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SUMMARY:Subaqueous dune dynamics : findings and perspectives
DTSTART:20260518T121500
DTEND:20260518T133000
DTSTAMP:20260526T042735Z
UID:2c2c3c7b02e26384c145d111f74d155d8f635cd94ebd3c271c65cb2a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Arnaud Doré\, Danish Hydraulic Institute (DHI)\nAbstract\
 nDunes and ripples are fascinating bedforms which have continuously attrac
 ted great attention from the scientific community since the seminal work o
 f Bagnold (1941) on wind-generated dunes in the Sahara. Findings from spac
 e agencies revealed the presence of analogous bedforms in various planetar
 y environments and comets[1]. Dunes are ubiquitous in terrestrial subaqueo
 us environments and share the same universal mechanism of generation as th
 eir extra-terrestrial and aeolian counterparts. They pose a significant ri
 sk for offshore activities in coastal areas\, especially with the growing 
 development of renewable marine energy[2]\, and for navigation along the m
 ost frequented navigational routes in European rivers[3]. The presence of 
 sand dunes leads to a significant increase of the flow resistance[4]\, whi
 ch needs to be carefully described for predicting velocities\, water level
 s and bathymetric variations in forecast models. Although sand dunes repre
 sent a great scientific and operational interest\, their evolution is stil
 l poorly understood due to their complex behaviour.\nThrough experiments\,
  numerical modeling\, and machine learning\, Arnaud has advanced understan
 ding of the physical processes that control subaqueous dune morphodynamics
 \, from near-flat beds to equilibrium states\, revealing the complex feedb
 ack mechanisms that shape non-cohesive sand beds. In this seminar\, he wil
 l discuss these results and their broader implications for predicting the 
 development and large-scale organization of dune fields. He will also shar
 e insights from his work as a coastal scientist at the Danish Hydraulic In
 stitute.\n \n[1] Jia\, P.\, Andreotti\, B. and P. Claudin\, Proceedings o
 f the National Academy of Sciences\, 114 (10)\, 2509-2514 (2017).\n\n[2] B
 arrie\, J. V.\, and K. W. Conway\, Continental Shelf Research\, 83\, 45-52
 \, (2014).\n\n[3] Vantorre\, M.\, et al.\, Fourth International Conference
  on Marine and River Dune Dynamics\, 301-308\, (2013).\n\n[4] Deigaard\,R.
 \, and J. Fredsøe\, Proceedings of the 20th Coastal Engineering Conferenc
 e\, 1047-1061\, (1987).\n\n\nBiography \nDr. Arnaud Doré is a graduate o
 f Centrale Marseille (Aix-Marseille University) and holds a PhD in Coastal
  Oceanography from the University of Bordeaux (CNRS/EPOC lab)\, awarded in
  2015. For over a decade\, he has worked as a coastal scientist and engine
 er\, primarily at the Danish Hydraulic Institute in Copenhagen. His resear
 ch focuses on nearshore and seabed morphodynamics\, employing a range of t
 ools including data analysis\, numerical modeling\, and machine learning. 
 In 2021\, Dr. Doré was awarded a Marie Skłodowska-Curie Global Fellowshi
 p for DUNAMICS\, a three-year collaborative project between the University
  of Auckland and DHI. This research investigates submarine dunes using a c
 ombination of experiments\, numerical modeling\, and high-resolution multi
 beam datasets.\n\nSandwiches will be provided before the seminar. \n\n 
LOCATION:GC C3 30 https://plan.epfl.ch/?room==GC%20C3%2030
STATUS:CONFIRMED
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