Features of Wind Wave–Induced Turbulence in Water According to Measurements in a Wind-Wave Tank

Polnikov, V.G.; Qiao, F.; Repina, I.A.

Авторы: Polnikov V.G., Qiao F., Repina I.A.
Журнал: Izvestiya - Atmospheric and Oceanic Physics
Том: 57
Номер: 5
Год издания: 2021
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
Первая страница: 504
Последняя страница: 520
DOI: 10.1134/s0001433821050121
Аннотация: Three velocity components ui (i = x, y, z) have been measured in a wind-wave tank at three levels in water in the presence of wind waves. The degree of anisotropy of a wind wave–induced turbulence and the rate of its dissipation ε are estimated versus system parameters. For this, standard deviations σi and the frequency spectra Si(f) are calculated for the components of the flows measured, as well as σiF and SiF(f) for the turbulent components of the flows with filtered wave motions. The following is ascertained: (a) the turbulence is not isotropic; (b) σx > σy > σz and σxF> σyF> σzF; and (c) more than 70% of the kinetic energy is contained in the turbulent components of flow fluctuations. The spectra of the horizontal velocity components are similar in shape and intensity. In the frequency range below wave spectrum peak frequency fp, spectra Si(f) of all the flow components decay by the power law with the exponent equal to –1.7 ± 0.1. In the frequencyrange f > 2fp, spectra Sx(f) and Sy(f) are close in intensity and their decay obeys the same law, but the intensities of the spectra of the vertical component Sz(f) are almost an order of magnitude weaker and spectra Sz(f),in the presence of a power-law tail, decay by the law –2.0 ± 0.1. These segments of the spectra are interpreted as analogs of the Kolmogorov spectra. The intensity of spectra Sz(f) was used to estimate the turbulence dissipation rate ε. Semiempirical parameterizations of the dependences of σiF and ε on wave parameters and the measuring depth are constructed; their differences from the known parameterizations and possible causes of features of the spectra Si(f) are discussed.
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Features of Wind Wave–Induced Turbulence in Water According to Measurements in a Wind-Wave Tankстатья

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