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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Transition from the saltation mode of bed load transport to the rolling mode
 Lukerchenko, Nikolay ; Ivanova, Irina ; Chára, Zdeněk ; Vlasák, Pavel
The paper deals with the sediment transport of sand particles conveyed by water in an open channel. A 3D numerical model developed by the authors was used for simulation of the sand particles movement in the channel with rough bed. Similarly to Shields theory of sediment transport incipient motion of the bed load particles the shear stress for the transition process from saltation mode to rolling mode can be defined. The shear stress value can be determined as a function of two dimensionless parameters, particle parameter and equivalent bed roughness. The particle parameter is a function of the particle size and density, and the carrier liquid density and viscosity. The presented numerical solution reveals that the shear stress for the transition process from saltation mode to rolling mode is less than the shear stress for the incipient sediment motion and depends on channel bed roughness.
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3D numerický model saltace kolize elipsoidální částice s drsným dnem
 Lukerchenko, Nikolay ; Piatsevich, Siarhei ; Chára, Zdeněk ; Vlasák, Pavel
The paper deals with 3D numerical model of an ellipsoidal particle collision with rough bed. The dependences of values of the particle translational and angular velocities immediately after the collision on the values immediately before the collision are obtained for two collision patterns: impact with slip and impact without slip.
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