E3S Web Conf.
Volume 40, 2018River Flow 2018 - Ninth International Conference on Fluvial Hydraulics
|Number of page(s)||6|
|Section||Sediment and pollutant dynamics in rivers|
|Published online||05 September 2018|
Vertical grain size sorting in bedload transport on steep slopes with a coupled fluid-discrete element model
Université Grenoble Alpes, Irstea, UR ETNA, F-38402 St-Martin-d’Hères, France
2 Institut de Mécanique des Fluides de Toulouse, Univ. Toulouse, CNRS, 31400 Toulouse, France
3 Université. Grenoble Alpes, LEGI, G-INP, CNRS, F-38000 Grenoble, France
* Corresponding author: firstname.lastname@example.org
In order to study vertical grain size sorting in bedload sediment transport, numerical experiments of two-size particle mixtures were carried out, using a validated coupled fluid-discrete element model developed at Irstea. A 3D 10% steep domain, consisting at initial time of a given number of layers of 4 mm particles deposited on top of a coarser 6 mm particle bed, was sheared by a turbulent and supercritical fluid flow (Shields numbers of 0.1 and 0.3). The elevation of the centre of mass of the infiltrated fine particles is observed to follow the same logarithmic decrease with time, whatever the initial number of fine layers. This decrease is steeper for a higher Shields number. The main result is that this typical behaviour is related at first order to the particle shear rate depth profile.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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