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DTSTAMP:20260521T175031Z
SUMMARY:Intermittent wave breaking and turbulence
DESCRIPTION:We examine the statistical characteristics of ocean wave breaki
 ng and associated turbulent dissipation rates in a field of intermittent e
 vents. The intent is to reconcile the field measurements of surface follow
 ing drifters (SWIFTs) with numerical model results and dynamic scalings. C
 onversion of the model results to a surface-following reference frame\, al
 ong with normalizing of the model domain to match observations of whitecap
  coverage\, are essential steps. We show that convergence of statistics oc
 curs after approximately 1000 randomly spaced observations in time and spa
 ce\, relative to 3D breaking events. We further show important effects of 
 1) anisotropy in the calculation of the scalar turbulent dissipation rates
 \, 2) vertical extent of measurements with depth\, 3) obscuration of veloc
 ity measurements due to entrained bubbles. Most importantly\, the numerica
 l model confirms that high dissipation occurs preferentially with high voi
 d fractions (i.e.\, within bubble plumes).  Results are scaled with wave 
 steepness\, following the conventional  formulation for breaking strength
 .  We also examine an analogy of turbulent dissipation rates for waves in
  partial sea ice cover.\nSpeaker bio:\nJim is a Senior Principal Oceanogra
 pher in the Applied Physics Laboratory at the University of Washington in 
 the U.S. and is also an Associate Professor in the university’s Civil an
 d Environmental Engineering Department. http://apl.uw.edu/people/profile.p
 hp?last_name=Thomson&first_name=Jim\nJim’s research interests are in env
 ironmental fluid mechanics\, ocean waves\, marine renewable energy\, waves
  in polar regions and instrument development.\nA particular focus of his i
 nterest is measuring turbulence in the upper 1 m of the ocean water column
  using bespoke SWIFT drifters\, making him and his group the global leader
 s in turbulence measurements in this challenging environment. http://www.a
 pl.washington.edu/project/project.php?id=swift
URL:https://www.imperial.ac.uk/events/96798/intermittent-wave-breaking-and-
 turbulence/
DTSTART;TZID=Europe/London:20190702T130000
DTEND;TZID=Europe/London:20190702T140000
LOCATION:United Kingdom
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