Shallow zones and their role in the ecosystem of the Sheksna Reach of the Rybinsk Reservoir

[摘要] Based on the materials of monitoring of bottom sediments and a special voyage of the RV Akademik Topchiev in 2016-2018 in the Sheksna Reach of the Rybinsk Reservoir which is a recipient of semi-purified waste waters from chemical and metallurgical enterprises of the city of Cherepovets, the role of the littoral zone in dilution of pollutants in water and their accumulation in bottom sediments in the profundal zone of the flooded channel of the Sheksna River to the settlement of Gayutino has been estimated. The results indicate that runoff and wind-induced currents promote intensive horizontal transfer and dilution of sewages in a shallow zone, and hydrodynamic conditions in a deep-water zone promote vertical sedimentation and irretrievable deposition of pollutants in bottom sediments at depths of more than 6 m. Chemical and biological processes leading to self-purification of industrial and domestic wastewaters and contributing to the maintenance of optimal water quality take place along with the physical processes.

[学科分类] 自然科学（综合）