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Earth Surface Dynamics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/esurf-2020-77
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esurf-2020-77
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  07 Oct 2020

07 Oct 2020

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This preprint is currently under review for the journal ESurf.

Relevance of acoustic methods to quantify bedload transport and bedform dynamics in large sandy-gravel bed river

Jules Le Guern1, Stéphane Rodrigues1,2, Thomas Geay3, Sébastien Zanker4, Alexandre Hauet4, Pablo Tassi5,6, Nicolas Claude5,8, Philippe Jugé7, Antoine Duperray1, and Louis Vervynck1 Jules Le Guern et al.
  • 1UMR CNRS CITERES, University of Tours, France
  • 2Graduate School of Engineering Polytech Tours, University of Tours, France
  • 3BURGEAP R&D, Grenoble, France
  • 4EDF, Division Technique Générale, Grenoble, France
  • 5EDF R&D – National Laboratory for Hydraulics and Environment (LNHE), Chatou, France
  • 6Saint-Venant Laboratory for Hydraulics, Chatou, France
  • 7CETU Elmis Ingénieries, University of Tours, Chinon, France
  • 8EDF, Centre Ingénierie Hydraulique, La Motte Servolex, France

Abstract. Despite the inherent difficulties to quantify its value, bedload transport is essential to understand fluvial systems. In this study, we assessed different indirect bedload measurement techniques with a reference direct bedload measurement in a section of a large sandy-gravel bed river. Acoustic Doppler Current Profiler (aDcp), Dune Tracking Method (DTM) and hydrophone measurement techniques were used to determine bedload transport rates using calibration with the reference method or using empirical formula. Results show that the hydrophone is the most efficient and accurate method to determine bedload flux in the Loire River. Even though parameters controlling self-generated noise of sediments still need to better understood, the calibration determined in this study allows a good approximation of bedload transport rates. Moreover, aDcp and hydrophone measurement techniques are both able to continuously measure bedload transport associated to bedform migration.

Jules Le Guern et al.

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Jules Le Guern et al.

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Short summary
Despite the inherent difficulties to quantify its value, sediment transport is essential to understand fluvial systems. This study try to improve the measurement by comparing several methods. Acoustic methods are compared to direct measurements with samplers. The hydrophone is well adapted to quantify sediment transport in mountain streams but this study shows the potential and the efficiency of this device in large lowland rivers.
Despite the inherent difficulties to quantify its value, sediment transport is essential to...
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