BEHAVIOR OF HEAVY-METALS IN THE PROCESSES OF RIVER AND SEAWATER MIXING - ESTIMATES OF THE INFLUENCE OF HYDRODYNAMIC PROCESSES ON THE SPATIAL-DISTRIBUTION OF FE, MN, ZN AND CU IN ESTUARY OF RAZDOLNAYA RIVER (AMUR BAY)

The influence of hydrodynamic factors (advection, diffusion) on the sp atial distribution of Fe, Mn, Zn and Cu at the Amur Bay (Japan Sea) ne ar the Razdolnaya River mouth were studied. The numerical modeling and the balance analysis of the chemical fields was applied. The transiti ons in chemical migration forms, of heavy metals are favored by the wa ter circulation. Centres of accumulation and removal of toxic metals a re formed as a result of hydrodynamic factors. These centres represent the active zones of transition of chemical migration forms of Fe, Mn, Zn and Cu. The heavy toxic metals could be involved in sorption-desor ption processes of biological cycles in transformation zones.