Abstract
The physical influence of the intensification of decimeter waves on a water surface covered by a surfactant film is proposed. The damping of a long wave caused by the loss of its energy on the modulation of short (centimeter) wind waves is analyzed. The damping coefficient of waves of decimeter-meter lengths is calculated, and this coefficient is shown to decrease in the presence of a surfactant film. The strong suppression of the spectrum of centimeter wind waves in a film slick is the physical factor responsible for such a decrease. Due to a decrease in the damping coefficient of decimeter-meter waves, their intensity in the slick increases. Within the framework of a model of the spectrally local energy balance of wind waves, the results of calculations satisfactorily agree with the experiment.
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