The Determination of Geoacoustic Models in Shallow Water

  • George V. Frisk
  • James F. Lynch
  • James A. Doutt
Part of the NATO Conference Series book series (NATOCS, volume 16)


A technique for determining geoacoustic models in shallow water is described. For a horizontally stratified ocean and bottom, the method consists of measuring the magnitude and phase versus range of the pressure field due to a CW point source and numerically Hankel transforming these data to obtain the depth-dependent Green’s function versus horizontal wavenumber. In shallow water, the Green’s function contains prominent peaks at horizontal wavenumbers corresponding to the eigenvalues for any trapped and virtual modes excited in the waveguide. A geoacoustic model for the bottom is obtained by computing the theoretical Green’s function for various values of the bottom parameters and determining the parameter set which provides the best agreement with the experimental Green’s function, particularly in the positions and relative magnitudes of the modal peaks. Comparisons are also made between the measured and theoretically computed pressure field magnitudes. The technique is demonstrated using experimental data at 140 Hz and 220 Hz.


Modal Peak Trap Mode Impedance Boundary Condition Virtual Mode Bottom Model 
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  1. 1.
    G.V. Frisk and J.F. Lynch, “Shallow Water Waveguide Characterization Using the Hankel Transform,” J. Acoust. Soc. Am. 76: 205 (1984).CrossRefGoogle Scholar
  2. 2.
    G.V. Frisk, A.V. Oppenheim, and D.R. Martinez, “A Technique for Measuring the Plane-Wave Reflection Coefficient of the Ocean Bottom,” J. Acoust. Soc. Am. 68: 602 (1980).CrossRefGoogle Scholar
  3. 3.
    H. Schmidt and F.B. Jensen, “Efficient Numerical Solution Technique for Wave Propagation in Horizontally Stratified Ocean Environments,” Rep. SM-173, SACLANT ASW Research Centre, La Spezia, Italy (1984).Google Scholar
  4. 4.
    H. Schmidt and F.B. Jensen, “A Full Wave Solution for Propagation in Multilayered Viscoelastic Media with Application to Gaussian Beam Reflection at Fluid-Solid Interfaces,” J. Acoust. Soc. Am. 77: 813 (1985).CrossRefGoogle Scholar
  5. 5.
    F.R. DiNapoli and R.L. Deavenport, “Theoretical and Numerical Green’s Function Field Solution in a Plane Multilayered Medium,” J. Acoust. Soc. Am. 67: 92 (1980).CrossRefGoogle Scholar
  6. 6.
    F.B. Jensen and M.C. Ferla, “SNAP: The SACLANTCEN Normal-Mode Acoustic Propagation Model,” Rep. SM-121, SACLANT ASW Research Centre, La Spezia, Italy (1979).Google Scholar
  7. 7.
    E.L. Hamilton, “Geoacoustic Modeling of the Seafloor,” J. Acoust. Soc. Am. 68: 1313 (1980).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • George V. Frisk
    • 1
  • James F. Lynch
    • 1
  • James A. Doutt
    • 1
  1. 1.Woods Hole Oceanographic InstitutionWoods HoleUSA

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