An Experiment on the Nonbreaking Surface-Wave-Induced Vertical Mixing

Dai, Dejun; Qiao, Fangli; Sulisz, Wojciech; Han, Lei; Babanin, Alexander V.

doi:10.1175/2010jpo4378.1

Cited by 88 publications

(80 citation statements)

References 27 publications

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“…Nevertheless, the turbulent viscosity model is not widely recognized yet, as far as its full and regular justification does not exist. On the other hand, some experimental results in the field of studying the wave-induced turbulence have already appeared [20,32,33] and this fact stimulates our efforts in this field.…”

Section: General Ideas and Objectives Of The Workmentioning

confidence: 94%

Spectral Description of the Dissipation Mechanism for Wind Waves. Eddy Viscosity Model

Polnikov¹

2012

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The objective of this paper is to perform a theoretically justified parameterization of the dissipation function for wind waves in the spectral form. To solve the problem, the similarity method was used: similarity statements are formulated; dimensionless characteristics of the system are introduced; and general phenomenological representation of the dissipation function for wind waves DIS(S) is constructed. The only additional assumption is that this presentation is valid in a local approximation in the wave spectrum S. Physical analysis of the general representation allows us to reduce the dissipation function to the form DIS(S) ∝ S 2 . The further systematic formulation of the final representation of phenomenological function DIS(S) is performed by joining numerous previous results of the author. The physical meaning of the accepted parameterization parameters is analysed, and the correspondence of the parameterization with the new experimental facts found in this field for the last 5-10 years is shown. The previous numerical results are presented that illustrate a successful application of the constructed dissipation function. A regular theoretical justification of the revealed phenomenological representation of DIS(S) is based on the well-known Hasselmann's approach [1]. This theory was modified by the system of postulates resulting in the dissipation mechanism realized due to turbulence in the upper water layer. Physically it means the eddy viscosity mechanism of wind wave dissipation. The final theoretical representation of the dissipation function corresponds to the phenomenological formulation: DIS(S) ∝ S 2 . This fact provides the physical justification of the phenomenological approach proposed.

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Section: General Ideas and Objectives Of The Workmentioning

confidence: 94%

Spectral Description of the Dissipation Mechanism for Wind Waves. Eddy Viscosity Model

Polnikov¹

2012

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“…Instead, the existence or nonexistence of turbulence was decided by a more subjective criterion, being whether or not the experimenters had judged the dye to have sufficiently dispersed. The weak, intermittent turbulence observed by Babanin and Haus would only be expected to create a visual difference after several hundred periods (see also Dai et al, 2010). Beyá et al (2012) only observed their dye over 5-10 wave periods, so they could not have seen any significant effect visually.…”

Section: Appendix B the Experimental Paper By Beyá Et Al (2012)mentioning

confidence: 95%

“…We note also that the B v model was applied with considerable success in modelling a controlled laboratory experiment for temperature diffusion in a wave tank (Dai et al, 2010).…”

Section: The B V Parameterisation Of Qiao Et Al (2004)mentioning

confidence: 98%

“…Since an efficient mixing due to wave motion as well as an efficient mechanism for wave attenuation have been observed in laboratory experiments with no reported Langmuir circulation (Dai et al, 2010;Babanin and Haus, 2009;Ölmez and Milgram, 1992), and this mechanism should in principle always exist, we make the assumption that Langmuir circulation is a minor contributor to the mixing. Thus we follow several other authors in applying a vertical distribution of turbulent kinetic energy that does not explicitly take into account Langmuir circulation, and it is to these approaches that we compare ours.…”

Section: Existing Parameterisationsmentioning

confidence: 99%

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One-dimensional modelling of upper ocean mixing by turbulence due to wave orbital motion

Ghantous

Babanin

2014

Nonlin. Processes Geophys.

