On the influence of bed roughness on saltation in inertial regime - Université de Bretagne Occidentale Access content directly
Journal Articles Earth Surface Processes and Landforms Year : 2024

On the influence of bed roughness on saltation in inertial regime

Abstract

In extreme tidal environment, occurrences of saltating pebbles have been observed. The ambition to instal hydrokinetic turbines in such environment requires knowledge on the presence of pebbles in saltation in the water column because they can damage the structures. An experimental study is realized in a free-surface flume with no slope and different bed roughnesses as in marine environment. With fast camera the trajectories of hundreds of spherical particles are analysed. Our study deals with saltation in the inertial regime (i.e., large Stokes number) over fixed beds with various roughnesses. In inertial regime, the bed roughness has more influence on the collision process and the trajectory of the particles than for non-inertial motion where viscous forces play a key role. Jump height and length increase with bed roughness, with height increasing quicker than length leading to a more vertical trajectory for higher bed roughness. The vertical restitution coefficient is shown to increase with bed
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hal-04419645 , version 1 (26-01-2024)

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Gaspard Minster, France Floc'H, Alexandre Valance, Nicolas Le Dantec, Amandine Nicolle, et al.. On the influence of bed roughness on saltation in inertial regime. Earth Surface Processes and Landforms, 2024, 49 (4), pp.1303-1315. ⟨10.1002/esp.5767⟩. ⟨hal-04419645⟩
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