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Influence of Low Sea-Dike Crown-Walls on Wave Overtopping Discharge

Extensive laboratory experiments were carried out to investigate the efficiency of low (vertical) crown-walls on the reduction of wave overtopping on sea-dikes. It is shown that the reduction of wave overtopping discharge by crown-walls is inadequately described in the TAW-2002 guidelines. A new approach for the wall influence has therefore been developed, explicitly taking into account both the wall height and the promenade width. The approach can straightforwardly be incorporated in the original formulations of TAW-2002 to significantly improve the prediction of wave overtopping on sea-dikes crowned with this type of walls.