Wave tank study of phase velocities and damping of gravity-capillary wind waves in the presence of surface films

Ермаков, С. А.; Sergievskaya, Irina; Zuikova, E.M.; Goldblat, V.Yu.; Shchegolkov, Yury B.

doi:10.1007/3-540-33271-5_13

Cited by 6 publications

(19 citation statements)

References 5 publications

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“…These waves can be freely propagating, or they can be bound to waves of decimeter wavelength, whose spectral density may be influenced by sea slicks (Gade et al, 1998b;Ermakov et al, 2006). A 10 GHz (X-band) scatterometer and a video (CCD) camera were both looking upwind at the same spot on the water surface, at 14.5 m fetch and under an incidence (look) angle of 38°.…”

Section: Basic L Abor Atory Studiesmentioning

confidence: 99%

Slicks as Indicators for Marine Processes

Gade¹,

Byfield²,

Ермаков³

et al. 2013

oceanog

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Section: Basic L Abor Atory Studiesmentioning

confidence: 99%

Slicks as Indicators for Marine Processes

Gade¹,

Byfield²,

Ермаков³

et al. 2013

oceanog

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“…The accumulation and enrichment of surfactants within the upper 1 mm or so of the ocean gives rise to the physically, chemically, and biologically distinct SML. Consequently, the SML represents an important interface at the ocean‐surface which helps regulate global biogeochemical cycles and climate‐related processes by altering the production and composition of marine sea spray aerosol (SSA) particles, modifying the air‐sea transfer of gas, impacting the evolution of the wave spectrum, and by providing a habitat to a distinct marine ecosystem known as the neuston [e.g., Ermakov et al ., ; Upstill‐Goddard , ; Russell et al ., ; Salter et al ., ; Cunliffe et al ., ].…”

Section: Introductionmentioning

confidence: 99%

On the imprint of surfactant‐driven stabilization of laboratory breaking wave foam with comparison to oceanic whitecaps

2017

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Surfactants are ubiquitous in the global oceans: they help form the materially‐distinct sea surface microlayer (SML) across which global ocean‐atmosphere exchanges take place, and they reside on the surfaces of bubbles and whitecap foam cells prolonging their lifetime thus altering ocean albedo. Despite their importance, the occurrence, spatial distribution, and composition of surfactants within the upper ocean and the SML remains under‐characterized during conditions of vigorous wave breaking when in‐situ sampling methods are difficult to implement. Additionally, no quantitative framework exists to evaluate the importance of surfactant activity on ocean whitecap foam coverage estimates. Here we use individual laboratory breaking waves generated in filtered seawater and seawater with added soluble surfactant to identify the imprint of surfactant activity in whitecap foam evolution. The data show a distinct surfactant imprint in the decay phase of foam evolution. The area‐time‐integral of foam evolution is used to develop a time‐varying stabilization function, ϕ(t) and a stabilization factor, normalΘ, which can be used to identify and quantify the extent of this surfactant imprint for individual breaking waves. The approach is then applied to wind‐driven oceanic whitecaps, and the laboratory and ocean normalΘ distributions overlap. It is proposed that whitecap foam evolution may be used to determine the occurrence and extent of oceanic surfactant activity to complement traditional in‐situ techniques and extend measurement capabilities to more severe sea states occurring at wind speeds in excess of about 10 m/s. The analysis procedure also provides a framework to assess surfactant‐driven variability within and between whitecap coverage data sets.

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“…Films on the sea surface remain a phenomenon intensively studied in marine hydrophysics, marine biology and ecology [1][2][3][4][5]. The study of surface-active substances (SAS) films of anthropogenic origin as a marine pollution indicator is necessary for the development and improvement of satellite monitoring systems for unauthorized oil spills, especially the consequences of accidents on oil platforms and ships [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Spectral Contrasts of Short Wind Waves in Artificial Slicks from the Sea Surface Photographs

Дулов¹,

Yurovskaya²

2021

PhO

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Purpose. The aim of the work is to evaluate the contrasts between the two-dimensional spectra of the short wind waves on a clean sea surface and on the surface covered by a thin film of vegetable oil. The contrast angular dependence, which is still not understood, is of particular interest. The study is intended to widen the base of empirical notions of wave suppression on the surfactant films in field conditions. Its results may be useful both for theoretical modeling the short wind wave spectra, and for developing the methods for remote monitoring of the ocean. Methods and Results. The contrasts were assessed by analyzing the sea surface photographs taken from the Platform of the Black Sea hydrophisical subsatellite polygon (Katsiveli) during the specialized experiments aimed at obtaining artificial slicks using vegetable oil spills. The applied in the study simple method for estimating the contrasts is based on the assumptions of a linear relationship between the brightness and the sea surface slope, and of the invariability of the brightness – slope transfer function at transition from a clean sea surface to a slick. In contrast to the previously applied methods, this approach makes it possible to obtain the contrasts varying both in wavenumber and direction. Obtaining the estimates of the shortest wave characteristics usually constitutes the utmost technical difficulty. In the work, the spectral contrasts are evaluated for the wind waves whose lengths are from ~ 20 to ~ 1 cm. Conclusions. At moderate wind speeds (6–8 m/s), the obtained contrasts increase monotonically with the wavenumber up to the values ~ 10. Under calm conditions (wind speed 0.5 m/s), the spectral contrast maximum (~ 30–50) is observed at the wavenumber peak ~ 100 rad/m that is qualitatively confirmed by the estimates from a string wave gauge. These results are consistent with the previous measurements performed by the other authors. The two-dimensional contrast distributions are anisotropic with the maximum in the direction perpendicular to the wind one. At moderate winds, the anisotropy increases with growth of a wavenumber.

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Wave tank study of phase velocities and damping of gravity-capillary wind waves in the presence of surface films

Cited by 6 publications

References 5 publications

Slicks as Indicators for Marine Processes

Slicks as Indicators for Marine Processes

On the imprint of surfactant‐driven stabilization of laboratory breaking wave foam with comparison to oceanic whitecaps

Spectral Contrasts of Short Wind Waves in Artificial Slicks from the Sea Surface Photographs

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