DBPapers
DOI: 10.5593/SGEM2014/B31/S12.057

INVESTIGATION OF HYDROLOGICAL PROCESSES IN THE LAKE PART OF LOWLAND RESERVOIRS OF THE VOLGA BASIN

A. Ivanov, I. Afanasyeva, Y. Troitskaya
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-13-1 / ISSN 1314-2704, June 19-25, 2014, Book 3, Vol. 1, 441-446 pp

ABSTRACT
Thermal stable stratification was investigated in the lake part of lowland Gorky reservoir during field studies in June-October 2013. In late May and early June the seasonal heating of water upper layer produced pronounced thermal stratification before bottom mud was not heated enough. By the middle July the thermal stable stratification produced by was destroyed under the influence of strong wind. Under these conditions stable thermocline-type stratification was formed as a result of diurnal heating of the upper layer by 0.2…1.0 ºC. Classification of types of stratification was proposed to identify its role on water quality of plane river reservoirs. Parameters of stability of stratified flow in the reservoir in terms of the Brent frequency and Richardson number were estimated. A significant decrease in species production and diversity was associated with the seasonal decline in temperature. Preliminary conclusion about the effect of stratification is that the bundle leads to increased concentrations of cyanobacteria and their dominance, while stirring enhances diatoms competitiveness.

Keywords: lowland reservoirs, thermal stratification, water quality, algae bloom.