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Numerical modelling of the processes which govern the formation and the degradation of muddy massifs - Application to the Rance estuary and to the Sèvre Niortaise river banks

Abstract : The silting up process and the stability of muddy massifs are strongly dependent on the behaviour of clay-rich and high watercontent soils. The characteristics of such soils are complex and they evolve much. Depending on the environmental conditions, the material can be either a liquid or a solid. The modelling of the formation and of the degradation of muddy massifs has been studied by focusing both on the deposition/consolidation process and on the appearance of slope failures. A model based on the Gibson's theory wich simulates the evolution of mud deposits caused by hindered settling and by consolidation processes has been designed. it has been inserted in a model which similates the sediment transport in the Rance estuary (France). The new management of the muddy deposits has improved the way exchanges between the dilute suspension and the bottom are simulated. The distribution of suspended sediment has been modified and the mud deposits have been distributed in a new manner. A model bades on a finite element method has been designed in order to study the influence of various loading on slides. An application has been carried out on the Sèvre Niortaise (Frence). Laboratory tests and in situ measurements have been performed. Those have shown that the wetting-drying cycles play an important role in the degradation of the banks.
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Contributor : Ecole Agroparistech <>
Submitted on : Tuesday, July 21, 2009 - 8:00:00 AM
Last modification on : Friday, June 7, 2019 - 10:24:19 AM
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Jérôme Thiebot. Numerical modelling of the processes which govern the formation and the degradation of muddy massifs - Application to the Rance estuary and to the Sèvre Niortaise river banks. Sciences of the Universe [physics]. AgroParisTech, 2008. English. ⟨NNT : 08AGPT0020⟩. ⟨pastel-00003598⟩

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