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Some Bottom-Reflection Loss Anomalies near Grazing and Their Effect on Propagation in Shallow Water

  • Ole F. Hastrup
Part of the NATO Conference Series book series (NATOCS, volume 5)

Abstract

The bottom-reflection loss near grazing from a hard bottom, or from one that has a hard sub-bottom, can in certain cases be fairly high. This can result in higher propagation losses in shallow water than are usually expected. Two frequently observed cases have been studied, one where the bottom can propagate shear waves and another where the bottom is covered by a layer of soft unconsolidated sediments. The first case causes a low-frequency attenuation whereby an optimum frequency is created for the propagation, whereas the second case creates selected frequencies for which the propagation is poor.

Keywords

Shear Wave Critical Angle Transmission Loss Reflection Loss Grazing Angle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    L. M. Brekjovskikh, “Waves in Layered Media”, Academic Press, New York, N.Y. (1960).Google Scholar
  2. 2.
    F. B. Jensen and M. C. Ferla, SNAP: the SACLANTCEN normal-mode acoustic propagation model, SACLANTCEN SM-121, SACLANT ASW Research Centre, Italy (1979). [AD A 067 256]Google Scholar
  3. 3.
    F. B. Jensen and W. A. Kuperman, Environmental acoustic modelling at SACLANTCEN, SACLANTCEN SR-34, SACLANT ASW Research Centre, La Spezia, Italy (1979). [AD A 081 853]Google Scholar
  4. 4.
    E. L. Hamilton, Acoustic properties of the sea floor: A review, in: “Ocean Acoustic Modelling”, W. Bachmann and R.B. Williams, eds., Proceedings of a Conference at La Spezia, Italy, 8–11 Sep 1975, Part 4: Sea bottom, SACLANTCEN CP-17, SACLANT ASW Research Centre La Spezia, Italy (1975), pp. 18–1 – 18–96. [AD A 020 936/1G1]Google Scholar
  5. 5.
    E. T. Kornhausen and W. P. Raney, Attenuation in shallow- water propagation due to an absorbing bottom, J. Acoustical Society America 27:689–692 (1955).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • Ole F. Hastrup
    • 1
  1. 1.SACLANT ASW Research CentreLa SpeziaItaly

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