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Model for the frequency spread of backscattered underwater sound based on the facet model of the rough sea surface

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Abstract
A theoretical model for the doppler spread of backscattered acoustic waves from the rough sea surface is described on the basis of the decomposition of the continuous sea-surface spectrum that leads to the concept of facets. The facet statistics are derived for a gaussian sea surface. The results are evaluated for a Pierson-Moskowitz spectrum. A procedure for choosing the facet length is developed. Approximate, simple formulas for the Pierson-Moskowitz case are given. The general result for the doppler spread of the backscattered acoustic wave is evaluated for sea-surface spectrum due to Scott, and examples for doppler spectra are given for different windspeeds, wind directions, grazing angles, and acoustic frequencies.

URI
http://hdl.handle.net/20.500.12489/255

Report Number
SR-26

Source
In: Journal of the Acoustical Society of America, 1978, vol. 64, no. 2, pp. 605-613.

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  • Reprints

Date
1978/11

Author(s)
Schwarze, Herward

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