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SUMMARY:Transport and Settling of Sediments in River Plumes - Bruce Suther
 land\, Depts. Physics / Earth & Atmospheric Sciences\, University of Alber
 ta
DTSTART:20180315T113000Z
DTEND:20180315T123000Z
UID:TALK97594@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Through laboratory experiments\, the transport\, settling and 
 resuspension of sediments in the ocean are examined.   Salt water is shown
  to enhance flocculation of clay and hence increase their settling rate.  
  In studies modelling river plumes\, the transport down a slope of particl
 es from hyperpycnal currents (also known as turbidity currents or\, more c
 ommonly\, as underwater avalanches) is shown to separate from the bottom i
 n a stratified fluid\, whose density increases with depth due to decreasin
 g temperature and/or increasing salinity.  Even for hypopycnal currents (w
 hose particle density is so small that they advance over the ocean surface
 )\, experiments show that the particles that eventually settle through uni
 form-density fluid toward a sloping bottom form a turbidity current.   Som
 e of the particles from this current eventually rise again.   Particle-set
 tling from a hypopycnal current passing over a stratified fluid is further
  complicated by internal waves created in response to the advancing curren
 t.  After finally settling\, shoaling internal solitary waves can resuspen
 d particles and carry them back up upslope.   All these results suggest th
 at the dynamics of interfacial internal waves and of gravity currents in s
 tratified fluid play an important role in the ultimate deposition of parti
 cles.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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