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Motion and interaction of a set of particles in a supercritical flow

Abstract : Bed load transport in watercourses is a longstanding problem in the mechanics of two-phase flows because the physical processes involved are poorly known or overly complicated. The motion of coarse, spherical glass beads entrained by a shallow turbulent water flow down a steep two-dimen\-sional channel with a mobile bed was experimentally investigated. The study focused on bed load equilibrium flows, that is, neither erosion nor deposition of particles over sufficiently long time intervals occurred. Flows were filmed from the side using a high-speed camera. Image-processing software made it possible to determine the flow characteristics such as particle trajectories, their state of motion (rest, rolling, or saltating motion), and flow depth. The first striking result of our experiments was that, over short time periods, bed load transport appeared as a very intermittent process. The large solid-discharge fluctuations resulted essentially from arrangement in the mobile particle bed. Whereas for moderate slopes particles were mainly transported in saltation, the rolling regime was dominant for steep slopes.
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https://tel.archives-ouvertes.fr/tel-00009528
Contributor : Tobias Boehm <>
Submitted on : Tuesday, June 28, 2005 - 2:20:20 PM
Last modification on : Friday, November 6, 2020 - 4:02:59 AM
Long-term archiving on: : Friday, September 14, 2012 - 1:25:39 PM

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  • HAL Id : tel-00009528, version 1

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Tobias Boehm. Motion and interaction of a set of particles in a supercritical flow. Mechanics [physics.med-ph]. Université Joseph-Fourier - Grenoble I, 2005. English. ⟨tel-00009528⟩

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