Dynamics of a dense gravity current flowing over a corrugation

► We perform a high resolution idealized isopycnal model changing the aspect ratio of a ridge/canyon. ► The control run is in an eddy-regime and the frequencies of the eddies coincide with Filchner overflow. ► Ridges are more effective than canyons in transporting the overflow to the deep ocean. ► Corrugation Burger number (Buc) can be used as a parameter to describe the flow over topography.