Make long-term prediction of shoreline evolution ranging from days to centuries in cases where 2D effects are important, such as areas with complex bathymetries. With MIKE 21 SM, the sediment volume deposited during each time step is integrated across the shore face. The morphology is then updated according to the continuity equation for the shoreline using a predefined coastal profile. This unique process eliminates the effect of the cross-shore transport on the morphology, enabling long-term simulations.