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SUMMARY:Numerical Modelling of Submarine Run-out - Takaaki Kobayashi\, CUE
 D
DTSTART:20121123T141500Z
DTEND:20121123T151500Z
UID:TALK39758@talks.cam.ac.uk
CONTACT:Anama Lowday
DESCRIPTION:Submarine run-out is one of the most catastrophic natural haza
 rds which can cause severe damage to offshore infrastructure. The motion o
 f submarine run-out is best described by a non-Newtonian fluid model once 
 a block of sediment collapses to form a fully mobilised flow. The Bingham 
 fluid model is the simplest and most-widely used model for this approach. 
 The parameters involved in the model are back-calculated using the evidenc
 e of previous run-out events\, and are used for the risk assessment of fut
 ure events. However\, the parameters obtained by back calculation could va
 ry by orders of magnitude from event to event\, indicating that the simple
  fluid model is incapable of describing the entire process of submarine ru
 n-out.\nIn this study\, we propose a new method for simulating submarine r
 un-out based on the Material Point Method (MPM) and critical state soil me
 chanics. It is important that our simulations do not rely on back-calculat
 ions and can be performed using soil parameters derived from conventional 
 soil tests. The goal of this study is to develop a model that can simulate
  the entire process of submarine run-out from initiation to deposition. We
  also investigated the undrained shear strength of sea sediments to see th
 e capability of critical state concepts at a high range of water content.\
 n
LOCATION:Engineering Department - Lecture Room 6
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