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Acoustic field variability induced by time evolving internal wave fields

Finette1, Orr, Turgut

  • 1Acoustics Division, Naval Research Laboratory, Washington, DC 20375-5320, USA.

The Journal of the Acoustical Society of America
|September 29, 2000
PubMed
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A new model simulates acoustic variability in shallow waters by linking oceanographic internal waves to sound speed changes. This helps understand how these waves affect underwater sound propagation and signal structure.

Area of Science:

  • Oceanography
  • Acoustics
  • Environmental Modeling

Background:

  • Shallow water environments exhibit complex acoustic variability.
  • Internal waves significantly influence sound speed distribution in the water column.
  • Understanding these oceanographic features is crucial for accurate acoustic propagation modeling.

Purpose of the Study:

  • To develop a space- and time-dependent internal wave model for shallow water.
  • To combine this model with a propagation algorithm for numerical simulations.
  • To analyze the impact of internal waves on acoustic field fluctuations.

Main Methods:

  • Developed a data-constrained environmental model linking oceanography to sound speed.
  • Utilized environmental measurements to parameterize internal wave influence.

Related Experiment Videos

  • Reconstructed acoustic propagation environment using acoustic inversion techniques.
  • Synthesized a time-varying sound speed field from linear and nonlinear internal wave components.
  • Employed an elastic parabolic equation for acoustic simulations at 224 and 400 Hz.
  • Used modal decomposition to analyze received acoustic signals.

    • Main Results:

    • Characterized the influence of internal waves on sound speed perturbations.
    • Simulated acoustic propagation through a dynamic, data-informed environment.
    • Demonstrated the effects of internal waves on the complex structure of acoustic signals.
    • Quantified the impact of both diffuse and localized internal wave components on sound propagation.

    Conclusions:

    • The developed model accurately represents the influence of internal waves on acoustic variability.
    • Internal waves, including solitary waves, are key drivers of sound speed fluctuations in the studied region.
    • The findings enhance the understanding of acoustic propagation in dynamic shallow water environments.