Seasonal Variations of the Significant Altitude of the Waves in the Black Sea

2021 ◽  
pp. 73-80
Author(s):  
N. N. Voronina
Keyword(s):  
Black Sea ◽  
Seasonal Variations ◽  
The Black Sea ◽  
The Waves

scholarly journals ASSESSMENT OF THE ENERGY POTENTIAL OF THE WAVES IN THE BLACK SEA

2018 ◽  
Vol 8 (3) ◽  
pp. 5-10
Author(s):  
Carmen Gasparotti ◽  
◽  
Eugen Rusu ◽  
◽  
◽  
...  
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Energy Potential ◽  
The Waves

scholarly journals Skewness and Kurtosis of the Surface Wave in the Coastal Zone of the Black Sea

2021 ◽  
Vol 37 (4) ◽  
Author(s):  
A. S. Zapevalov ◽  
A. V. Garmashov ◽  
◽  
Keyword(s):  
Black Sea ◽  
Wind Waves ◽  
Correlation Coefficients ◽  
Sea Surface ◽  
Statistical Moments ◽  
Surface Elevation ◽  
The Black Sea ◽  
Sea Waves ◽  
Wide Range ◽  
The Waves

Purpose. The aim of the study is to analyze variability of the statistical moments characterizing deviations of the sea surface elevation distributions from the Gaussian one. Methods and Results. Field studies of the sea waves’ characteristics were carried out from the stationary oceanographic platform located in the Black Sea near the Southern coast of Crimea. The data obtained both in summer and winter, were used. The statistical moments were calculated separately for wind waves and swell. The measurements were performed in a wide range of meteorological conditions and wave parameters (wind speed varied from 0 to 26 m/s, wave age – from 0 to 5.2 and steepness – from 0.005 to 0.095). For wind waves, the coefficients of skewness correlation with the waves’ steepness and age were equal to 0.46 and 0.38. The kurtosis correlation coefficients with these parameters were small (0.09 and 0.07), but with the confidence level 99.8% – significant. For swell, the correlation coefficients were 1.5 – 2.0 times lower. Conclusions. The statistical moments of the sea surface elevations of the third and higher orders are the indicators of the wave field nonlinearity, which should be taken into account when solving a wide range of the applied and fundamental problems. The deviations of the surface elevation distributions from the Gaussian one are not described unambiguously by the waves’ steepness and age. At the fixed values of these parameters, a large scatter in the values of the surface elevations’ asymmetry and kurtosis is observed. This imposes significant limitations on the possibility of applying the nonlinear wave models based on the wave profile expansion by small parameter (steepness) degrees, in engineering calculations.

scholarly journals Wave Regime and Lithodynamics in the Region of the Western Crimea Accumulative Coasts

2020 ◽  
Vol 27 (4) ◽  
Author(s):  
Yu. N. Goryachkin ◽  
V. V. Fomin ◽  
◽  
Keyword(s):  
Black Sea ◽  
Opposite Direction ◽  
Wind Waves ◽  
Reanalysis Data ◽  
The Black Sea ◽  
Wave Regime ◽  
Wave Characteristics ◽  
Convergence Zones ◽  
The Waves

Purpose. The paper is aimed at obtaining the wave regime characteristics in the region of the Western Crimea accumulative coast, at constructing the scheme of the sediment along-coastal fluxes for various wind directions, at analyzing the previous notions on the lithodynamical processes in the region under study and their comparison with the obtained results. Methods and Results. The wave regime was analyzed using the results of the retrospective calculations of wind waves in the Black Sea derived due to the model SWAN and based on the ERA-Interim atmospheric reanalysis data for 1979–2018. The data of retrospective calculations performed by the method of annual maximums yielded the parameters of the waves of various repeatability. The sediment along-coastal flux was simulated and the schemes for six wind directions were constructed by the method including model values of the wave characteristics. Conclusions. Operative and extreme characteristics of the wind waves in the region under study are obtained. It is shown that in the above-mentioned area, the most intense sediment along-coastal fluxes occur being affected by the waves formed by the western, southwestern and southern winds. The northwestern and western winds give rise to the sediment main flux directed to the east. At the western wind, to the southeast from the Donuzlav sandbar and in the coast concavities, the sediments are transported in the opposite direction. When the winds are southwestern and southern, the sediment along-coastal flux move from the Cape Uret to Lake Donuzlav northern spit, where it meets the oppositely directed flux. To the southeast from Lake Donuzlav, the multidirectional fluxes arise; at that, in the coast concavities their convergence zones are formed. At the southeastern and eastern winds, the sediment along-coastal fluxes’ capacity decreases sharply; the fluxes are of multidirectional character and they form not a single flux on any of the long stretches of the coastline.

