The impact of aeration on ecological state of lake Telbyn in Kyiv


Keywords: aeration, lake, thermocline, nutrients, phytoplankton, remote sensing data

Abstract

Lake Telbyn is considered to be one of the largest lakes located in the eastern part of Kyiv. The artificial aeration of this lake was started at the end of 2016 by using of 8 aerators, which has been continuing so far. The main perpose of this measure is improving the ecological state of the lake mostly for recreational use. There were carried out a field study of the lake and the analysis of remote sensing data. Physical and chemical characteristics of water, phytoplankton biomass, chlo- rophyll a concentration and some other parameters at the different depths were studied. It was found out that artificial aeration has a positive effect on the ecological state of the lake. The water aeration causes the blur of thermocline whereas the impact on its depth is not essential. Under impact of aeration the concentration of dissolved oxygen become larger, mostly in the bottom layer. The highest concentration of ammonium nitrogen in a warm period is observed in the bottom layer of the lake. The deep location of aerators causes the increasing of concentration in bottom layer. At the same time there is not visible impact on concentration near the surface. The similar result was obtained for the concentration of inorganic phosphorus. The impact of aeration on algal bloom is not such essential as on hydrochemical characteristics. The artificial aeration causes negative impact on the phytoplankton abundance and less effect on their biomass. It means the larger effect on the algae with small cells. In other words the aeration has larger impact on green algae than on blue-green ones. The use of remote sensing data showed that ecological state of Lake Telbyn during the aeration period improved comparably with other lakes of Kyiv. As a result of aeration, the view of water surface of the lake became more similar to water surface of the Dnipro River, which flows through the city.

Author Biographies

Viktor I. Vyshnevskyi
National Aviation Univercity, Kyiv
Vladislav A. Zhezherya
Institute of Hydrobiology of NAS of Ukraine, Kyiv
Inna M. Nezbrytska
Institute of Hydrobiology of NAS of Ukraine, Kyiv
Olena P. Bilous
Institute of Hydrobiology of NAS of Ukraine, Kyiv

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Published
2021-04-10
How to Cite
Vyshnevskyi, V., Zhezherya, V., Nezbrytska, I., & Bilous, O. (2021). The impact of aeration on ecological state of lake Telbyn in Kyiv. Journal of Geology, Geography and Geoecology, 30(1), 179-189. https://doi.org/https://doi.org/10.15421/112116