Complex hydrodynamics are present at the confluence of a river and his discordant tributary, which heaviliy impact the morphology of the riverbed. well-known examples of morphological features which can develop at these locations are scour holes and bank-attached bars. An understudied morphological phenomena that can arise at these confluences are in-river deltas. These in-river deltas form for example in the river Meuse at the outlet of the Geul and the Berwinne. The goal of this research is to understand the formation and evolution of this in-river detlas. Furthermore, their implications on the sediment budget of the Meuse is investigated.  To do so, bathymetrical analyses will be peformed and scenario runs will be done with the 2D model of the Meuse.