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SUMMARY:Nonlinear surface waves at finite depth with and without surface c
 over - John Grue (University of Oslo)
DTSTART:20170808T080000Z
DTEND:20170808T090000Z
UID:TALK74871@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Results of recent and ongoing sets of experiments on nonlinear
  surface waves at finite depth are presented. We are particularly investig
 ating the properties of the maximum elevation and wave-induced velocity as
  well as particle drift. While waves without a cover are realistic for oce
 an surface waves\, the effect of a cover is important for waves interactin
 g with an ice sheet. Experiments are connected to available measurements a
 t moderately shallow reefs or shallow seas where in the latter case wind-d
 riven waves are observed\, obtaining a strong limiting effect by wave brea
 king\, on the amplitude. The vertically integrated particle drift is zero.
  The particle drift is strongly enhanced below the wave surface and above 
 the bottom\, due to the streaming effects\, where also the shear is enhanc
 ed\, with implications to a magnified Stokes drift. The particle drift vel
 ocity is zero at two vertical positions. Below a cover (ice) the drift she
 ar becomes negative. The investigations are motivated by requests from the
  offshore wind industry as well as Polar research.
LOCATION:Seminar Room 1\, Newton Institute
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