Abstract
Three components of current velocity ui(i = x, y, z) induced by mechanical waves generated by a wave maker are measured in a wind-wave tank for three variants of dominant frequencies f0 and a set of significant wave heights Hs for each frequency. To study the degree of anisotropy of wave-induced turbulence and estimate its dissipation rate ε, standard deviations (SDs) σi and frequency spectra Si(f) are calculated for the components of the measured currents. By the proposed filtering procedure, the characteristics σiF and SiF(f) are calculated for the turbulent components of currents in which wave motions are filtered. It is shown that the SDs σi exhibit a strong anisotropy the degree of which varies with the variation of the wave parameters. For the turbulent components of the currents, the relation σxF ≈ σyF ≥ (1.5–3)σzF holds, which suggests a significant anisotropy of turbulence in the cases of horizontal and vertical motions. A semiphenomenological approach provides an analytical representation for σiF in terms of wave parameters. The spectra of the turbulent components for the horizontal velocity components SxF(f) and SyF(f) in the frequency range f > 2f0 are similar in shape and intensity and, as a rule, are characterized by a power-law decay in intensity with exponent –1.6 ± 0.1. In the same frequency range, the intensity of the spectra of the vertical velocity component SzF(f) is an order of magnitude lower and decreases according to the power law with exponent –2.0 ± 0.1. The power-law regions are interpreted as analogs of the Kolmogorov spectra due to the up-frequency energy transfer from orbital motions of mechanical waves. A phenomenological model of the spectrum with the decay law –2 is proposed, which makes it possible to determine the dissipation rate ε of the kinetic energy of turbulence from the intensity of the power-law region of Sz(f). Estimates of ε are obtained and its parameterization is constructed. Discussion and possible interpretation of the results are presented.
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ACKNOWLEDGMENTS
We are grateful to colleagues Hongyu Ma and Shumin Jiang and students Xue Wang and Chao Li from the First Institute of Oceanography for participating in the experiments. We are also grateful to anonymous reviewers for their numerous comments that helped significantly improve the text of the article.
Funding
This work was partially supported by the Russian Foundation for Basic Research (project no. 18-05-00161) and by the National Natural Science Foundation of China (project no. 41821004).
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Translated by I. Nikitin
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Polnikov, V.G., Tsyao, F. Characteristics of Turbulence Induced by Mechanical Waves in a Tank. J. Exp. Theor. Phys. 132, 110–126 (2021). https://doi.org/10.1134/S1063776121010039
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DOI: https://doi.org/10.1134/S1063776121010039