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Updated: May 23, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Low frequency seabed scattering at low grazing angles.

Ji-Xun Zhou¹, Xue-Zhen Zhang

¹School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, USA. jixun.zhou@me.gatech.edu

The Journal of the Acoustical Society of America

|April 17, 2012

Summary

This summary is machine-generated.

This study derives low-frequency (LF) seabed backscattering strength (BBS) in shallow water (SW) using reverberation data. The findings enable indirect measurement of LF and low grazing angle (LGA) seabed scattering.

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Area of Science:

Underwater Acoustics
Oceanography
Geophysics

Background:

Direct measurement of low-frequency (LF) seabed scattering at low grazing angles (LGA) in shallow water (SW) is challenging.
Seabed scattering is typically inferred through acoustic reverberation analysis.
Existing models provide a basis for understanding SW reverberation and geo-acoustic properties.

Purpose of the Study:

To derive the low-frequency and low grazing angle seabed backscattering strength (BBS) in shallow water.
To establish an equivalent relationship between complex scattering scenarios and a single range-dependent backscattering angle.
To utilize reverberation measurements for inferring seabed acoustic properties.

Main Methods:

Employed the energy flux method for shallow water reverberation analysis.
Derived closed-form expressions for reverberation in an isovelocity waveguide.
Utilized an equivalent relationship representing multimode/ray scattering by a single range-dependent angle to derive BBS.

Main Results:

Successfully derived LF & LGA BBS in the 200-2500 Hz frequency band and 1.1°-14.0° grazing angle range.
The derived BBS is based on reverberation measurements from three sandy bottom sites.
The study validates the use of reverberation inversion for characterizing seabed acoustic properties.

Conclusions:

The energy flux method and derived equivalent scattering relationship provide a viable approach for estimating LF & LGA BBS in SW.
Reverberation measurements can be effectively inverted to determine seabed acoustic parameters.
This method offers a practical solution for the otherwise difficult direct measurement of LF/LGA seabed scattering.