NUMERICAL STUDY OF THE PROCESS OF THE RIVER DON SUSPENDED SOLIDS RUNOFF DISTRIBUTION IN THE TAGANROG BAY USING A MATHEMATICAL MODEL
The basic equations describing the mathematical model of the process of transfer and sedimentation of solid runoff from the Don to the Taganrog Bay are given. Hydrodynamics is described by a two-layer model of wind currents, the transport component is described by the convection-diffusion equation. The process of sediment accumulation of suspended sediments on the mouth of the Don has been considered under different wind situations. It is shown that under the action of the east wind of 6-8 m/s during the entire settlement period (6-7 calendar days) the water movement in the Taganrog Bay is progressive, and under the action of the south-west wind of the same speed, the pattern of current lines changes in time from the progressive movements on the first day to the formation of two circulation zones in the area of the city of Taganrog and in the central part of the Don mouth seaside. It is shown that the fields of suspended matter concentration are similar for different fractions of solids. Under the action of the east wind, they stretched along the extension of the axis of the main branches of the delta at the bay, under the action of the south-west - pressed to the mouths of branches. During the eastern wind surges, the heavy fractions of sediment settle in the area of the Azov-Don navigable canal, and the light ones are carried by the stream towards the bay. During the western wind surges, the sedimentation of the suspended solids occurs near the wellhead, the heavy fractions form three areas of deformation of the bottom near the mouths of the main branches of the delta, the light ones - only two areas.