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| Hermidas, Navid; Silva Jacinto, Ricardo; Eggenhuisen, Joris T.; Luthi, Stefan M.. |
| A new viscoelastic constitutive model for subaqueous clay-rich gravity flows is presented. It is explained that for the materials which exhibit a minimum in their strain controlled flow curves the structure parameter must be a symmetric function of strain rate and stress. Therefore, the destruction of structure within the material is modeled using the dissipation energy. An expression for the elastic strain of the flowing structure is derived. The final set of equations can reproduce the viscosity bifurcation that clay suspensions may exhibit under a given load. This is explained to be important for prediction of the run-out distance of clay-rich gravity flows. The ability of the model to reproduce the general response of pasty materials to step stress and... |
| Tipo: Text |
Palavras-chave: Gravity flow; Thixotropy; Clay suspension; Viscosity bifurcation. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00483/59497/62365.pdf |
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| Hugot, Alexandre; Joseph, Philippe; Savoye, Bruno; Zaleski, Stéphane. |
| We propose to apply in this note a simple mathematical model for the sedimentation of gravity deposits in deep water. An inverse method has been developed in order to characterize the parameters associated with the submarine flow. This method also provides the initial conditions, which constitute a major uncertainty in geoscience modelling. Application of the inverse method to the 1979 Nice air-port collapse (southern France), constrained by cable breaks and/or deposit thicknesses, leads, for example, to the estimation of the initial volume and/or the physical parameters of the flow (friction coefficient, modified turbulent Schmidt number, etc.). The application of the model to this real case shows that only the simultaneous inversion of dynamic (cable... |
| Tipo: Text |
Palavras-chave: France; 1979 Nice airport collapse; Inverse problem; Flow object; Turbidity current; Gravity flow. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/publication-787.pdf |
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