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This paper presents a global approach of the distribution of the cohesive sediments in the estuary of the river Loire in terms of the velocity of the solid phase. The study covers the large range of concentrations observed in situ. It deals with the settling velocity of suspended matter, the hindered settling velocity of intermediate concentration suspensions and the settlement velocity of fluid mud. The settling velocity W is studied as a stochastic variable and it is observed that it is gamma distributed. The settlement velocity V is scalar as the sediments in a layer of fluid mud fall with no differential velocity. Finally, the hindered settling velocity is a transition between W and V. Mots cles : vitesse de chute, vase, tassement, suspension, estuaire, Loire.

Distribution des sédiments cohésifs en relation avec la vitesse de la phase solide dans l’estuaire de la Loire