Geochemical Features of River Runoff and Their Effect on the State of the Aquatic Environment of Lake Onego
Author:
Kulik Natalia1ORCID, Efremenko Natalia1, Strakhovenko Vera2, Belkina Natalia1ORCID, Borodulina Galina1ORCID, Gatalskaya Ekaterina1, Malov Viktor2ORCID, Tokarev Igor3ORCID
Affiliation:
1. Northern Water Problems Institute of the Karelian Research Centre of the Russian Academy of Sciences, 185030 Petrozavodsk, Russia 2. Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences, 630090 Novosibirsk, Russia 3. Centre for Geo-Environmental Research and Modelling (GEOMODEL), Research Park, Saint-Petersburg State University, 198504 St. Petersburg, Russia
Abstract
This paper presents the results of seasonal observations of the geochemical composition of the waters of the large tributaries of Lake Onego. The mineralogy and geochemistry of the suspended matter and the isotopic composition (oxygen-18 and deuterium) of the river waters were studied for the first time. The dependence of the chemical and isotopic compositions of the tributary water on the season and characteristics of the catchment area (swampiness and lacustrine) was revealed. It is shown that the river waters belong to the bicarbonate class of the calcium group and have low mineralization, high color and a similar composition to the main minerals of the suspended matter. It is determined that the difference between the multielement spectra of the water and suspended matter of the different rivers is closely related to the geological and geomorphological structures of river basins. It is established that the quantitative characteristics of the mineral and organic parts of the suspended matter, the ratios of the different minerals andthe size and patterning of the particles of detrital material in the tributaries differ. The change in the mineralogical and geochemical compositions of the suspended matter of each individual river over the year is insignificant. The influence of the river runoff on the formation of lake waters is manifested in the chemical composition of the lake waters. The quantitative ratios of the main ions, biogenic elements and microcomponents in lake water mainly correspond to their ratios in river waters. The mineral part of the dispersed sedimentary matter of the lake in its geochemical characteristics is close to the suspended matter of the river waters.
Funder
RSF project RFBR Northern Water Problems Institute
Subject
Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry
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