Bob P. Smits¹, Pim Willemsen^1,2, Stijn J. Odink², Bas Borsje², Suzanne J. M. H. Hulscher², Jasper Tjaard Dijkstra¹ and Peter M.J. Herman^1,3, (1)Deltares, Marine & Coastal Systems, Delft, Netherlands, (2)University of Twente, Water Engineering and Management, Enschede, Netherlands, (3)Delft University of Technology, Hydraulic Engineering, Delft, Netherlands