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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2023, Vol. 20, No. 1, pp. 242-252

A study of the effect of hydropower operation regime on the redistribution of phytoplankton in the upper water layer in the dam section of the Gorki Reservoir

D.V. Dobrokhotova 1, 2 , I.A. Kapustin 1, 2 , A.A. Molkov 1, 2 , G.V. Leshchev 1, 2 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
2 Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
Accepted: 09.02.2023
DOI: 10.21046/2070-7401-2023-20-1-242-252
During the period from July to September, cascade active “blooming” of waters is observed in water reservoirs of Volga, with phytoplankton being distributed non-uniformly in the water area. In the present work, based on a series of concurrent satellite and field measurements in the southern part of the Gorki Reservoir, a qualitative assessment of the contribution of some geophysical factors to algal redistribution was first carried out. The geophysical factors considered include the operating regime of the hydropower plant and the irregular flows occurring under conditions of variable water discharge. The experiments were carried out on 1, 2 and 10 August 2018 and included measurements of flow fields, wind and chlorophyll a concentrations. Based on experimental data, optical satellite images from Sentinel-2/MSI, Sentinel-3/OLCI and Landsat-8/OLI (August 1–5, 10) and hourly water discharge data from the hydropower plant, a preliminary description of the effect of phytoplankton redistribution was proposed, taking into account the currents in the Reservoir. During the peak daily discharge, phytoplankton is carried out from the rivers flowing into the Reservoir and concentrated in the old riverbed of Volga. In low wind conditions, further phytoplankton distribution and local redistribution are influenced by irregular currents occurring under conditions of variable discharge through the hydropower plant, namely regulated channel flow, reverse currents and gyres. Preliminary results show that during a typical period of the first ten-day period in August the distribution of phytoplankton has a high space-time variability.
Keywords: phytoplankton, heterogeneous currents, river discharge, fluid flow through the hydroelectric power station, optical satellite images, Gorki Reservoir
Full text

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