Since 1976, the municipality of Nice has been monitoring the "Promenade des Anglais" beach through a total of 50 measurement transects. Comparison of two high precision GNSS surveys carried out at the end of November and December 2013 enable detection of the impacts of the 25 th December Storm Dirk on the beach. Modelling of the hydrodynamics at high spatial resolution provides further useful information on storm impacts.