THESIS 2011 : Transport sédimentaire par l'approche diphasiquePrésentation The THESIS-2011 (Symposium on Two-phase Modelling for Sediment Dynamics in Geophysical Flows) has the following objectives: 1-To establish a forum for discussing and exchanging experience and knowledge within the international research community for developing two-phase approaches applicable to sediment dynamics in geophysical flows; 2-To review the state-of-the-art of the two-phase approach for sediment dynamics; 3-To promote international cooperation and promote development of a research agenda for this research domain.