Dune erosion is a relatively fast developing cross-shore transport process which occurs during severe wave attack combined with high water levels. Large quantities of sand coming from the dunes are transported seaward. If no seaward or lateral losses occur, the sand balance will be closed in cross-shore direction. The eroded sand will deposit on the beach and foreshore in such a way that a so-called erosion profile appears. For the judgement of the safety of the Dutch dune coast a method is used to compute, for given design conditions, the amount of dune erosion. The core of the method is the so-called DUROS-model. This model does not take into account the effect of the wave period on the amount of dune erosion and was developed for the at that time supposed reach of peak wave periods for the Dutch coast (Tp