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Effects of shear elasticity on sea bed scattering: numerical examples
1Andreev Acoustics Institute, Moscow, Russia.
The Journal of the Acoustical Society of America
|January 24, 1998
Summary
Marine sediment elasticity affects wave scattering. Shear waves significantly alter scattering in sedimentary rock but have minimal impact on sandy seabeds, influencing volume versus roughness scattering.
Area of Science:
- Geophysics
- Acoustics
- Marine Geology
Background:
- Marine sediments transmit both compressional and shear waves.
- Previous research has not fully explored shear wave influence on seabed scattering.
Purpose of the Study:
- Investigate the impact of elasticity, specifically shear waves, on acoustic scattering from different seabed types.
- Analyze scattering phenomena in both bistatic and monostatic configurations.
Main Methods:
- Utilized a perturbation model for joint roughness-volume scattering.
- Examined three distinct seabed types: sedimentary rock, high shear speed sand, and normal shear speed sand.
Main Results:
- For sedimentary rock, shear elasticity enhances volume scattering and reduces roughness scattering compared to fluid models.
- Shear effects on acoustic scattering were found to be negligible for sandy seabed types.
Conclusions:
- Seabed material properties, particularly shear elasticity, play a crucial role in acoustic wave scattering.
- The findings highlight the importance of considering elastic properties for accurate geophysical and acoustic modeling of marine environments.
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