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Mécanisme d'érosion et de déposition de l'écoulement granulaire sur un fond meuble

Abstract : Granular flows, which are common in nature and industry, have particular characteristics that are different from the ordinary flow of liquid (eg. water, oil, etc.) and are not yet well understood in the literature. This case underlines the lack of knowledge on the exchange rate between solid and liquid states of granular flows which is the origin of the erosion - deposition phenomenon and constitutes the core of this thesis. To address the issue of the exchange rate solid - liquid, this work is based mainly in two subjects. The first subject is to study the processes of erosion and deposition of a flow generated by the grains stocked in a reservoir. By releasing naturally with zero-velocity the grains to generate the granular flow, we quantified the relation between the erosion and deposition for determining the neutral angle which defines the slope where these two processes balance. The second subject is to analyze the fall of grains in Sinai step problem by studying the spread of the march. For both works, we conduct not only the experimental but also theoretical studies based on the phenomenological models of the exchange rate proposed by BCRE (Bouchaud, Cates, Ravi Prakash and Edwards) and BDG (Boutreux and de Gennes) with some modifications.
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Thi Thanh Thao Trinh. Mécanisme d'érosion et de déposition de l'écoulement granulaire sur un fond meuble. Géophysique [physics.geo-ph]. Université Rennes 1, 2017. Français. ⟨NNT : 2017REN1S093⟩. ⟨tel-01743771⟩

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