The paper presents experimental results and results of theoretical studies of evolution of stratified currents system, which includes upwelling-induced currents, seiche-induced wave currents and density currents in Volkhov bay, Lake Ladoga. It was discovered that in the near bottom layer coastal upwelling prevails. It was found that upwelling provides bay's water purification in a moderate breeze. Blocking of submerged jet of river water by upwelling was discovered. It was shown that during this process jet rise and jet thickening took place, given that the speed increased and the height of bottom current also increased. The version of mathematical model of discovered currents system was suggested, being represented as a determined system, using semi-empirical expression for upwelling height, trajectory and thickness of a jet.
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