We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Acoustic Backscatter and Attenuation Due to River Fine Sediments: Experimental Evaluation of Models and Inversion Methods.
- Authors
Vergne, Adrien; Berni, Céline; Le Coz, Jérôme; Tencé, Florent
- 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. Key Points: Acoustic backscatter and attenuation of a homogeneous suspension of fine river sediment were measured in a laboratory tankThe results of existing models are highly sensitive to particle size distribution uncertaintyInversion using both backscatter and attenuation yielded accurate concentration estimates
- Subjects
RIVER sediments; ATTENUATION (Physics); PARTICLE size distribution; SUSPENDED sediments; CLAY
- Publication
Water Resources Research, 2021, Vol 57, Issue 9, p1
- ISSN
0043-1397
- Publication type
Article
- DOI
10.1029/2021WR029589