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SUMMARY:Granular behavior in bedload transport using an Eulerian-Lagrangia
 n model
DTSTART:20160310T121500
DTEND:20160310T130000
DTSTAMP:20260508T041224Z
UID:51af72745aaeefebafcd9a3da4eb4b24a731c361b9a7baba3bb9a699
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Raphaël Maurin\, ALEA team\, IRSTEA\, Grenoble\nTurbulent 
 bedload transport is studied considering idealized steady uniform configur
 ations with monodisperse spherical particles. Focusing on the granular pha
 se description\, a coupled fluid-discrete element model is presented and v
 alidated with experiments. The model is used to analyze the influence of s
 lope variation on bedload transport. The latter is classically taken into 
 account as a variation of the critical Shields number resulting from the m
 odification of the gravity contribution on the granular phase. Performing 
 simulations by varying the channel inclination angle and the specific dens
 ity\, the sediment transport rate is observed to vary unexpectedly with bo
 th parameters.\nAn analysis of the continuous two-phase flow equations all
 ows us to identify the origin of the different effects observed\, and show
 s that the impact of the slope variation on the fluid flow inside the gran
 ular bed cannot be neglected. The latter is responsible for the transition
  from bedload to debris flow-like behavior and affects importantly the tra
 nsport rate at high slope and/or low specific density. A rescaling of the 
 Shields number is proposed from the equations and is shown to make all the
  data collapse onto a master curve when considering the dimensionless sedi
 ment transport rate as a function of the modified Shields number. Therefor
 e\, the latter characterizes well the slope influence on bedload transport
  and opens perspectives for a better understanding of the field observatio
 ns.
LOCATION:GC B1 10 http://plan.epfl.ch/?request_locale=fr&room=GC+B1+10&dom
 ain=places
STATUS:CONFIRMED
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