Acoustic scattering affected by monomolecular films spread over a wind-driven water surface

Downloads

Authors

  • S. J. POGORZELSKI Environmental Acoustics Laboratory, University of Gdańsk, Poland

Abstract

A spectrum of amplitude fluctuations of the ultrasonic signal scattered from a wind-created water surface covered with an oil substance monolayer of well-defined viscoelastic properties was examined under laboratory conditions. The presence of an oil film causes a shift of the peak frequency towards higher frequencies and increases the fall-off on the high-frequency band of the spectrum if compared to clean surface scattering. The effect turned out to be unequivocally related to rheological parameters of the given monolayer film.

References

[11 A. W. ADAMSON, Physical Chemistry of Surfaces, Wiley, New York 1982.

[2] W. ALPERS, H-J. BLUME, W. D. GARRETT, H. HUHNERFUSS, The effect of monomolecular surface films on the microwave brightness temperature of the sea surface, Int. J. Remote Sensing 3, 457-474 (1982).

[3] W. ALPERS, H. HUHNERFUSS, Radar signatures of oil films floating on the sea surface and the Marangoni effect, J. Geophys. Res. 93, C4, 3642-3648 (1988).

[4] W. ALPERS, H. HUHNERFUSS, The damping of ocean waves by surface films: A new look at an old problem, J. Geophys. Res. 94, C5, 6251-6265 (1989).