Acoustical Physics

, Volume 53, Issue 3, pp 305–312 | Cite as

Transmission of low-frequency sound through the water-to-air interface

  • O. A. Godin
Article

Abstract

L.M. Brekhovskikh revealed and studied the important role played by inhomogeneous waves emitted by a point source when they pass through an interface with a medium in which the velocity of sound is lower, for example, from water to air. This paper studies the energy characteristics of sound emitted into air by an underwater point source. The energy transfer due to inhomogeneous waves is shown to cause the phenomenon of anomalous transparency of the interface for low-frequency sound. The anomalous transparency manifests itself in that the energy flux through the interface increases with decreasing frequency of sound and, at sufficiently low frequencies, almost all of the acoustic energy produced by the underwater source is emitted into air. Conversely, at high frequencies, when the contribution of the inhomogeneous waves becomes negligible, the water-to-air interface is similar to a perfectly reflecting surface and almost all of the acoustic energy produced by the source is emitted into water. The anomalous transparency phenomenon changes the conventional opinion on the possibility of acoustic coupling between points in water and air and on the role played by physical processes evolving in the water column in generating atmospheric acoustic noise.

PACS numbers

43.20.E1 43.28.Dm 43.30.Jx 

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References

  1. 1.
    A. D. Pierce, Acoustics. An Introduction to Its Physical Principles and Applications (AIP, New York, 1994).Google Scholar
  2. 2.
    M. A. Isakovich, General Acoustics (Nauka, Moscow, 1973) [in Russian].Google Scholar
  3. 3.
    R. W. Young, J. Acoust. Soc. Am. 53, 1708 (1973).CrossRefGoogle Scholar
  4. 4.
    L. M. Brekhovskikh, Usp. Fiz. Nauk 38, 1 (1949).Google Scholar
  5. 5.
    L. M. Brekhovskikh and O. A. Godin, Acoustics of Layered Media (Nauka, Moscow, 1989; Springer-Verlag, Berlin, 1990) [in Russian].Google Scholar
  6. 6.
    L. M. Brekhovskikh and O. A. Godin, Acoustics of Layered Media. 2: Point Sources and Bounded Beams, 2nd ed. (Springer-Verlag, Berlin, 1999).Google Scholar
  7. 7.
    Handbook of Mathematical Functions, edited by M. Abramowitz and I. A. Stegun (Dover, New York, 1965; Nauka, Moscow, 1979).Google Scholar
  8. 8.
    F. G. Bass and I. M. Fuchs, Wave Scattering from Statistically Rough Surfaces (Nauka, Moscow, 1972; Pergamon Press, Oxford, 1978).Google Scholar
  9. 9.
    A. G. Voronovich, Doctoral Dissertation in Physics and Mathematics (Akust. Inst., Moscow, 1987).Google Scholar
  10. 10.
    V. V. Zamashchikov and N. A. Kakutkina, Akust. Zh. 37, 484 (1991) [Sov. Phys. Acoust. 37, 248 (1991)].Google Scholar
  11. 11.
    F. I. Vafina, I. I. Gol’dfarb, and I. R. Shreĭber, Akust. Zh. 38, 260 (1992) [Sov. Phys. Acoust. 38, 139 (1992)].Google Scholar
  12. 12.
    Z. M. Orenbakh and G. A. Shushkov, Akust. Zh. 39, 127 (1993) [Acoust. Phys. 39, 63 (1993)].Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  • O. A. Godin
    • 1
  1. 1.Cooperative Institute for Research in Environmental SciencesUniversity of Colorado at Boulder and NOAA Earth System Research LaboratoryBoulderUSA

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