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Fractal laws of sound backscattering by sea surface and bottom

Lyamshev L. M., Stepnowski A.

Hydroacoustics

2001

Vol. 4

143--148

It is demonstrated that the known empirical frequency-angle dependence that characterizes the intensity of high-frequency backscattering of sound by a rough sea surface and is obtained on the basis of generalization of results of many experiments conducted by various researchers under different conditions and in different sea regions has a fractal character. High-frequency backscattering of sound by the sea bottom is also characterized by fractal laws in a broad range of frequency and spatial scales.

Nonspecular reflection, resonance scattering and radiation of sound by elastic bodies in water

Lyamshev L. M.

Hydroacoustics

1999

Vol. 2

297--300

Results of studies of sound reflection by plates and shells immersed in water are given. The are incidence angles of sound waves upon plates or shells, under which strong reflection backwards, i.e. nonspecular reflection, is observed. Physical nature of nonspecular reflection is discussed and its theory is given. It is demonstrated that nonspecular reflection is accompanied by the effect of spatial-frequency resonance. It is revealed that resonance scattering and radiation of sound by shells immersed in water is connected with the effect of spatial frequency resonance. The discussed effects can play the dominant role in formation of underwater acoustic fields.

Fractals in underwater acoustics

Lyamshev L. M.

Hydroacoustics

1997

Vol. 1

251--256

The concept of fractals and their applications for underwater acoustics are discussed. Waves scattering by a fractal surface is considered. Ray chaos in the case of waves propagation in inhomogeneous underwater waveguides is discussed. Results of investigation of multifractal characteristics of flow noise, cavitation noise (acoustic turbulence) and the noise emitted by elastic structures are given.