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SUMMARY:Submarine sediment density flows and their impact on subsea infras
 tructure: How far\, how fast\, how dense?
DTSTART:20151113T121500
DTEND:20151113T131500
DTSTAMP:20260510T084137Z
UID:1d4bde448de600a86ce907aa9e636a237bc9b9eac70ad602d85b5b64
CATEGORIES:Conferences - Seminars
DESCRIPTION:Benoit Spinewine. Senior Engineer\, Team Leader Seabed Mobilit
 y at Fugro GeoConsulting and Guest Lecturer at Université catholique de L
 ouvain\, Belgium\nWith the gradual depletion of nearshore resources and te
 chnological advances in oil and gas production\, developments are now ofte
 n located further offshore beyond the continental shelf\, in environments 
 of steeper slopes susceptible to mass movement events. The presentation hi
 ghlights the motivation behind the development of numerical models capable
  of simulating the dynamic evolution of submarine sediment density flow ev
 ents from inception to runout\, and the implications of the flow dynamics 
 in terms of the level of risk imposed on subsea infrastructure upon impact
 . At first\, the presentation highlights the types of submarine sediment d
 ensity flows of engineering significance\, and discusses some of the key q
 uestions that remain to be addressed by further research. It then introduc
 es two depth-averaged\, two-dimensional models for debris flow runout that
  rely on radically different solution methods (Smoothed Particle Hydrodyna
 mics and the Finite Volume Method). The models can both utilize non-linear
  rheological soil models\, and have the capability to include mechanisms f
 or strength degradation resulting either from strain accumulation or the e
 ntrainment of ambient fluid. The two models are cross-validated on an hypo
 thetical test case\, and then used to illustrate the effect that soil rheo
 logy may have on the flow conditions at the point of impact against a pipe
 line. It highlights the crucial role of flow viscosity\, and more generall
 y\, the importance of a proper rheological characterization for the purpos
 e of impact analyses. It also discusses modelling of the dynamic structura
 l response of a pipeline to flow impact\, using the finite element suite S
 age Profile 3.0. The presentation then discusses ongoing developments aime
 d at proposing a unified framework for debris flow/turbidity current model
 ling using a two-layer approach.\nBio : Benoit Spinewine obtained his PhD 
 in Civil Engineering from the University of Louvain-la-Neuve\, Belgium\, o
 n dam-break induced sediment transport. He then spent two years at the Uni
 versity of Illinois working on submarine turbidity currents. He has tackle
 d the related challenges by combining experimental investigations\, specia
 lized numerical techniques\, and field applications. He has over 10 years
 ’ experience in applied and fundamental research\, has authored 18 journ
 al publications and over 50 communications at specialty conferences and co
 ngresses. While maintaining a guest-lectureship at University of Louvain-l
 a-Neuve on coastal & maritime hydraulics and computational methods\, he is
  now mainly applying his expertise on offshore industry projects at Fugro 
 GeoConsulting.
LOCATION:GC C3 30 http://plan.epfl.ch/?lang=fr&room=GCC330
STATUS:CONFIRMED
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