Within the Footprint project, the interactions between offshore wind turbines and the sandwaves on which they are built are being studied. Turbines affect the surrounding hydrography, and the topography of the sediment. Subsequently, these changes may affect the biogeochemistry of the seafloor. In turn, migrating bedforms may endanger offshore structures (e.g. OWFs and cables). Within this project, new hydrodynamic and biological models will be developed to estimate the effects of offshore windfarms on permeable sediments in the Southern North Sea.