Pim Willemsen^1,2, Bas Borsje¹, Vincent Vuik^3,4, Tjeerd Bouma² and Suzanne J. M. H. Hulscher¹, (1)University of Twente, Water Engineering and Management, Enschede, Netherlands, (2)Royal Netherlands Institute for Sea Research and Utrecht University, Estuarine & Delta Systems, Yerseke, Netherlands, (3)Delft University of Technology, Delft, Netherlands, (4)HKV Consultants, Lelystad, Netherlands