The Rhine-Meuse Delta (RMD) is the transition zone between the dischargedriven river branches and the estuarine area, driven by tides, wind and mean sea level. Challenges concerning sediment management relate to oversupply and deposition and the northern and southern boundaries of the area, and ongoing bed erosion in the centre. It is uncertain how these trends will develop and how the area will respond to future changes such as sea level rise. Existing modelling tools fail to predict long-term morphodynamics of the area, because complex processes related to sediment transport are not accounted for. This projects aims to increase knowledge on densitydriven transport of sediment and on the physical interaction between sand and silt and their effect on sediment transport. Implementation of these processes in 1D- and 2D-software will contribute to system knowledge and facilitate long-term morphodynamic modelling of the RMD and other estuaries.