Characteristics of inertial oscillations according to the experimental measurements of currents on the Russian shelf of the Black Sea

Bondur, V. G.; Sabinin, K. D.; Grebenyuk, Yu. V.

doi:10.1134/s0001433816050030

Cited by 13 publications

(3 citation statements)

References 7 publications

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“…2, the currents show no correspondence with Ekman's stationary theory. In the open sea part, the velocity vectors turn clockwise with time and do not show a relation with the level gradients, which is typical of inertial flows [10][11][12][13][14][15]. Correspondence with the gradient level is visible only in coastal areas.…”

Section: Description Of the Technology For Obtaining The Calculated Felds Of Currents And Their Analysismentioning

confidence: 99%

Spatial-temporal variability of inertial currents in the eastern part of the Black Sea in a storm period

Diansky

Фомин

Grigoriev

et al. 2019

PhO

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Analysis of numerical simulation of the inertial oscillations evolution in a storm period in the northeastern Black Sea is represented in comparison with the observations and the analytical solutions. The simulations confirm significant contribution of the inertial motions to formation of the velocity fields. It is shown that inertial oscillations do not affect the sea level changes and their character depends on vertical structure of the sea upper mixed layer. Data and methods. Comparison the simulation results to the drift observations in the Black Sea were represented. It is noted that intensity of inertial oscillations in the deep-sea areas significantly exceeds the one in the shallow areas. At that, contribution of the inertial currents to the Black Sea general circulation in the deep-sea zone is comparable to that of the mesoscale motions. Analytical solution of the inertial oscillations' equation system (taking into account wind and its absence) was studied. Results. Inertial oscillations are excited in the velocity module due to an abrupt change of the wind speed. Moreover, harmonic oscillations are disturbed with depth. After the wind affect is over, the current velocity is barotropized due to fast transition from a quasi-stationary state to another one. It is shown that inertial oscillations are of two time scales conditioned by vertical viscosity. Discussion and conclusion. The first, short time scale is responsible for rapid formation of a new quasi-stationary state. It does not depend on the viscosity coefficient and is approximately equal to two inertial periods. The other, longer scale of the inertial oscillations attenuation, is associated with the energy drain of quasi-stationary oscillations from the upper layers of the sea to the deeper ones. This slow process of attenuation is proportional to the root of time.

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Section: Description Of the Technology For Obtaining The Calculated Felds Of Currents And Their Analysismentioning

confidence: 99%

Spatial-temporal variability of inertial currents in the eastern part of the Black Sea in a storm period

Diansky

Фомин

Grigoriev

et al. 2019

PhO

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“…Previous observations from moored stations have shown that NIW heights vary from 10 to 25 m on the northeastern shelf of the Black Sea [23][24][25]. A variety of forms of inertial hodographs have been revealed on the shelf near the city of Gelendzhik in the northeastern part of the Black Sea [26,27]. Observations with lowered ADCP measurements revealed NIW heights up to 40 m in the northern part of the Black Sea, with a predominance of clockwise rotation of the velocity shear vector with depth [17].…”

Section: Introductionmentioning

confidence: 99%

Observations of Near-Inertial Internal Waves over the Continental Slope in the Northeastern Black Sea

Khimchenko,

Ostrovskii

2024

JMSE

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The article presents observations of near-inertial internal waves (NIWs) in the slope waters of the Black Sea in winter and summer. Rotary spectral analysis of a time series of sea current velocity measurements revealed the prevailing anticyclonic component of the motions near the local inertial frequency f. The clockwise rotation of the velocity vector with depth implies that the NIWs propagate downwards. The amplitude of NIWs usually was 0.1–0.2 m s−1. NIWs were observed in the layer of the permanent pycnocline and the seasonal pycnocline, which attenuate below depths of 160 m and 80 m in winter and summer, respectively. The amplitude of the near-inertial kinetic energy (NIKE) showed a close relationship with vertical stratification. During winter, NIKE exhibited maximum values in the layer of the permanent pycnocline, whereas, in summer, it was primarily observed in the seasonal pycnocline layer. The near-inertial oscillations were generally more energetic in winter.

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“…Of particular interest during remote probing of seas and oceans in these types of research is the study of internal waves (IW) [7], current fields [8,9], and anthropogenic impacts on the aquatic environment [10]. Internal waves propagating in the ocean appear on the sea surface due to horizontal components of orbital velocities near the surface, which lead to variations in the characteristics of short wind waves.…”

Section: Introductionmentioning

confidence: 99%

Method of Studying Modulation Effects of Wind and Swell Waves on Tidal and Seiche Oscillations

Долгих

Budrin

2021

JMSE

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This paper describes a method for identifying modulation effects caused by the interaction of waves with different frequencies based on regression analysis. We present examples of its application on experimental data obtained using high-precision laser interference instruments. Using this method, we illustrate and describe the nonlinearity of the change in the period of wind waves that are associated with wave processes of lower frequencies—12- and 24-h tides and seiches. Based on data analysis, we present several basic types of modulation that are characteristic of the interaction of wind and swell waves on seiche oscillations, with the help of which we can explain some peculiarities of change in the process spectrum of these waves.

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Characteristics of inertial oscillations according to the experimental measurements of currents on the Russian shelf of the Black Sea

Cited by 13 publications

References 7 publications

Spatial-temporal variability of inertial currents in the eastern part of the Black Sea in a storm period

Spatial-temporal variability of inertial currents in the eastern part of the Black Sea in a storm period

Observations of Near-Inertial Internal Waves over the Continental Slope in the Northeastern Black Sea

Method of Studying Modulation Effects of Wind and Swell Waves on Tidal and Seiche Oscillations

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