STUDY OF THE EVOLUTION OF A THREE-DIMENSIONAL STRUCTURE OF THE ADMIXTURE FIELD DURING CYCLONE PASSAGE

D. V. Alekseev, V. A. Ivanov, E. V. Ivancha, V. V. Fomin, and L. V. Cherkesov

A numerical sigma coordinate system is used to study the transformation of local pollution on the Black Sea northwestern shelf during the passage of a front. The model is based on the nonlinear hydrodynamic equations for homogeneous viscous incompressible fluid under hydrostatics assumption and on the turbulent diffusion equation. An atmospheric disturbance is a moving axisymmetric low-pressure area with the corresponding wind field. Pollution emissions are generated by instantaneous sources placed on the free sea surface. Dependences of the forms of trajectories of pollution areas, the time needed for their dissipation, and the admixture penetration depth on the intensity of diffusion processes and local bottom morphometry are determined.