Journal cover Journal topic
Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2017-171
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
22 May 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Hydrology and Earth System Sciences (HESS) and is expected to appear here in due course.
Passive Acoustic Measurement of Bedload Grain Size Distribution using the Self-Generated Noise
Teodor I. Petrut1,2, Thomas Geay1, Cédric Gervaise4,5, Philippe Belleudy2, and Sebastien Zanker3 1Université Grenoble Alpes, Grenoble INP, CNRS, GIPSA - Lab, Grenoble, France
2Université Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, Grenoble, France
3Électricité de France, DTG division, Grenoble, 38040, France
4Institut de recherche CHORUS, Phelma Ca mpus, 3 Parvis Néel , 38000 Grenoble, France
5Chaire de recherche CHORUS, Fondation partenariale Grenoble INP, 46 avenue Felix Viallet, 38000, Grenoble, France
Abstract. Monitoring sediment transport processes in rivers is of particular interest to engineers and scientists to assess the stability of rivers and hydraulic structures. Various methods for sediment transport processes description were proposed using conventional or surrogate measurement techniques. This paper addresses the topic of the passive acoustic monitoring of bedload transport in rivers and especially the estimation of the bedload grain size distribution from self-generated noise. It discusses the feasibility of linking the acoustic signal spectrum shape to bedload-grain sizes involved in elastic impacts with the bed river treated as a massive slab. Bedload grain size distribution is estimated by a regularized algebraic inversion scheme fed with the power spectrum density of river noise estimated from one hydrophone. The inversion methodology relies upon a physical model which predicts the acoustic field generated by the collision between rigid bodies. Here it is proposed an analytic model of the acoustic power spectrum generated by the impacts between a sphere and a slab. The proposed model is written as linear system of analytic power spectra weighted by the grain size distribution. The algebraic system of equations is then solved by least square optimization and solution regularization methods. The result of inversion leads directly to the estimation of the bedload grain size distribution. The inversion method was applied on real acoustic data from passive acoustics experiments realized on the Isère River, in France. The inversion of in situ measured spectra reveals good estimations of grain size distribution, fairly close to what was estimated by physical sampling instruments. These results illustrate the potential of the hydrophone technique to be used as a standalone method that could ensures high spatial and temporal resolution measurements for sediment transport in rivers.

Citation: Petrut, T. I., Geay, T., Gervaise, C., Belleudy, P., and Zanker, S.: Passive Acoustic Measurement of Bedload Grain Size Distribution using the Self-Generated Noise, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2017-171, in review, 2017.
Teodor I. Petrut et al.
Teodor I. Petrut et al.
Teodor I. Petrut et al.

Viewed

Total article views: 566 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
471 77 18 566 11 24

Views and downloads (calculated since 22 May 2017)

Cumulative views and downloads (calculated since 22 May 2017)

Viewed (geographical distribution)

Total article views: 566 (including HTML, PDF, and XML)

Thereof 560 with geography defined and 6 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 12 Dec 2017
Publications Copernicus
Download
Short summary
Our interest is focused on developing the hydrophone technique to describe the size of particles transported by the river flow. The analytic solution from the acoustic equation wave describing the impact between particles is used to model the power spectrum of a sediment mixture, which is broad grain size distribution. Estimations of the grain size distributions by inverting real spectra measured on the Isère River are successfully validated by the physical sampling of the bedload transport.
Our interest is focused on developing the hydrophone technique to describe the size of particles...
Share