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SUMMARY:Granular segregation in dunes and avalanches - Nathalie Vriend (Un
 iversity of Cambridge)
DTSTART:20160421T103000Z
DTEND:20160421T113000Z
UID:TALK65177@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:In this talk\, I will explore granular segregation which plays
  a critical role in avalanche dynamics and dune building. Segregation is t
 he separation of grains with different properties -- such as density or si
 ze -- due to a variety of physical processes. Segregation not only occurs 
 within avalanches in nature\, but can also be observed in the kitchen in a
  cereal box where large particle rise to the top. This natural separation 
 creates pattern formation at the grain scale which influence large-scale p
 henomena dramatically.  \n\n I will illustrate my research with data from 
 a variety of laboratory experiments and two recent desert field campaigns 
 in Qatar. I will also highlight some very recent laboratory work in which 
 we investigate granular segregation using photoelasticity for the first ti
 me. My presentation includes three central messages: (1) we are able to re
 produce and investigate key physical characteristics of avalanches in the 
 laboratory\, (2) the particle segregation results in strong layering in av
 alanches and (3) the internal structure of desert dunes features remarkabl
 e patterns and segregation\, which we can visualize in unprecedented detai
 l with geophysical techniques. \n\n
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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