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Yong-Min Jiang1, N Ross Chapman

  • 1School of Earth and Ocean Sciences, University of Victoria, PO Box 3055 Victoria, British Columbia,V8W 3P6, Canada.

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This study successfully inverted geoacoustic properties using Bayesian methods on the New Jersey continental shelf. Results for sediment sound speeds closely matched ground truth data.

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Area of Science:

  • Oceanography
  • Acoustics
  • Geophysics

Background:

  • Geoacoustic inversion is crucial for understanding seafloor properties.
  • Variations in water column sound speed complicate acoustic propagation.
  • Accurate geoacoustic models are essential for sonar performance and seismic surveys.

Purpose of the Study:

  • To perform matched field Bayesian geoacoustic inversion using multitonal continuous wave data.
  • To accurately determine sediment sound speeds in a dynamic marine environment.
  • To validate inversion results against known ground truth data.

Main Methods:

  • Utilized matched field Bayesian geoacoustic inversion techniques.
  • Modeled water column sound speed variations using empirical orthogonal functions.
  • Estimated data error from multiple time windows for robust inversion.

Main Results:

  • Achieved excellent agreement between inverted sediment sound speeds and ground truth.
  • Demonstrated the effectiveness of the Bayesian approach in complex environments.
  • Successfully accounted for spatial and temporal sound speed variations.

Conclusions:

  • The applied geoacoustic inversion method is effective for determining seafloor properties.
  • Empirical orthogonal functions adequately represent sound speed variations.
  • The study validates the accuracy of the inversion technique on the New Jersey continental shelf.