Annual Variability of the Wave Regime in the Deep Zone of the Black Sea

N. N. Voronina, A. S. Zapevalov*

Marine Hydrophysical Institute of RAS, Sevastopol, Russia

* e-mail: sevzepter@mail.ru

Abstract

The analysis results of intra-annual variability of the Black Sea wind waves are presented. For analysis, a product obtained using the numerical spectral model MFWAM is used. The MFWAM model assimilates the data of altimeters installed on Jason-2 and Jason-3, Saral and CryoSat-2 satellites, with a time step of 6 hours. The spatial variability of two main characteristics of the wave field is analyzed: the significant wave height and average period of dominant waves. It is shown that for the deepwater part of the Black Sea there is a well-pronounced tendency of spatial changes in the intensity of waves: when moving eastward, the average values of the significant wave height decrease. This trend is observed in all seasons. The average values of a significant height in the western part for the three-year period from June 1, 2016 to May 31, 2019 are 0.94–0.96 m, those in the eastern part are 0.62–0.78 m. The ratio of the average values of the significant wave height in winter and summer in the eastern part is 2.3, while that in the western part is 1.7. A seasonal variation is also observed for changes in the periods of dominant waves. Larger periods are observed in winter, while smaller ones – in summer. The differences in the mean periods between the western and eastern regions of the Black Sea are mild. In autumn season, they reach 0.4 s, in other seasons – 0.2 s.

Keywords

wave height, MFWAM model, annual variability, Black Sea.

Acknowledgments

The research is performed under state order on topic no. 0827-2018-0003 “Fundamental studies of oceanological processes that determine the state and evolution of the marine environment under the influence of natural and anthropogenic factors, based on methods of observation and modeling”.

For citation

Voronina, N.N. and Zapevalov, A.S., 2020. Annual Variability of the Wave Regime in the Deep Zone of the Black Sea. Ecological Safety of Coastal and Shelf Zones of Sea, (1), pp. 60–69. doi:10.22449/2413-5577-2020-1-60-69 (in Russian).

DOI

10.22449/2413-5577-2020-1-60-68

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