DBPapers
DOI: 10.5593/SGEM2016/B32/S15.104

OXYGEN DEPLETION RISK ASSESSMENT IN SHALLOW WATER BODIES OF THE SEA OF AZOV REGION

V. Kulygin, S. Berdnikov, V. Selyutin, L. Dashkevich
Thursday 8 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-62-9 / ISSN 1314-2704, June 28 - July 6, 2016, Book3 Vol. 2, 799-806 pp

ABSTRACT
"Blooming" of water as a result of mass reproduction of algae is extremely actual and typical phenomenon of the Sea of Azov region. It is observed in the Sea of Azov, delta of the Don River, Tsimlyansk reservoir and other water bodies of the region. The excess amount of organic matter can cause a dramatic deterioration of the water oxygen regime along with so-called hypoxia phenomena, which may be accompanied by a massive death of aquatic organisms, especially fish and benthic. 1D mathematical model of oxygen regime, describing the seasonal variation of the oxygen concentration, its vertical distribution and interaction with sediments, is presented. The risk of oxygen depletion is calculated as the frequency (probability) of situations reducing the concentration of oxygen at a certain depth below a specified critical threshold. The oxygen depletion risk assessment in the conditions of Tsimlyansk reservoir with the using of the proposed approach is presented. The model parameters were calibrated by in-situ measurements in August 2011. Estimated frequency curve (decumulative distribution function) of dissolved oxygen in the Tsimlyansk reservoir in areas with different depths are presented.

Keywords: oxygen depletion, mathematical modeling, the Sea of Azov, Tsimlyansk Reservoir