Marine Submersion — Aléa Franchissement Speed T100 — Dunkirk Urban Community

A marine submersion is a temporary and possibly episodic flood of coastal areas, generated by the neighbouring sea, with salt water or brackish water, during weather events (storm, cyclone, strong depression and sea wind) or oceanographic (swell, tidal, tsunami) events of very unusual magnitude. It begins when the highest jets of seawater on the maritime edge surpass the crest of coastal accumulations, causing water and sometimes sediment to transfer to the shoreline shoreline. Hazard is defined as the intensity of a natural event characterised by probability. A hazard relating to a phenomenon and its period of return. Hazard T100 Franchisation speed: defines the speed of water penetration during a crossing of Péret and during a centennial event.