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Advances in Geosciences An open-access journal for refereed proceedings and special publications
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Volume 37 | Copyright
Adv. Geosci., 37, 1-6, 2013
https://doi.org/10.5194/adgeo-37-1-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

  17 Dec 2013

17 Dec 2013

Tracer dispersion in bedload transport

E. Lajeunesse, O. Devauchelle, M. Houssais, and G. Seizilles E. Lajeunesse et al.
  • Institut de Physique du Globe – Sorbonne Paris Cité, Équipe de Dynamique des fluides géologiques, 1 rue Jussieu, 75238 Paris cedex 05, France

Abstract. Bedload particles entrained by rivers tends to disperse as they move downstream. In this paper, we use the erosion-deposition model of Charru et al. (2004) to describe the velocity and the spreading of a plume of tracer particles. We restrict our analysis to steady-state transport above a flat bed of uniform sediment. The transport of tracer particles is then controlled by downstream advection and particle exchange with the immobile bed. After a transitional regime dominated by initial conditions, the evolution of a plume of markers tends asymptotically towards classical advection-diffusion: its average position grows linearly with time, whereas it spreads like the square root of time.

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