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PRODID:-//Memento EPFL//
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SUMMARY:EESS talk on "Sediment transfer in the Rhône Basin: the role of l
 ocalized Alpine severe storms on the triggering of turbidity currents in L
 ake Geneva"
DTSTART:20201117T121500
DTEND:20201117T130000
DTSTAMP:20260928T184150Z
UID:4adf99a62a18a81c9effe6d28e05b957b2fdbc2e20d6cf8429e2ea69
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr François Mettra\, scientist\, Ecological Engineering Labor
 atory\, EPFL\nAbstract:\nIn the Eastern Lake Geneva\, the sublacustrine Rh
 ône delta presents a deep canyon\, the Rhône Canyon. Former studies and 
 recent observations show that winter underflows and summer turbidity curre
 nts are frequent in the Rhône Canyon. Winter underflows are long-lasting 
 and slow\, whereas summer turbidity currents are brief and occasionally sh
 owing high velocities. In this talk\, we revisit the three different event
  types triggering turbidity currents in the Rhône Canyon in Summer: large
 -scale floods\, sublacustrine slides on the Rhône delta and high concentr
 ation sediment clouds traveling in the Rhône River due to localized sever
 e storms.\n\nAfter an introduction on the Rhône Canyon underflows and sea
 sonal characteristic of sediment export in the Rhône Basin\, the evidence
  of isolated storms leading to turbidity currents in deep Lake Geneva is s
 hown using simultaneous observations from the Rhône Canyon and the Rhône
  Basin. Then\, preliminary estimations of the frequency of turbidity curre
 nts relative to their type of triggering and their significant influence o
 n the total sediment load that ends in Lake Geneva are discussed. Finally\
 , future work on the sediment concentration estimations in the Rhône and 
 bathymetry measurements on the sublacustrine Rhône delta are briefly ment
 ioned.\n\nShort biography:\nFrançois Mettra is a scientist at the Ecologi
 cal Engineering Laboratory (ECOL)\, headed by Prof. D. Andrew Barry\, of t
 he Swiss Federal Institute of Technology Lausanne (EPFL). After studying f
 luid mechanics and environmental hydraulics\, he earned an engineering dip
 loma from the Engineering School of Hydraulics and Mechanics Grenoble\, Fr
 ance and his Masters from University of Grenoble Alps\, France. He moved t
 o Lausanne where he completed his PhD on the experimental study of bedload
  transport in steep channels at the Environmental Hydraulics Laboratory of
  EPFL. He continued his career as a weather forecaster and hydrologist in 
 the private sector and as a lecturer at the University of Lausanne where h
 is research was focused on sediment exports in small Alpine catchments. Hi
 s recent interest on the influence of high sediment load from Alpine river
 s on turbidity currents in Lake Geneva brought him to study lake circulati
 on and density currents at ECOL laboratory.
LOCATION:ZOOM
STATUS:CONFIRMED
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