Utilizing High-Frequency Acoustic Backscatter to Estimate Bottom Sand Ripple Parameters

In some applications of underwater acoustics, it is important to know the ripple structure on shallow-water sediments. For example, the prediction of buried target detection via sound scattering by ripples depends critically on the ripple height and spatial wavelength. Another example is the study o...

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Bibliographic Details
Published in:IEEE journal of oceanic engineering 2009-10, Vol.34 (4), p.431-443
Main Authors: Dajun Tang, Williams, K.L., Thorsos, E.I.
Format: Article
Language:English
Subjects:
Acoustic scattering
Acoustics
Backscatter
Backscattering
Computer simulation
Inversions
Marine
Mathematical models
Numerical models
Numerical simulation
Object detection
Power system modeling
Remote sensing
Ripples
Sand
sediment
Sediment transport
Sediments
Time domain analysis
Underwater acoustics
Wavelength measurement
Wavelengths
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Summary:In some applications of underwater acoustics, it is important to know the ripple structure on shallow-water sediments. For example, the prediction of buried target detection via sound scattering by ripples depends critically on the ripple height and spatial wavelength. Another example is the study of sediment transport, where knowing the ripple structure and its evolution over time helps to understand the forcing on the bottom and the response of sediments. Here, backscatter data from a 300-kHz system are used to show that ripple wavelength and height can be estimated from backscatter images via a simple inversion formula. The inversion results are consistent with in situ measurements of the ripple field using an independent measurement system. Motivated by the backscatter data, we have developed a time-domain numerical model to simulate scattering of high-frequency sound by a ripple field. This model treats small-scale scatterers as Lambertian scatterers distributed randomly on the large-scale ripple field. Numerical simulations are conducted to investigate the conditions under which remote sensing of bottom ripple heights, wavelength, and its power spectrum is possible.
ISSN:0364-9059
1558-1691
DOI:10.1109/JOE.2009.2015402