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Abstract. Mixing of the upper ocean affects the sea surface temperature by bringing deeper, colder water to the surface. Because even small changes in the surface temperature can have a large impact on weather and climate, accurately determining the rate of mixing is of central importance for forecasting. Although there are several mixing mechanisms, one that has until recently been overlooked is the effect of turbulence generated by non-breaking, wind-generated surface waves.Lately there has been a lot of interest in introducing this mechanism into ocean mixing models, and real gains have been made in terms of increased fidelity to observational data. However, our knowledge of the mechanism is still incomplete. We indicate areas where we believe the existing parameterisations need refinement and propose an alternative one.We use two of the parameterisations to demonstrate the effect on the mixed layer of wave-induced turbulence by applying them to a one-dimensional mixing model and a stable temperature profile. Our modelling experiment suggests a strong effect on sea surface temperature due to non-breaking wave-induced turbulent mixing.

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“…The second generation mechanism was considered main at the initial stage of marine subsurface turbulence development [5,12]. Later, semiempirical models, where the wave breaking mechanism was considered main, were proposed [6,10,11]. However, over the last years an issue of wind-generated sea wave turbulence importance became urgent again [9 -11].…”

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confidence: 99%

Turbulence Induced by Storm Waves on Deep Water

Kuznetsov¹,

Saprykina²,

Дулов³

et al. 2015

PhO

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Results of laboratory and field experiments performed in November-December, 2014 to study turbulence induced by wave motion are represented. Elevations of free sea surface and fluctuations of three components of water particle velocity are synchronously measured at calm conditions when wave breaking is absent. The data is obtained in the ranges of wave and turbulence frequencies, and in the depth range from the surface to half a length of surface waves. A method for separating the measured velocity fluctuations into at a wave and two turbulence components (the one is induced by wave motions and another is a background hydrodynamic turbulence) is developed. In field experiments the bound frequency of ~0.8 Hz had been determined. The coherence of the turbulent fluctuations and sea surface elevations sharply decreases above this frequency. Direct instrumental measurements confirmed stratification of a wave flow into a near-surface turbulent layer induced by wave motion and an underlying layer with the background hydrodynamic turbulence. The characteristics of turbulence in a near-surface layer are connected linearly with magnitude of envelope of vertical component velocity. This fact enables to attribute the turbulent fluctuations in this layer to wave-induced turbulence. Based on analysis of experiments the conclusion about existence of wave-induced turbulence in absentia other sources of turbulence such as wave breaking, wind stresses and Langmuir circulations is drawn. Introducton. According to the definition given by A.S. Monin and R. V. Ozmidov, turbulence is a phenomenon observed in many liquid and gas flows, and is that thermodynamical and hydrodynamical characteristics of such flows (velocity, temperature, density, pressure etc.) undergo chaotic fluctuations (caused by numerous vortices of different sizes in these flows) and owing to this change from point to point and in the course of time irregularly [1]. The occurrence of the turbulent velocity pulsations of water particles in a wave flow was experimentally registered for the first time with the light-polarization method by A. A. Dmitriev and T. V. Bonchkovskaya. In their paper are represented three consecutive photos of wave propagation at the still water, showing the leading wavefront to move farther from the survey point and the greater (by height) surficial area of flow to be involved in turbulent motion [2].The existence of laminar and turbulent mode areas in laboratory wave flow at the deep water was registered by S. V. Dobroklonsky and N. V. Kontoboytseva by means of Reynolds color jet method. Grains of paint were dropped into the water (during the disposition they left thin vertical traces), then wave generator was turned on and the observations, fixing the colored traces to keep their individuality, were performed [3]. As a result, the following facts were ascertained: turbulence is initiated in the upper flow layer with δ > 0.021 wave steepness; 2) subsurface turbulent layer thickness l T is linearly linked with wave height and length: 0.75 0.0...

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An Experiment on the Nonbreaking Surface-Wave-Induced Vertical Mixing

Cited by 88 publications

References 27 publications

Spectral Description of the Dissipation Mechanism for Wind Waves. Eddy Viscosity Model

Spectral Description of the Dissipation Mechanism for Wind Waves. Eddy Viscosity Model

One-dimensional modelling of upper ocean mixing by turbulence due to wave orbital motion

Turbulence Induced by Storm Waves on Deep Water

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