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SUMMARY:Granular segregation in nature - Nathalie Vriend (DAMTP)
DTSTART:20141013T120000Z
DTEND:20141013T130000Z
UID:TALK55095@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:In this talk\, I will present very recent (April 2014) geophys
 ical measurements on the structure of a desert dune. Using Ground Penetrat
 ing Radar and sand pit analysis\, we image the internal structure of a sma
 ll (h = 5 m) mobile dune. The layering displays a regular fine pattern of 
 cross-bedding\, resulting from diurnal variations or segregation during av
 alanches on the slipface. Furthermore\, a pattern of thicker\, more humid\
 , "organic layers" are apparent at irregular intervals and are most likely
  related to large rainfall events. I will continue with some results from 
 laboratory experiments on avalanches that highlight and clarify the segreg
 ation phenomena we observe in nature.
LOCATION:MR5\, Centre for Mathematical Sciences
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