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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. 3, pp. 230-243

Horizontal water circulation and morphometric parameters of Lake Sevan in the modern period (satellite information)

A.I. Ginzburg 1 , A.G. Kostianoy 1, 2 , N.A. Sheremet 1 , A.V. Kouraev 3 
1 Shirshov Institute of Oceanology RAS, Moscow, Russia
2 Moscow Witte University, Moscow, Russia
3 LEGOS, Université de Toulouse, Toulouse, France
Accepted: 19.05.2023
DOI: 10.21046/2070-7401-2023-20-3-230-243
The need to control the ecological state of the modern eutrophicated (as a result of a planned artificial level decrease) Lake Sevan determines the relevance of studying the processes of horizontal water exchange in this closed reservoir. In this paper, the study of the horizontal circulation of the lake was carried out based on the analysis of optical images of Sentinel-2A MSI with a high spatiotemporal resolution (20 m, 5–10 days) related to the summer–autumn period of 2020–2022. Intensive eddy dynamics was demonstrated throughout the Major Sevan basin with eddy sizes from about 3 to 20 km, which noticeably changes on time scales of 5 days. In this case, a quasi-stationary circulation element is a cyclonic eddy with a changing position of the center (within about 4 km in the meridional and 7 km in the zonal directions) and size (from 9–10 to 20 km), which forms eddy dipoles and tripoles with elements of anticyclonic vorticity. Similar eddy structures with a quasi-stationary cyclone are also characteristic of Minor Sevan. A comparison was made of the morphometric parameters of Lake Sevan (level, surface area, volume increments relative to the reference value for 07.07.1995), contained in the online database HydroWeb LEGOS, France, and based on satellite altimetry measurements of the level, with the corresponding published values according to the data of gauging stations in Armenia. It is shown that, with a qualitative correspondence between the nature of changes in the lake level according to altimetry and instrumental measurements, the values in the HydroWeb database exceed in most cases the data of gauging stations by 1–1.5 m in 1995–2012 and 0.5–0.6 m in 2013–2022, while the corresponding volume values according to HydroWeb data turn out to be underestimated.
Keywords: Lake Sevan, morphometric parameters of Lake Sevan, water circulation of Lake Sevan, water bloom, eddies, eddy dipoles, satellite data, optical images
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