Skip to Main content Skip to Navigation
Journal articles

Acoustic Backscatter and Attenuation Due to River Fine Sediments: Experimental Evaluation of Models and Inversion Methods

Adrien Vergne 1 Céline Berni 1, * Jérôme Le Coz 1 Florent Tence 1, 2 
* Corresponding author
2 STRATO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : The hydroacoustic monitoring of suspended sediment concentration (SSC) in rivers is based on the inversion of backscatter and attenuation models. To evaluate such models, acoustic backscatter and attenuation were measured from a homogeneous suspension of fine river sediments (clay) in a laboratory tank at various concentrations in the range 1–18 g/l. Agreement between the modeled and measured acoustic backscatter and attenuation values was found to be relatively poor. The results are highly sensitive to particle size and shape which come with large measurement uncertainties and they can be significantly improved by adjusting plausible particle parameters. Various inversion methods combining single or multiple frequencies, analysis of backscatter and/or attenuation, spherical or oblate shape hypothesis for particles and fixed or estimated lognormal grain size distribution are tested. The most promising inversion methods using both backscatter and attenuation information led to accurate SSC estimates.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03340615
Contributor : Catherine Cardon Connect in order to contact the contributor
Submitted on : Thursday, June 23, 2022 - 10:12:53 AM
Last modification on : Friday, June 24, 2022 - 3:55:52 AM

File

Water Resources Research - 202...
Publisher files allowed on an open archive

Licence

Copyright

Identifiers

Citation

Adrien Vergne, Céline Berni, Jérôme Le Coz, Florent Tence. Acoustic Backscatter and Attenuation Due to River Fine Sediments: Experimental Evaluation of Models and Inversion Methods. Water Resources Research, American Geophysical Union, 2021, 57 (9), pp.e2021WR029589. ⟨10.1029/2021WR029589⟩. ⟨insu-03340615⟩

Share

Metrics

Record views

0

Files downloads

0