Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2024, Vol. 21, No. 6, pp. 284-293
Spatiotemporal dynamics of phytoplankton blooms in Kuibyshev Reservoir based on satellite remote sensing data
O.V. Nikitin
1 , N.Yu. Stepanova
2 , T.A. Kondrateva
3, 4 , R.S. Kuzmin
1 , V.Z. Latypova
2 1 Ekoaudit LLC, Kazan, Russia
2 Kazan Federal University, Kazan, Russia
3 Administration for Hydrometeorology and Environmental Monitoring of Tatarstan Republic, Kazan, Russia
4 Hydrometeorology and Environmental Monitoring Federal State Budgetary Institution, Kazan, Russia
Accepted: 21.10.2024
DOI: 10.21046/2070-7401-2024-21-6-284-293
In this study, we evaluate the spatiotemporal dynamics of phytoplankton bloom processes in the surface waters of the Kuibyshev Reservoir (Russia) using Sentinel-2 satellite data, which includes 1228 images over the period from 2019 to 2023. The analysis was conducted with a sub-decade temporal resolution, covering the vegetative period from May to October corresponding to the active growth phase of phytoplankton. For the water area of eight reaches and the Cheremshansky Bay, which together represent about 86 % of the reservoir, annual monthly and seasonal mean values for the Normalized Difference Chlorophyll Index (NDCI), chlorophyll a (Chl a) concentration, and the area affected by the bloom were calculated. The bloom was observed annually, with its peak intensity in July – August (NDCI = 0.107…0.108) corresponding to Chl a concentrations of approximately 26–27 mg/m3, indicating the eutrophic status of the reservoir. During this period, intense bloom covered an average of 41–44 % of the water surface. Spatially, the highest NDCI values were recorded in the southern parts of the reservoir, particularly in Cheremshansky Bay (NDCI=0.369) and Priplotinny reach (NDCI = 0.367). Correlation analysis revealed strong similarities between adjacent sections of the reservoir, and hierarchical cluster analysis allowed for the identification of three groups based on bloom intensity: 1) Priplotinny, Novodevichensky, Ulyanovsky reaches, and Cheremshansky Bay; 2) Undorsky, Tetyushinsky, Volzhsky reaches; 3) Volzhsko-Kamsky and Kamsky reaches. Bloom dynamics in the Undorsky and Tetyushinsky reaches matched the general dynamics of the reservoir most closely (pairwise correlation coefficient r = 0.964 and r = 0.962, respectively), whereas the Kamsky reach showed the weakest correlation (r = 0.809).
Keywords: phytoplankton, algae bloom, Kuibyshev Reservoir, Earth remote sensing, Normalized Difference Chlorophyll Index, NDCI, Sentinel-2, Google Earth Engine
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