Abstract
Presents new extended measurements of wind waves in the presence of artificial organic films, using two optical spectrum analysers, one measuring phase velocities and the other measuring variations of the wavenumber spectrum of the wind waves. It has been found that, in the presence of films, the observed phase velocities are closer to those of free linear gravity-capillary waves than they are in the case of clean water. This can be explained by the bound waves being more strongly damped than the free waves. The relation between bound and free waves is estimated from measurements of phase velocity. Wind ripple damping has been found to be maximum at wavelengths around 5-7 mm. This is in agreement with the predictions of the new mechanism, and it also agrees with field experiments using artificial slicks.
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