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Geoacoustic inversion of short range source data using a plane wave reflection coefficient approach.

S A Stotts1, D P Knobles, J A Keller

  • 1Applied Research Laboratories, The University of Texas at Austin, P.O. Box 8029, Austin, Texas 78713-8029, USA.

The Journal of the Acoustical Society of America
|January 18, 2007
PubMed
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This study demonstrates that isolating bottom-interacting acoustic paths is crucial for accurate geoacoustic parameter inversion in shallow lake environments. This method refines models and predicts sound transmission loss effectively.

Area of Science:

  • Underwater acoustics
  • Geoacoustics
  • Environmental acoustics

Background:

  • Shallow, hard-bottom lake environments present unique challenges for acoustic propagation modeling.
  • Accurate geoacoustic parameter estimation is vital for understanding sound behavior in aquatic settings.

Purpose of the Study:

  • To investigate the effectiveness of matched field inversions for characterizing a shallow Texas lake's geoacoustic properties.
  • To determine the essential role of bottom-interacting paths in reducing parameter uncertainty.

Main Methods:

  • Collected acoustic time series data using short and long-range implosive and explosive sources.
  • Performed matched field inversions with simulated annealing and a validated forward propagation model.
  • Isolated bottom-interacting paths to refine geoacoustic parameter estimation.

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Main Results:

  • Isolating bottom-interacting paths significantly reduced parameter uncertainties in the hard-bottom lake environment.
  • The inversion approach successfully established the number of layers needed to model the environment.
  • Modeled transmission loss closely matched measured data, validating the inversion methodology.

Conclusions:

  • The study confirms the necessity of considering bottom-interacting paths for accurate geoacoustic inversion in shallow, hard-bottom environments.
  • Geoacoustic parameters derived from low-frequency data can reliably predict transmission loss at higher frequencies and longer ranges.
  • The developed inversion technique provides a systematic approach for characterizing complex aquatic acoustic environments.