ASSESSMENT OF ACCUMULATED ENVIRONMENTAL DAMAGE IMPACT ON SMALL RIVER GEOSYSTEMS 

V. M. Pitul’ko^1,*, V. V. Kulibaba^1,**, and V. V. Ivanova^2,***

¹ St.Petersburg Research Centre for Ecological Safety RAS, Korpusnaya ul., 18, St. Petersburg, 197110 Russia
² Gramberg All-Russia Research Institute for Geology and Mineral Resources of the Ocean, Angliiskii pr., 1, St. Petersburg, 190121 Russia *E-mail: pitulko@rambler.ru
**E-mail: kouval@rambler.ru
***E-mail: vargeo66@gmail.com 

Environmental damage to geosystems is the main factor, the consideration of which ensures the rational nature management. The relevance of this work is associated with the development of a methodology for environmental impact assessment of territories in conditions of high density of objects of accumulated environmental damage (OAED). The influence of OAED on the hydrochemical regime of small rivers catchments in the Gulf of Finland basin was studied within the catchment of the Mga River, which is characterized by a high density and a wide range of OAEDs. The geoecological surveys of recipient water streams were carried out including the study of the water and bottom sediments quality in the Mga and Nazia rivers, large-scale mapping of 27 OAEDs of different types, observations of the quality and usage of the valley-floodplain sections, negative riverbed processes and previous land usage. Two ecogeochemical types of local OAED are relatively evenly distributed: low-volume mixed waste dumps and developed non-regulated peat bogs of various types of peat extraction. The geochemical spectrum of landfill soils is (Pb6.7, As2.2, Cd2.2, Zn1.75, Cr4, Co1.7). It is proposed to consider the impact of OAED on the quality of water resources with the peculiarities of the formation of hydrological and hydrochemical regimes of small rivers, the history of local anthropogenic activity and the dynamics of hydroclimatic indicators. The key parameters are the type of OAED, the area and depth, location within the catchment, and the life cycle of OAED. It is shown that the optimal solution for monitoring the water bodies quality is the integral marker indicators, i.e., the groups of individual substances with similar properties, that allow us to assess the overall level of pollution: COD, BOD20/7/5, suspended particles, dry residues, mineralization.

Key words: accumulated environmental damage, natural economic systems, small rivers, territory renovation, municipalities 

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