Determination of Sediment Sound Speed Profiles Using Caustic Range Information

  • George V. Frisk
Part of the NATO Conference Series book series (NATOCS, volume 5)


A method for determining sediment sound speed profiles is described. It employs measurements, obtained at various receiver heights, of ranges to the caustic which is formed due to a positive gradient in the sediment. The bottom profile can then be obtained from equations, derived using the WKB approximation, which relate the parameters of the water-bottom profile to the caustic range and source/receiver heights. Using an existing result, the theory is presented for the case of an isovelocity ocean overlying a sediment half-space with a linear gradient and continuous sound speed at the water-bottom interface. A new theoretical result is derived for the linear gradient case with a discontinuity at the water-bottom interface. The method is illustrated using data at 220 Hz.


Sound Speed Positive Gradient Source Height Bottom Profile Sound Speed Profile 
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  1. 1.
    G.V. Frisk, J.A. Doutt, and E.E. Hays, “Bottom Interaction of Low-Frequency Acoustic Signals at Small Grazing Angles in the Deep Ocean,” submitted to J. Acoust. Soc. Am.Google Scholar
  2. 2.
    D.A. Sachs and A. Silbiger, “Focusing and Refraction of Harmonic Sound and Transient Pulses in Stratified Media,” J. Acoust. Soc. Am. 49, 824–840 (1971).CrossRefGoogle Scholar
  3. 3.
    D.A. Sachs, “Sound Propagation in Shadow Zones,” J. Acoust. Soc. Am. 51, 1091–1097 (1972).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • George V. Frisk
    • 1
  1. 1.Woods Hole Oceanographic InstitutionWoods HoleUSA

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