Image processing for the study of bedload transport of two-size spherical particles in a supercritical flow |
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Authors: | Virginie Hergault Philippe Frey François Métivier Cécile Barat Christophe Ducottet Tobias Böhm Christophe Ancey |
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Institution: | 1. Cemagref, Unité de recherche Erosion torrentielle Neige et Avalanches, Domaine Universitaire-BP 76, 38402, St-Martin-d’Hères, France 2. Laboratoire de dynamique des fluides géologiques IPGP/ParisVII UMR CNRS 7579, Institut de Physique du Globe de Paris, Paris, France 3. Université de Lyon, CNRS, UMR5516, Laboratoire Hubert Curien, Université de Saint-Etienne, Jean Monnet, 42000, Saint-Etienne, France 4. Ecole Polytechnique Fédérale de Lausanne, 1015, Ecublens, Lausanne, Switzerland
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Abstract: | Bedload sediment transport of two-size coarse spherical particle mixtures in a turbulent supercritical flow was analyzed with
image and particle tracking velocimetry algorithms in a two-dimensional flume. The image processing procedure is entirely
presented. Experimental results, including the size, the position, the trajectory, the state of movement (rest, rolling, and
saltation), and the neighborhood configuration of each bead, were compared with a previous one-size experiment. Analysis of
the solid discharge along the vertical displayed only one peak of rolling in the two-size bed, whereas three peaks of rolling
appeared in the one-size case due to a larger collective motion. The same contrast is evidenced in spatio-temporal diagrams
where the two-size mixtures are characterized by the predominance of saltation and a smaller number of transitions between
rest and rolling. The segregation of fine particles in a bed formed by larger particles was analyzed taking into account the
neighborhood configurations. |
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