10.24411/1816-1863-2018-13075

Environmental Safety Construction and Town Economy

DIFFUSE REMOVAL OF NUTRIENTS FROM THE TERRITORY OF NIZHNY NOVGOROD

S. V. Dolgov, Ph. D. (Geography), Senior Researcher, This email address is being protected from spambots. You need JavaScript enabled to view it., Institute of Geography, Russian Academy of Sciences, Moscow, Russia

Methodical approaches to the integral assessment of diffuse removal of nutrients from urban areas in the absence of direct hydrological observations have been developed and tested on the example of the territory of Nizhni Novgorod. The conditionally-natural runoff of the Rakhma River, the catchment area of which is occupied mainly by the modern urban development of Nizhny Novgorod, has been reproduced by the runoff of the Sundovik river according to the Roshydromet data, in recent years (2010—2017). The analysis of the intra-annual distribution of the Rakhma River flow has been performed, taking into account the combined effect of climatic and anthropogenic factors, the changes in the underground and surface components thereof have been estimated. It is shown that the surface component of the runoff of the Rakhma River increased by 2 times, but the underground component decreased by 38 %. The amount of underground flow remains high enough — 63 mm per year, which is 33 % of the total river flow. The results of calculations of the removal of biogens in the Cheboksary reservoir with river runoff in different seasons of the year are shown, minus the receipt of sewage. An indicative estimate is given for the modern diffuse removal of nutrients from the territory of Nizhny Novgorod. The highest removal of mineral nitrogen, reaching 195 kg/km2, is observed during the cold period of the year, and phosphorus for the period of passage of the spring high water — 11 kg/km2.

Cheboksary reservoir, removal of biogens from urban areas, surface and underground components of runoff, climatic and anthropogenic changes.

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