Port infrastructures are actually in risk due to changes in the local sea level or in the wave regime induced by climate change or anthropogenic actions. All these factors can be modified in response to climate change or to local geomorphologic modifications related to dredging operations or works or port infrastructures. The series of storms during the winter 2013-14 hightlighted the need to investigate the capability and efficiency port defences against the sea. The port defences facilities (dykes, piers, breakwaters…) are generally adapted to boatyards and docks protection considering the actual mean sea level and can absorb ocean waves or storm surges that occur at least every 50 years and more frequently every 30 years. Otherwise, the location, the orientation and the size of these facilities are defined on the basis of technical studies which tatake into consideration direction of wind and waves on astronomical and meteorological tidal characteristics and on the actual mean sea level. So, regarding the costs to implement such infrastructures, some ports do not benefit from an optimal protection.As a result there are increasing requests from port users and customers to improve the protection of harbour basins and boatyards in ports.