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La submersion marine désigne une inondation temporaire de la zone côtière par la mer lors du passage d'un cyclone. <\/SPAN>4<\/SPAN> niveaux (faible, moyen, fort<\/SPAN>, très fort<\/SPAN>) d'aléas de période de retour 100 ans sont cartographiés, ainsi que 2 bandes traduisant un \"sur-aléa\" très fort: la bande de précaution qui correspond à la rupture éventuelle d\u2019un ouvrage de protection, la bande de choc mécanique des vagues en raison des fortes vitesses, de l'action de la houle et des possibles projections de galets ou de coraux. <\/SPAN><\/P>

<\/P>

Généalogie<\/SPAN><\/P>

Fusion des zones d'aléa de référence par débordement et par franchissement, puis lissage des contours des polygones.<\/SPAN><\/P>

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