Seabed pattern dynamics and offshore sand extraction

This thesis aims at understanding the long-term morphodynamic e®ects of large-scale o®shore sand extraction, including the potential interaction with sandbank and sandwave dynamics. To that end, we follow an idealized processbased morphodynamic modelling approach, focusing on a tidally dominated o®shore environment where such patterns may exist. Regarding tidal sandbanks, we distinguish between a °at bed and one with sandbanks in morphodynamic equilibrium. On a smaller spatial scale, we investigate the potential interaction of sand extraction and sandwave formation.