File:Явище «цвітіння води» на прикладі Кременчуцького водосховища.jpg

English: The satellite image of the phenomenon of "algae bloom" at the Kremenchug reservoir, was received on September 2, 2016 by the Sentinel-2 satellite provided by the European Space Agency within the Copernicus project. The сomposite is created in "artificial colors" where the following channels of the satellite image from different parts of the electromagnetic spectrum are matched to the image colors: 1 - SWIR Band (1610 nm), 2 - NIR Band (842 nm), 3 - Red Band (665 nm). "Algae bloom" of water is the mass growth of microscopic algae, accompanied by significant deterioration of water quality. This is caused by the set of factors, such as climate change, a large number of different mineral and organic substances falling into water and is associated with the intensification of human economic activity. Intensive "algae bloom" is characteristic, above all, for reservoirs with weak currents in particular such as the cascade of the Dnipro reservoirs. The space image shows that the intensive bloom areas are stretched along currents and are involved in vortex movements, in addition to the transfer of algae, the most significant influence is the wind. In periods with prolonged warm, sunny and windless weather, cyanobacteria are combined into aggregates that forming surface or subsurface clusters. On satellite images, the cyanobacteria appear in the form of bright filamentous stripes or even clusters. And the color of these spots depends on the stage of development of algae: from bright green to brownish brown own.

English: The phenomenon of "algae bloom" on the example of the Kremenchug reservoir