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The study of the mechanical behaviour ofmuddy sediment allows to understand the mechanism of the silting up of the Seine estuary. Rheological data characterize (1) either the sedLment a with high undrained shear strength (Cu of about 1 !c.N.m'Z) which can not be eroded by tidal currents or (2) the fluid mud v/ith low shear strength (ry less than 10 N.m'Z) that are easily eroded by tidal action. The values of Cu vary according to the geographical area and the season variations connected with the river flooding. The mechanism of silting up involve thick deposits of underconsolidated mud Lhat are subsequently spreaded in the estuary area. ln addition, a very quick consolidation process explains the observed muddy deposits L1J. an opened estuary associated with a high tide energy.

Utilisation des paramètres rhéologiques pour la compréhension des processus liés à la dynamique des sédiments fins dans l'estuaire de la Seine