FN Archimer Export Format
PT J
TI On the influence of bed roughness on saltation in inertial regime
BT 
AF Minster, Gaspard
   Floc'h, France
   Valance, Alexandre
   Le Dantec, Nicolas
   Nicolle, Amandine
   Zerr, Benoit
AS 1:1,2;2:3;3:4;4:3;5:1,5;6:1,2;
FF 1:;2:;3:;4:;5:;6:;
C1 ENSTA‐Bretagne, Brest, France
   Lab‐STICC, CNRS, UMR 6285 Brest ,France
   Univ Brest, CNRS, Geo‐Ocean UMR 6538 Plouzané,France
   Institut de Physique de Rennes, CNRS, UMR 6251, Univ Rennes Rennes ,France
   Station Biologique de Roscoff, Laboratoire Adaptation et Diversité‐en Milieu Marin (AD2M), UMR 7144 Roscoff ,France
C2 ENSTA BRETAGNE, FRANCE
   CNRS, FRANCE
   UBO, FRANCE
   UNIV RENNES, FRANCE
   CNRS, FRANCE
SI BREST
SE UMR-LGO
UM GEO-OCEAN
IF 3.3
TC 0
UR https://archimer.ifremer.fr/doc/00873/98512/107974.pdf
LA English
DT Article
DE ;bed roughness;coarse sediment;critical Shields;inertial regime;saltation
AB 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 roughness leading to higher jumps. The initiation of the motion is shown to depend on the bed roughness as well. Power laws of the excess shear stress are proposed for jump height and length, taking into account the bed roughness. The dataset and analysis proposed in this study is a key ingredient for developing quantitative models for particle transport. 
PY 2024
PD MAR
SO Earth Surface Processes and Landforms
SN 0197-9337
PU Wiley
VL 49
IS 4
BP 1303
EP 1315
DI 10.1002/esp.5767
ID 98512
ER

EF