variability of various scales. |
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