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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, 2021, Vol. 18, No. 1, pp. 188-196

Field observations of convergent currents in the near-surface layer of water using foam patterns in quasi-synchronous satellite optical images

I.A. Kapustin 1, 2 , D.V. Vostryakova 1, 3 , A.A. Molkov 1, 4 , O.A. Danilicheva 1 , G.V. Leshchev 1 , S.A. Ermakov 1, 4 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
2 Volga State University of Water Transport, Nizhny Novgorod, Russia
3 Lobachevsky State University of Nizhni Novgorod, Nizhny Novgorod, Russia
4 Volga State University of Water Transport,, Nizhny Novgorod, Russia
Accepted: 07.12.2020
DOI: 10.21046/2070-7401-2021-18-1-188-196
Foam bands are observed on the water surface under the conditions of moderate and strong winds. There are several causes for the appearance of foam structures on the surface of the reservoir. For example, foam can be produced during the process of wave breaking or due to the emersion of dissolved bubbles with surfactants adsorbed on their surface. The shape of foam structure is affected by subsurface current which leads to the transfer and compression of surfactants on the water surface. Foam structures are also characterized by color contrast and can be observed in optical images. The paper presents the results of the investigation of foam band structure on the water surface. Quasi-synchronous measurements of current and wind fields and optical satellite imaging by Sentinel-2A are performed during experiments in the Gorky reservoir. The convergence zone, which is associated with a temperature gradient and an uneven water flow through the hydroelectric power plant, is observed near the location of the foam band. Possible mechanisms of the foam bands formation are considered and their physical explanation are proposed.
Keywords: foam on the sea surface, surfactant films, slicks, ADCP measurements, satellite images, convergence of currents
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