Manifestation of Surfactant Film in Snell’s Window Image: Numerical Experiment
https://doi.org/10.7868/S2073667321030096
Abstract
The present paper continues a series of studies on using underwater images of the sky (Snell’s window) to retrieve characteristics of wind-driven waves and their variations in the field of near-surface hydrophysical processes and under influence of surfactant films. Research is based on the previously developed mathematical models of the Snell’s window image and two statistical moments, the Elfouhaily spectrum of wind-driven waves, the Ermakov model of wave damping by a thin film, and the Cox-Munk result for a thick oil film. Varying wind, wave, and film parameters in the numerical experiment, we demonstrated a sensitivity of considered statistical moments to changes in wind-wave conditions and viscoelastic characteristics of films. To distinguish film influence from wind weakening having similar manifestations, a series of real underwater images demonstrating the changes in the spot structure with the passing surfactant film through the observed sea surface area were analyzed. The obtained results demonstrate that presented method can be useful in practice for detecting surfactant films with the help of optical recorders fixed under the buoys, for example.
Keywords
remote sensing,
underwater imagery,
Snell’s window,
sea roughness,
wind waves,
wave spectra,
slope variance,
surfactant film,
slick
Supporting agencies: This research was supported by the Russian foundation of basic research (Grant No 19-35-60034). The data of field measurements used in section D were obtained during the expedition under the RSF project No 18-77-10066.
About the Author
A. A. Molkov
A.M. Obukhov Institute of Atmospheric Physics, RAS; Institute of Applied Physics, RAS
Russian Federation
Russian Federation
119017, Pyzhyovskiy Per., 3, Moscow
603950, Ulyanova Str., 46, Nizhny Novgorod
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Review
For citations:
Molkov A.A. Manifestation of Surfactant Film in Snell’s Window Image: Numerical Experiment. Fundamental and Applied Hydrophysics. 2021;14(3):98-110. https://doi.org/10.7868/S2073667321030096
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