Nutrient dynamics along the Moskva River under heavy pollution and limited self-purification capacity

Abstract

An extensive study conducted during the dry summer of 2019 provided a detailed picture of the nutrient content dynamics along the Moskva River. Water sampling at 38 locations on the main river and at 17 of its tributaries revealed a manifold increase in phosphorus and nitrogen concentrations as the river crosses the Moscow metropolitan area, which can be attributed to both direct discharge of poorly treated sewage and nonpoint urban pollution. Even at the Moskva River lower reaches, where the anthropogenic pressure on the river and its tributaries is less pronounced, the inorganic nitrogen and phosphorus content remains consistently high and exceeds the environmental guidelines by up to almost 10 times. This indicates increased vulnerability of the Moskva River ecosystem during periods of low flow, which can be a major factor of eutrophication in the entire Moskva-Oka-Volga system. Comparison of our data with some archive records shows no significant improve in the nutrient pollution of the river since the 1990s, which raises further concern about the effectiveness of water quality management in Moscow urban region.

Rainstorms impacts on water, sediment, and trace elements loads in an urbanized catchment within Moscow city: case study of summer 2020 and 2021

“…To the best of our knowledge, there is no data regarding impact of extreme precipitation on timing and magnitude of oods, as well as their environmental impacts. In particular, within the largest tributary of Moscow River (Setun river, 190 km 2 which are located entirely within Moscow city), Moscow State University since 2019 operates the network of stage-discharge autonomous stations which also supported by systematic investigations of major and trace element chemistry during a single ood events (Tereshina et al 2020(Tereshina et al , 2021Sokolov et al 2021).…”