Open AccessThe Rybinsk Reservoir Water Quality: the Dissolved Oxygen Regime.
Author(s) -
I. E. Stepanova
Publication year - 2016
Publication title -
vodnoe hozâjstvo rossii: problemy, tehnologii, upravlenie/vodnoe hozâjstvo rossii : problemy, tehnologii, upravlenie
Language(s) - English
Resource type - Journals
eISSN - 2686-8253
pISSN - 1999-4508
DOI - 10.35567/1999-4508-2016-5-2
Subject(s) - water body , stratification (seeds) , oxygen , water quality , saturation (graph theory) , oxygen saturation , environmental science , hydrology (agriculture) , limiting oxygen concentration , surface water , aquatic ecosystem , environmental chemistry , chemistry , geology , ecology , environmental engineering , biology , geotechnical engineering , organic chemistry , seed dormancy , botany , germination , mathematics , combinatorics , dormancy
This study was undertaken to investigate the dissolved oxygen content and saturation percentage in surface and near-bottom water of the Rybinsk Reservoir in 2011-2015 with Winkler method. Seasonal and annual variations of the oxygen concentrations in the water body were identified. It was found that in summer time shallower water in the Main part was seldom subjected to oxygen stratification and if stratification occurred it ass less expressed than in deeper parts of the reservoir. Comparison of the new data on the dissolve oxygen concentration with the previously obtained data was made. Over the past years, there have not been any significant changes in the reservoir oxygen regime. The dissolved oxygen concentration in the reservoir seldom reached full saturation of the studied period. On average, aquatic organisms in the water body have enough dissolved oxygen. However, sometimes its concentration in nearbottom layers drops to critically low levels, threatening aquatic life.