BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Assessing the capacity of turbulent flows to conduct geomorphic wo
 rk
DTSTART:20170505T121500
DTEND:20170505T131500
DTSTAMP:20260916T042511Z
UID:b8c2579f986e0bcaefeace74ff4804b3eeb6306b0ebecf24db3d99c2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Dr Manousos Valyrakis\, Lecturer in Water Engineering\, 
 School of Engineering\, University of Glasgow\, U.K.\nThe primary focus of
  this research is to investigate the potential of a recently proposed crit
 erion for the precise identification of the hydrodynamic conditions respon
 sible for the onset of entrainment of coarse grains. Knowledge of such nea
 r critical flow conditions is important for a variety of applications rang
 ing from environmental hydraulics (such as protection of hydraulic structu
 res from scour) to stream ecology\, with regard to the assessment of the e
 cologically and environmentally sound flow conditions for the protection o
 f stream habitat. Recently introduced theoretical concepts as well as prob
 abilistic modeling approaches are presented. At near incipient flow condit
 ions the magnitude of energetic flow events follows a power law distributi
 on\, over a wide range of frequencies\, similar to many other geophysical 
 phenomena. This implies that highly energetic flow structures\, which have
  a good potential of impinging on an exposed particle and displacing it do
 wnstream\, occur less frequently for the same low mobility flow conditions
 . This is in agreement with the intermittent and episodic character of pa
 rticle entrainment observed from mobile particle flume experiments at low 
 mobility flows. However\, small changes in the mean flow or bed shear str
 esses may result in significant changes in the distribution of these flow 
 structures. Further\, analysis of synchronous time series of particle entr
 ainment and local instantaneous flow upstream of it\, allows for extractio
 n and characterization of the scales and magnitudes that are relevant to t
 he displacement of individual particles. In addition to having a sound the
 oretical basis\, the stochastic modeling approach is shown to perform well
  in defining the condition of incipient motion and more generally the vari
 ous levels of probability for particle entrainment. \nBio : Dr. Manousos 
 Valyrakis is a Lecturer in Water Engineering\, within the School of Engine
 ering at the University of Glasgow. Before joining the University of Glasg
 ow\, he worked at Virginia Tech and VCCER as a Research Associate\, where 
 he further researched the environmental impacts and associated risks from 
 the resource extraction industries. He gained a PhD in Environmental Hydr
 aulics from the Department of Civil Engineering at Virginia Tech\, funded 
 by NSF\, in 2011. He has a Diploma (5 year degree) in Civil Engineering\, 
 with distinctions and an MSc (Civil and Environmental Engineering)\, from
  Aristotle University of Thessaloniki. \n \nDr. Valyrakis has about 15 y
 ears of experience in environmental hydraulics and experimental/computatio
 nal fluid mechanics. He is the recipient of several awards and has served 
 as session chair on several international conferences. He has also served
  as a reviewer and member of the editorial board for a book and many inter
 national journals and conferences. He has been invited to present his rese
 arch on several venues and he has authored or co-authored more than 40 ou
 tputs\, including many peer reviewed journal papers and 2 invited book cha
 pters.\n \nHe is the manager of the Water Engineering Laboratory (Rankine
  Building) where he is currently leading research activities relevant to e
 xperimental flow dynamics and eco-hydraulics.
LOCATION:CE1103 http://plan.epfl.ch/?lang=fr&room=CE1103
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR