Image processing for the study of bedload transport of two-size spherical particles in a supercritical flow

Autor: Hergault, Virginie, Frey, Philippe, Métivier, François, Barat, Cécile, Ducottet, Christophe, Bohm, Tobias, Ancey, Christophe
Přispěvatelé: Érosion torrentielle, neige et avalanches (UR ETGR (ETNA)), Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF), UNIV PARIS 7 INST PHYS GLOBE PARIS FRA, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), UNIV ST ETIENNE LAB HUBERT CURIEN ST ETIENNE FRA, ETH LAUSANNE CHE, Dynamique des systèmes géologiques (DSG), IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Ecole Polytechnique Fédérale de Lausanne (EPFL), Institut National des Sciences de l'Univers, Cemagref, ANR-05-ECCO-0015,CEMAGREF,Morphodynamique du transport solide par charriage à différentes échelles(2005), ANR-09-RISK-0004,GESTRANS,GEStion des risques liés aux crues par une meilleure prise en compte du TRANsit Sédimentaire(2009)
Jazyk: angličtina
Rok vydání: 2010
Předmět:
Zdroj: Experiments in Fluids
Experiments in Fluids, Springer Verlag (Germany), 2010, 49 (5), pp.1095-1107
Experiments in Fluids, Springer Verlag (Germany), 2010, 49 (5), pp.1095-1107. ⟨10.1007/s00348-010-0856-6⟩
ISSN: 0723-4864
1432-1114
DOI: 10.1007/s00348-010-0856-6⟩
Popis: International audience; 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.
Databáze: OpenAIRE
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