DBPapers
DOI: 10.5593/SGEM2015/B11/S1.056

RESULTS OF PRELIMINARY PHASE OF STUDY OF BOTTOM SEDIMENTS COMPOSITION IN SOUTHERN PART OF BRATSK RESERVOIR: SOME PHYSICAL AND CHEMICAL CHARACTERISTICS

V. A. Babicheva, M.A. Rzetala
Tuesday 4 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-31-5 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 1, 443-450 pp

ABSTRACT
The aim of this research was to study the particle size distribution and to obtain data on the change of the aforementioned components in the composition of bottom sediments in the southern part of the Bratsk Reservoir, which will be the basis for further study of the consistent patterns of accumulation and distribution of trace elements and heavy metals in bottom sediments.
Laboratory analyses of 18 samples of bottom sediments from the southern part of the Bratsk Reservoir have been performed. The samples were taken from the surface layer of sediments, 10 cm thick, depth of selection ranged from 2.5 to 28 m. The samples were analysed in the Analytical Centre of the Institute of the Earth Crust, Irkutsk, Russia.
Studies of the particle size distribution of bottom sediments in the southern part of the Bratsk Reservoir have revealed the predominance of fine-grained silt (aleurite) and aleuritic-clayed silt with a high degree of aggregation of finely divided particles.
According to the results of the chemical analysis of aqueous extract, silts from the Bratsk Reservoir are characterized by varying degrees of salinity: from moderately saline (Water-soluble salt contents, Sws % range from 0.329 to 0.944 %) to very strongly saline ones (Sws up to 2.080 %); the average value is 1.042 %. There is a so-called “saline contamination” of bottom sediments; total carbonate content in the bottom sediments varies from 15.08 to 31.32 %, an average of 24.36 %; CaCO3 and MgCO3 prevail in the composition of carbonate salts.
The content of mobile (free) fractions of aluminium oxide (Al2O3) is 0.48-6.13% (an average of 1.43 %). This component, which serves as cement and is involved in the formation of structural bonds of sediment, enhances the aggregation of particles.
The content of organic carbon ranges from 1.14 to 17.70 %, and its average value is 5.60 %. The fact that the bulk of the organic carbon in the bottom sediments of the Bratsk Reservoir is accounted for humic acids indicates a high degree of humified bottom sediments in the Reservoir, which in turn, suggests the allochthonous nature of humic matter in the Reservoir sediments.

Keywords: silts, grain (particle) size distribution, physical and chemical activity of bottom sediments, structure-forming (textural) components.

PAPER 10.5593/SGEM2015/B11/S1.056 : RESULTS OF PRELIMINARY PHASE OF STUDY OF BOTTOM SEDIMENTS COMPOSITION IN SOUTHERN PART OF BRATSK RESERVOIR: SOME PHYSICAL AND CHEMICAL CHARACTERISTICS

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