Archives of Acoustics, 20, 1, pp. 39-56, 1995

Statistical aspects of acoustic returns from a wind-driven water surface covered with organic films

S.J. Pogorzelski
Environmental Acoustics Laboratory, Institute of Experimental Physics, University of Gdańsk, 80-952 Gdańsk, Wita Stwosza 57

The statistical properties of ultrasonic (10 MHz) signals scattered at a wind-driven water surface covered with different petroleum derivative films of well-defined and oceanographically relevant elastic surface properties were examined under laboratory and open-sea conditions. Evolution of the shape, skewness and kurtosis parameters of the signal distribution as a function of wind speed reflects a principal role played by the ftIm elasticity. The elastic properties of composite sea surfaces likely to be present in nature and consisting of oil spills filled with a surface active material, floating solid particles, bubbles or drops of a third fluid with their important implications in remote sensing techniques are also discussed. A two-spatial scale irregularities distribution of the sea surface (capillary ripples present on tilted faces of long gravity waves) expresses itself in the corresponding signatures of at-sea experiment data.
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