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| Titel |
Dispersion of a plume of tracer particles by bedload transport |
| VerfasserIn |
Eric Lajeunesse, Olivier Devauchelle, Morgane Houssais, Grégoire Seizilles |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250074368
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| Zusammenfassung |
| Particles entrained by rivers tend to disperse as they move downstream. Understanding the mechanisms responsible for particle dispersion is therefore important to describe the transport of solid-phase contaminants in streams or the accumulation of cosmogenic radionuclides in sediment grains during transport. While the prediction of the sediment transport rate at a specific point has been the topic of a large number of investigations, particle dispersion has however received much less attention. Here, we use the erosion-deposition model proposed by Lajeunesse et al. [2010] to understand the transport of a plume of tracer particles. We restrict our analysis to the case of steady-state transport above a flat bed of uniform sediment. We show that, at equilibrium, the transport of a plume of tracer particles obeys an advection-exchange mechanism. After a transient dominated by initial conditions, the transport of the plume tends toward an advection-diffusion equation. |
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