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Propagation Loss Modelling on the Scotian Shelf: Comparison of Model Predictions with Measurements

  • Dale D. Ellis
  • D. M. F. Chapman
Part of the NATO Conference Series book series (NATOCS, volume 5)

Abstract

Propagation loss data using explosive sources have been obtained over a 180 km track on the Scotian Shelf during both summer and winter conditions. The water depth varies between 55 and 75 meters over a sandy bottom. A sub-bottom model is discussed in the accompanying paper, “Propagation Loss Modelling on the Scotian Shelf: The Geo-acoustic Model”. In the present paper the bottom properties determined from the geo-acoustic model are used as part of the input to the DREA range-dependent normal mode program. The predictions from the normal mode calculations are compared with the summer and winter propagation loss measurements for a number of ranges, depths and frequencies. The difference between the calculations and measurements can be used to refine the geo-acoustic model.

Keywords

Attenuation Coefficient Sound Speed Propagation Loss Summer Data Bottom Roughness 
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.
    D.M.F. Chapman and D.D. Ellis, “Propagation-loss modelling on the Scotian Shelf: The geo-acoustic model”, elsewhere in the proceedings.Google Scholar
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    A. Nagl, H. Uberall, A.J. Haug and G.L. Zarur, “Adiabatic mode theory of underwater sound propagation in a range-dependent environment”, J. Acoust. Soc. Am., 63:739 (1978).CrossRefGoogle Scholar
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    J. Beebe, “Long-range propagation over a mixed-sediment, sloping bottom”, J. Acoust. Soc. Am., Suppl. 1, 67:S30 (1980).CrossRefGoogle Scholar
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    D.J. Dodds, Huntec (’70) Ltd., informal communication.Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • Dale D. Ellis
    • 1
  • D. M. F. Chapman
    • 1
  1. 1.Defence Research Establishment AtlanticDartmouthCanada

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