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Bed-load particle motion in supercritical open channel flows

  • Supercritical sediment-laden open channel flows occur in many hydraulic structures including dam outlets, weirs, and bypass tunnels. Due to high flow velocities and sediment flux severe problems such as erosion and abrasion damages are expected in these structures (Jacobs et al., 2001). Sediment bypass tunnels (SBT), as an effective measure to decrease reservoir sedimentation by bypassing sediments during floods, are exceptionally prone to high abrasion causing significant annual maintenance cost (Sumi et al., 2004; Auel and Boes, 2011). The Laboratory of Hydraulics, Hydrology and Glaciology (VAW) of ETH Zurich conducted a laboratory study to counteract these negative effects (Auel, 2014). The main goals of the project were to analyze the fundamental physical processes in supercritical flows as present in SBTs by investigating the mean and turbulence flow characteristics (Auel et al., 2014a), particle motion (Auel et al., 2014b; 2015b), and abrasion development caused by transported sediment. Besides new insights into the three listed topics, paramount interest is given to their inter-relations and the development of an easily applicable abrasion prediction model (Auel et al., 2015a). This paper presents selected results on the second topic, i.e. the analysis of saltation trajectories of single coarse particles in supercritical flow.

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Metadaten
Author:C. Auel, I. Albayrak, R.M. Boes
URN:urn:nbn:de:hbz:836-opus-151559
DOI:https://doi.org/10.25974/fhms-15155
Parent Title (German):Proc. 36th IAHR World Congress, Delft - The Hague, the Netherlands
Publisher:IAHR
Document Type:Article in Conference Proceedings
Language:English
Date of Publication (online):2022/08/22
Year of first Publication:2015
Publishing Institution:FH Münster - University of Applied Sciences
Release Date:2022/09/02
Institutes:Bauingenieurwesen (BAU)
Publication list:Auel, Christian
Licence (German):License Logo Zweitveroeffentlichung