scholarly journals Long-Term Analysis of the Black Sea Weather Windows

2019 ◽  
Vol 7 (9) ◽  
pp. 303 ◽  
Author(s):  
Onea ◽  
Rusu
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Time Interval ◽  
Significant Wave ◽  
Energy Projects ◽  
Wave Heights ◽  
Maritime Operations ◽  
Significant Wave Heights ◽  
The Waves

A particular aspect of the maritime operations involves available weather intervals, especially in the context of the emerging renewable energy projects. The Black Sea basin is considered for assessment in this work, by analyzing a total of 30-years (1987–2016) of high-resolution wind and wave data. Furthermore, using as reference, the operations thresholds of some installation vessels, some relevant case studies have been identified. The evaluation was made over the entire sea basin, but also for some specific sites located close to the major harbors. In general, the significant wave heights with values above 2.5 m present a maximum restriction of 6%, while for the western sector, a percentage value of 40% is associated to a significant wave height of 1 m. There are situations in which the persistence of a restriction reaches a maximum time interval of 96-h; this being the case of the sites Constanta, Sulina, Istanbul or Burgas. From a long-term perspective, it seems that there is a tendency of the waves to increase close to the Romanian, Bulgarian, and Turkish coastal environments—while an opposite trend is expected for the sites located on the eastern side.

scholarly journals Seasonal Variations in the Dynamics of the Number and Biomass of the Black Sea Macrozooplankton Populations

2021 ◽  
Vol 7 (12) ◽  
pp. 41-46
Author(s):  
N. Louppova
Keyword(s):  
Life Expectancy ◽  
Black Sea ◽  
Seasonal Variations ◽  
The Black Sea ◽  
Mnemiopsis Leidyi ◽  
Average Life ◽  
Average Life Expectancy ◽  
Beroe Ovata ◽  
Northeastern Shelf ◽  
Biomass Dynamics

The abundance and biomass dynamics of the jellyfish Aurelia aurita and ctenophores-invadors Mnemiopsis leidyi and Beroe ovata in 2019 on the northeastern shelf of the Black Sea were studied. Data on the maxima of reproduction of each species of gelatinous macrozooplankton were obtained, as well as conclusions on the dynamics of individuals growth in populations and average life expectancy were drawn.

scholarly journals MEW DESIGNS FOR BEACH PROTECTION STRUCTURES

1972 ◽  
Vol 1 (13) ◽  
pp. 89
Author(s):  
G.D. Khaskhachikh ◽  
G.A. Tsaturiyan ◽  
Ya. S. Shulgin
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Coast Line ◽  
Black Sea Coast ◽  
Concrete Blocks ◽  
Stone Material ◽  
Rubble Mound ◽  
The Waves ◽  
Sea Coast ◽  
Protection Structures

Along some length of the Black Sea coast line there are beach protection structeres largely represented by groins and traverses in conjunction with wave resisting embankment walls. The groins are built of 30 to 100 t concrete blocks and set on a rubble-mound foundation levelled by sea divers. In the course of building and exploitation of these structures, a number of disadvantages have been revealed. These ares - The groin structure is affected by the waves that scour the rubble-mound foundation at the bottom and thereby disturb it. Failures occur more frequently at the head (seaward) part of the groin; - The rubble-mound is concerned with having to perform a great deal of heavy and harmful to health diving job, such as underwater excavation, filling and levelling the stone material, etc.; - The rubble-mound cost and labour involved are estimated to be high.

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