Категория: Publications

21 – 25 сентября 2020 г.

Extreme wind waves in the Black Sea

Boris V. Divinsky a,, Vladimir V. Fomin b, Ruben D. Kosyan a, Yuri D. Ratner b

a Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia

b Marine Hydrophysical Institute, Russian Academy of Sciences, Sevastopol, Russia

Results of the analysis of a long-term data set, including fields of significant waveheights of the surface wave components, and mixed (total) wave field in the Black Sea arepresented. The data set was collected on the basis of retrospective calculations using the MIKE21 SW spectral wave model with the atmospheric forcing based on the ERA-Interim data in theperiod from 1979 to 2017. A criterion is used to isolate the swell waves from the initial wave dataset that takes intoaccount the wave age. We used the experimental data to develop a regressionrelationshipshowing that the maximum possible wave height can exceed the significant waveheightapproximately one and a half times. Analysis of the spatial distribution of wave heights intheBlack Sea suggests that a possibility exists that significant wave height of storm waves can beas high as 12 m. This result indicates that the actual heights of maximum waves in the Black Seacan reach 18—19 m. Three regions are distinguished on the basis of the wave potential. Thetimesof manifestation of extreme situations in these regions are different: in the southwestern part ofthe sea, extreme storm situations occur, as a rule, in December—January; in the region south ofthe Crimea Peninsula this happens in February; in the northeastern part of the sea they occur inNovember. It was also found that the south-southeastern and eastern parts of the sea are mostaffected by swell.


Maximum waves in the Black Sea

Divinskii B1., Fomin V2., Kosyan R1,3., Lazorenko D2.

1Shirshov Institute  of Oceanology RAS, Moscow, Russia

2Marine Hydrophysical Institute RAS, Sevastopol, Russia

In this paper, a comparison of the wind waves parameters calculations in the Black and Azov seas, using two common spectral wave models: DHI MIKE 21 SW and SWANwas made. The fields of the wind waves main parameters (wave heights, periods, directions of propagation) were obtained for a climatic period of time from 1979 to 2018. Comparison of the calculation results shows that with the accepted model settings, the SWAN model, compared with MIKE, overestimates the values of wave heights with weak and moderate waves and underestimates with the extreme ones. Estimation of the maximum wave heights on the Black Sea, possible once in a given number of years, performed on two different models, was made. It showed that for the conditions of the Black Sea the difference between the calculated values of significant wave heights of rare frequency for the MIKE and SWAN models does not exceed 12%. The maximum significant wave heights, possible once in a hundred years, in the Black Sea can reach 11-12 m.

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