Tracer dispersion in bedload transport
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 o...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2013-12-01
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| Series: | Advances in Geosciences |
| Online Access: | http://www.adv-geosci.net/37/1/2013/adgeo-37-1-2013.pdf |
| Summary: | 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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| ISSN: | 1680-7340 1680-7359 |