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Published on: October 31, 2011
Measurement technique for bottom scattering in shallow water
The Journal of the Acoustical Society of America
|September 29, 2000
Summary
Accurate shallow water sonar predictions require understanding seafloor scattering. New methods reveal frequency-dependent scattering, distinguishing between interface and sub-bottom sources for improved acoustic modeling.
Area of Science:
- Ocean acoustics
- Marine geophysics
Background:
- Shallow water sonar performance relies on accurate seafloor scattering strength estimations.
- Limited understanding exists regarding bottom scattering (400-4000 Hz) and its seafloor physical property dependencies.
Purpose of the Study:
- To develop a novel measurement technique for assessing frequency and angular dependency of bottom-scattering strength.
- To investigate the physical mechanisms controlling seafloor acoustic scattering.
Main Methods:
- Developed and employed a new experimental technique using coherent or incoherent lightbulb sources.
- Measured bottom-scattering strength at two distinct shallow water sites.
Main Results:
- Demonstrated the capability to differentiate scattering from the water-sediment interface versus sub-bottom layers.
- Identified sub-bottom scattering at 23-m depth below 1800 Hz at one site.
- Observed interface scattering at another site.
Conclusions:
- The new technique effectively probes frequency and angular dependencies of bottom scattering.
- Directly revealed sub-bottom scattering, advancing the exploration of scattering mechanisms.
- Provides crucial data for enhancing shallow water sonar performance models.
