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SUMMARY:Debris flow analogue models: how far can we push them? - Lis Bowma
 n (University of Sheffield)
DTSTART:20170206T130000Z
DTEND:20170206T140000Z
UID:TALK70500@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:Debris flows (rapidly moving landslides consisting of saturate
 d mixtures of soil\, rocks and water) exist in nature as a particularly ha
 zardous type of granular flow. Their motion involves complex interactions 
 between particles and fluid that segregate in time and space. In order to 
 better understand the modes of deformation of debris flows\, we have carri
 ed out experiments that cover the physical extremes of behaviour. These in
 volve\, on the one hand\, experiments on monodisperse particles under dry 
 steady flow and on the other\, fluid saturated physical models of unsteady
  debris flows that consist of particles of different size and shape. For t
 he former experiments\, we take measurements at the flow margins using Par
 ticle Image Velocimetry (PIV) and Particle Tracking Velocimetry (PTV) to e
 nable flow profiles and granular temperature to be determined. For the lat
 ter\, visual access to the internal processes is obtained by using “tran
 sparent soil”\, Plane Laser Induced Fluorescence and PIV / PTV. The resu
 lts provide insights as to the mechanisms that are of most importance to d
 ebris flow development and show that oversimplification may result in mode
 ls that no longer reflect the prototype intended. \n\n
LOCATION:MR5\, Centre for Mathematical Sciences
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