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A reduced-gravity non-linear layer nwdel is developed in order to study river plumes. This stationnary nwdel, based on a simpler one found in literature, considers mass and nwmentum exchanges in the frontal zone. Interjacial friction has been introduced to take into account the wind and underlying current effects. Supercritical flow is assumed in the outlet channel, so that characteristics method is used for numerical resolution. It provides a variable grid, strongly akin with theflow properties. For a given accuracy the number of grid points is reduced by several orders of magnitude compared with afixed orthogonal mesh grid. This grid is felt to be optimal for implementing data assimilation. The nwdel shows the influence of thefront on the plume dynamics, and non-linear advective terms are well represented. The computed flow is comparable with measurementsmade with the VHFradar of the laboratory near the Rhone's mouth. The model will be improved wilh data assimilation, then il could be applied to other coastal effluents or coupled with a sediment transport nwdel.

Modélisation du panache du Rhône : comparaison avec des mesures de courantométrie par radar VHF. Etude de sensibilité du modèle en vue de l'assimilation des données