 |
Université Jean Monnet – Saint-Etienne |  |
|
Université Jean Monnet – Saint-Etienne | |
| HAL : ujm-00489051, version 1 |
| DOI : 10.1007/s00348-010-0856-6 |
| Fiche détaillée |  Récupérer au format |
 |
| Experiments in fluids (2010) DOI 10.1007/s00348-010-0856-6 |
|
|
|
|
| Image processing for the study of bedload transport of two-size spherical particles in a supercritical flow |
|
|
| Virginie Hergault 1Philippe Frey 1 |
|
|
| (20/03/2010) |
|
|
|
| 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. |
|
|
|
|
|
|
|
|
|
|
|
| 1 : | Erosion torrentielle neige et avalanches (UR ETGR) |
|
|
|
CEMAGREF |
|
|
| 2 : | Dynamique des systèmes géologiques (DSG) |
|
|
|
CNRS : UMR7579 – IPG PARIS – Université Paris VII - Paris Diderot |
|
|
| 3 : | LAboratoire Hubert Curien (LAHC) |
|
|
|
CNRS : UMR5516 – Université Jean Monnet - Saint-Etienne |
|
|
| 4 : | Ecole Polytechnique Fédérale de Lausanne (EPFL) |
|
|
|
École Polytechnique Fédérale de Lausanne |
|
|
|
|
|
|
|
|
|
| domaine | : | Sciences de l'ingénieur/Traitement du signal et de l'image Sciences de l'ingénieur/Mécanique/Mécanique des fluides Physique/Mécanique/Mécanique des fluides Informatique/Traitement du signal et de l'image |
| ujm-00489051, version 1 | |
| http://hal-ujm.ccsd.cnrs.fr/ujm-00489051 | |
| oai:hal-ujm.ccsd.cnrs.fr:ujm-00489051 | |
| Contributeur : Christophe Ducottet | |
| Soumis le : Jeudi 3 Juin 2010, 16:58:23 | |
| Dernière modification le : Jeudi 3 Juin 2010, 16:58:23 | |
