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SUMMARY:Pollutant mixing and dispersion:  Turbulent Entrainment and Mixing
  in Turbulent Environments
DTSTART:20140218T161500
DTEND:20140218T171500
DTSTAMP:20260601T073041Z
UID:36aa47b1e5866f92cc93edaef8ef631ed59a80d2c8c9883af519a474
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Susan Gaskin\, Civil Engineering and Applied Mechanics\, Mc
  Gill University\, CA - visiting professor to CRYOS\nAbstract:\nInland sur
 face waters (rivers\, lakes) have long been used for the disposal and tran
 sportation of waste products resulting from human activities with the ocea
 n as the ultimate receiving body due to its assimilative capacity for larg
 e quantities of biodegradable pollutants\, although conservative pollutant
 s are also disposed of therein.  The increasingly detrimental effects of 
 these pollutants on the environment have prompted more stringent regulatio
 ns.  Together these motivate the study of environmental hydraulics with i
 ts concern for the disposal of and accidental spills of effluents as point
  releases to the atmosphere (via smoke stacks) and to surface water bodies
  (via outfalls)\, and its goal of predicting the effluent’s subsequent t
 ransport and dispersion at the local or regional scale (up to 100 km).  A
 n understanding of turbulent mixing and entrainment is crucial because the
  higher the initial dilution of the pollutants\, the lower the impact on t
 he environment.  A remarkable property of turbulence is its capacity to m
 ix either a vector (effluent velocity) or a scalar (pollutant) extremely r
 apidly and hence dilute it.  Turbulent jets are effective pollutant disch
 arge mechanisms in the near field with effluent dilution occurring due to 
 the momentum or buoyancy driven turbulent entrainment into the turbulent j
 et. Effluents are released as turbulent flows into a receiving fluid (lake
 \, river\, ocean) having a range of turbulence levels.  A prevailing assu
 mption is that background turbulence will increase near field dilution due
  to the superposition of jet dilution and turbulent diffusion.  The entra
 inment and mixing mechanisms of turbulent jets in quiescent ambients is re
 viewed.  Theoretical arguments and experimental studies on the effect of 
 turbulence in the ambient on jet dilution are shown (both a plane jet in a
  coflow and an axisymmetric jet in no flow).  These studies contradict th
 e prevailing assumption and indicate that near field dilution is reduced i
 n the presence of ambient turbulence.Short biography:\nSusan Gaskin’s ar
 eas of research are in environmental hydraulics and water resources.  She
  is an Associate Professor in the Department of Civil Engineering at McGil
 l University\, Canada\, which she joined in 1997. Her interests in environ
 mental hydraulics are in the prediction of pollutant mixing and dispersion
  in surface waters using experimental methods to study the turbulent mixin
 g processes\, in sediment transport and in applied hydraulics.  In water 
 resources management\, her research studies both technical and management 
 aspects of sustainable water supply management in a large project in Camer
 oon and on basin wide hydrologic modeling in the Basin of Mexico. She teac
 hes courses in open channel flow\, hydraulics\, river engineering and wate
 r sustainability.
LOCATION:GR A3 32 http://plan.epfl.ch/?room=GR%20A3%2032
STATUS:CONFIRMED
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