ABSTRACT:

The work contains the results of research on modeling the influence of solid ice on the concentrations formation of the impurity substances into the frozen sea waters. In a simulation model the block is developed, allowing to include in calculation procedure the change of ice area depending on the period of a cold season. Monte-Carlo method is applied to simulation of turbulent diffusion. For calculation of wind currents the equations of shallow water by are used. Wind currents are calculated under scenarios of directions and speeds of a wind, inherent in the given region. Residual currents are set by means of the stream functions, which has been shaped on the basis of experimental data. The analysis of calculation results has shown that the ice cover considerably changes total speeds in water areas and a picture of polluting substances distribution

INTRODUCTION

There are sea areas receiving considerable anthropogenous loadings in many shelf zones. Field data of an ecological conditions of some sea areas have shown that there are cases of sharp pollutants concentration increase in a cold season in them. Especially substantial growth of concentration is observed in the sea areas with ice cover, if discharge of sewage is made under ice. The reasons of such deterioration of water quality are the speed decrease of biochemical oxygen demand for organic components and of water exchange intensity. Synthesis of a modeling task and the program of calculation for definition of pollutants concentration, arriving on sea area, which are in full or in part covered by ice was a problem of our researches. On sea areas covered with ice residual currents, ebb-tide fluctuations, the currents connected with a drain of the rivers and pileup currents bear responsibility for advection of pollutants only.

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