Author(s): Huanwen Ha; Shunan Lu; Han Jiang
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Keywords: No Keywords
Abstract: In literature the thickness of the ice cover after its formation is usually evaluated through use of the thermal energy conservation equation, that is, the algebraic sum of the surface heat exchange of the ice cover with the air and the heat conducted from the water body beneath the ice cover to its bottom surface is equal to the latent heat of fusion of ice for the volume. However, this method requires many meteorological parameters that are not always available and some of which, for example as clouds in the sky, are difficult to determine with accuracy. In the meantime, in literature (Ha Huanwen, 1992.) a series of characteristics with respect to increase and reduction in thickness of the ice cover are attained under the air temperatures varying monotonously. However, the air temperature virtually always varies in magnitude as well as in its sign, e. g. there exist air temperature waves. For proceeding mentioned two reasons in this paper a new model for determining the ice cover thickness has been developed. The presented computational model is able to considerate act of air temperature waves on a change in ice thickness and only need original data of the air and water body temperatures which may more easily and accurately be found. The computational results of the ice cover thickness gained by using the presented method are verified by prototype observation data and are satisfactorily compatible with those calculated by means of the conservation equation for thermal energy.
Year: 1994