View In:   ArcGIS Online Map Viewer

Name: Zones d'aléa submersion marine

Display Field: id_obj

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: <DIV STYLE="text-align:Left;font-size:12pt"><DIV><DIV><P><SPAN>La submersion marine désigne une inondation temporaire de la zone côtière par la mer lors du passage d'un cyclone. </SPAN><SPAN>4</SPAN><SPAN> niveaux (faible, moyen, fort</SPAN><SPAN>, très fort</SPAN><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’un 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><SPAN /></P><P><SPAN /><SPAN>Généalogie</SPAN></P><P><SPAN /><SPAN>Fusion des zones d'aléa de référence par débordement et par franchissement, puis lissage des contours des polygones.</SPAN></P><P><SPAN>Fusion réalisée par la DEAL avec les bandes de sécurité et de précaution (choc mécanique des vagues)</SPAN></P></DIV></DIV></DIV>

Service Item Id: 5e0aeec439c14b8c8773ccdc82c1fcaa

Copyright Text: BRGM, DEAL Mayotte

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Supports Calculate: true

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YMin: 8562262.4773
XMax: 532559.7635000004
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Spatial Reference: 4471  (4471)

Drawing Info:

Renderer:
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Type ID Field: lb_niveau

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