By changing flow patterns and sediment transport, aquatic vegetation can affect the development of estuarine bed topography. Besides, since the sediment transport also determines the amount of light available for photosynthetic growth, the presence of vegetation can also affect its own development. This selfsupporting interaction should be taken into account in long-term modelling studies. A process-based model offers the possibility to study this interaction and improve the predictability of eelgrass restoration attempts.