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Modelisation des ecoulements gravitaires catastrophiques par une approche objet dynamique : Erosion - Transport - Depot

Abstract : In this thesis, we present a simple mathematical model for the sedimentation of deep water gravity deposits. The flow is treated as a deformable geometrical object. Main physical features of the model include : 1. Turbulence; 2. Spreading due to pressure forces; 3. Water incorporation at the suspension-ambient fluid interface; 4. Particle settling; 5. Particle erosion. Asymptotic analytical solutions of the non-linear differential system show the consistency of long times numerical solutions. Numerical tests allows the quantification of the impact of physical parameters, initial conditions and controling parameters (slope, granulometry). An inverse method is develop in order identify initial conditions and/or model parameters. Partial inversion (initial conditions identification) apply to small-scaled models, shows the good qualitative behaviour of the model, even out of his validitiy range. Total inversion (physical parameters and initial conditions identification) shows the good quantitative behaviour of the model on velocities and deposit thicknesses. Application of the inverse method to the Nice 1979 gravity flow (south-France), constrain by cable breaks and/or deposit thicknesses, leads, for example, to initial volume estimation or flow physical parameters (friction coefficient, modified turbulent Schmidt number ...). Despite some limitations, due to the geometrical simplification of the flow, this complete model constitutes a first step towards quantitative comprehension of the impact of external parameters on catastrophic gravity flow dynamics and on the organization of subsequent deposits. Due to its very short computational times, it is foreseeable to simulate series of events and therefore to form multi-event depositional sequences. It can be used to reconstruct the sedimentation processes and the resulting architecture of deep-water reservoirs.
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Contributor : Alexandre Hugot Connect in order to contact the contributor
Submitted on : Thursday, April 3, 2003 - 10:06:19 AM
Last modification on : Wednesday, December 9, 2020 - 3:13:22 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:08:17 PM


  • HAL Id : tel-00002677, version 1


Alexandre Hugot. Modelisation des ecoulements gravitaires catastrophiques par une approche objet dynamique : Erosion - Transport - Depot. Modélisation et simulation. Université Pierre et Marie Curie - Paris VI, 2000. Français. ⟨tel-00002677⟩



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