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On propose une nouvelle methode pour traiter les problemes de conditions aux limites dans un modele de Saint-Venant barotrope linearise. Elle combine un decouplage des equations avec une methode de relaxation newtonienne. On demontre theoriquement qu'elle permet d'evacuer les ondes sortantes sans modifier l'ecoulement dans le domaine physique etudie, contrairement aux methodes habituelles. Les resultats...