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Geoacoustic inversion with two source-receiver arrays in shallow water
Alexey Sukhovich1, Philippe Roux, Marc Wathelet
1Laboratoire de Géophysique Interne et Tectonophysique, Université Joseph Fourier, CNRS UMR 5559, Grenoble 38041, France. alexey.sukhovich@obs.ujf-grenoble.fr
The Journal of the Acoustical Society of America
|August 17, 2010
Summary
This study introduces a double beamforming method for shallow water geoacoustic inversion. It accurately determines seafloor acoustic properties by analyzing sound wave reflections.
Area of Science:
- Oceanography
- Acoustics
- Geophysics
Background:
- Shallow water environments present challenges for acoustic propagation and geoacoustic inversion.
- Understanding seafloor acoustic properties is crucial for sonar performance and underwater communication.
Purpose of the Study:
- To develop and validate a novel geoacoustic inversion scheme using a double beamforming algorithm.
- To extract seafloor acoustic parameters by analyzing multi-reverberated eigenrays.
Main Methods:
- Utilized a double beamforming algorithm to identify eigenrays based on angles and arrival times.
- Analyzed eigenray intensities to derive the bottom reflection coefficient.
- Fitted experimental reflection coefficients with theoretical models for parameter extraction.
Main Results:
- Successfully inverted shear wave speed in a Plexiglas-bottomed tank, showing good agreement with known values.
- Applied the method to at-sea data, modeling sediments as a multi-layered system.
- Obtained quantitative agreement with a prior inversion scheme for Mediterranean coastal waters.
Conclusions:
- The double beamforming algorithm is effective for processing source-receiver array data in geoacoustic inversion.
- Eigenray intensity analysis shows significant potential for shallow water geoacoustic inversion applications.
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