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                            &lt;br /&gt;
                            Ce produit contient, sous forme numérique maillée, les prévisions horaires de surcotes météorologiques et de hauteurs d'eau par rapport au niveau moyen, calculées à l’aide du modèle hydrodynamique HYCOM 2D sur les façades maritimes métropolitaines et à l’échelle côtière en Antilles-Guyane et à Mayotte-Réunion.&lt;br /&gt;
                            &lt;br /&gt;
                            &lt;em&gt;Plus d'informations : &lt;a href="https://services.data.shom.fr/static/specifications/Descriptif_Contenu_oceano_niveaux.pdf" title="accès aux spécifications techniques" target="_new"&gt;spécifications techniques&lt;/a&gt;&lt;/em&gt;&lt;br /&gt;</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#EN">&lt;em&gt;Surge and water level data updated on: 23-10-2024T00:00Z&lt;/em&gt;&lt;br /&gt;
                                &lt;br /&gt;
                                This product features numerical forecasts of storm surges and water level with respect to the mean sea level, computed using the HYCOM 2D hydrodynamic model for the French mainland coasts and for Caribbean and Guyana, SW Indian ocean overseas territories.&lt;br /&gt;
                                &lt;br /&gt;
                                &lt;em&gt;More information (in French): &lt;a href="https://services.data.shom.fr/static/specifications/Descriptif_Contenu_oceano_niveaux.pdf" title="access to product user manual (in french)" target="_new"&gt;product user manual&lt;/a&gt;&lt;/em&gt;&lt;br /&gt;</gmd:LocalisedCharacterString>
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                            Les modèles développés, dont les résultats sont affichés sur ce portail, sont ceux exploités et analysés par les prévisionnistes de Météo-France dans le cadre du système national français de vigilance vagues submersion.</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#EN">Scientific studies and technical developments are carried out within the framework of the HOMONIM project conducted in partnership between Météo-France and Shom with grant from the Ministry of Ecological Transition. The main objective of the project is to continuously improve storm tide and coastal waves forecast capabilities to help better determine which areas may be affected and hazardous.
                                    The models developed, whose results are displayed on this portal, are then primarily operated by Météo-France to feed the French national waves and storm-tide awareness system.</gmd:LocalisedCharacterString>
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        <gco:CharacterString>Glossaire :
                            -	Niveau moyen : le niveau moyen serait le niveau de la mer au repos (notamment en l'absence de marée, de vent et sous une pression atmosphérique moyenne (1013 hectoPascal = 760 mm de mercure). A ne pas confondre avec la hauteur d'eau par rapport au zéro des cartes
                            -	Surcote : en présence de phénomènes météorologiques (dépressions, vent...) ou océanographiques (vagues, houle, courants...), le niveau de la mer peut s'écarter notablement de la valeur attendue en l'absence de ces perturbations, sous la seule influence de la marée. Lorsque le niveau est supérieur à la prédiction, on parle de surcote ; lorsqu'il est inférieur, de décote
                            L'importance des surcotes et décotes dépend du lieu considéré (topographie des fonds marins, courants, exposition aux vagues et à la houle...) et des conditions météorologiques (vent et pression atmosphérique)
                            Lorsqu'une surcote se produit au voisinage d'une pleine mer en période de vives-eaux, il existe un risque important de submersion des zones côtières vulnérables.</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#EN">Glossary:
                                    - Mean sea level would be the sea level at rest (absence of tides and atmospheric effects (no wind, average atmospheric pressure of 1013 hectoPascal = 760 mm of mercury). Not to be confused with the height of water in relation to chart datum
                                    - Storm surge: in the presence of meteorological event (low atmospheric pressure and strong winds) or oceanographic phenomena (waves, swell, currents...), the sea level can deviate significantly from the value expected in the absence of these disturbances when only influenced by tides. When the sea level is higher than the maximum predicted tide, it is called a storm surge.
                                    The magnitude of the surge depends on the location (seabed topography, currents, exposure to waves and swell, etc.) and the meteorological conditions (wind and atmospheric pressure).
                                    When a storm surge occurs in the vicinity of high water during spring tides, there is a significant risk of coastal flood on low-lying vulnerable areas.</gmd:LocalisedCharacterString>
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                        <gco:Date>2013-12-10</gco:Date>
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            <gco:CharacterString>Pour modéliser les niveaux d'eau, le Shom utilise une version barotrope (2D) du modèle HYCOM (https://hycom.org/) configuré sur 2 domaines en métropole (proche Atlantique et Méditerranée) et deux domaines outre-mer (Antilles/Guyane et S-O de l’océan indien). 
                                    Ces modèles ont été adaptés par le Shom à la modélisation des zones côtières par la prise en compte, notamment, du forçage par la marée, de paramétrisations optimisées et de bathymétries spécifiques haute résolution en zone côtière (de 500 m pour les emprises régionales à 100m pour les MNT de façade) utilisant notamment les levés Litto3D par LIDAR aéroportés. 

                                    Les prévisions de niveaux d’eaux sont calculées sur des grilles de calcul curviligne dont la maille varie de 500m à 1.5km sur les côtes françaises métropolitaines et sur la façade des Antilles et de la Guyane. Une descente d'échelle par imbrication permet une résolution de 200m à 800m autour des îles de La Réunion et Mayotte. 
                                    Ce modèle s’appuie sur les prévisions de vent et de pression atmosphérique issues de : (i) modèle Arpege de Météo-France (grille EURAT01, résolution de 0,1°) pour la métropole, (ii) modèles régionaux Arome Outre-mer de Météo-France (grilles CARAIB0025, GUYANE0025, INDIEN0025, résolution de 0.025°) et (iii) modèle CEP-IFS de l'ECMWF (grille GLOB0125) pour l'outre-mer.
                                    Aux frontières ouvertes, le forçage de marée utilisé est issu de l’atlas de marée NEA pour la France métropolitaine ou du modèle FES du LEGOS pour les domaines outre-mer. 

                                    Version de configurations utilisées :
                                    -	Configuration HYCOM-ATL, V4 juin 2017 (façade Manche-Atlantique de la France métropolitaine).
                                    -	Configuration HYCOM-MED, V2 janvier 2015 (façade méditerranéenne de la France métropolitaine).
                                    -	Configuration HYCOM ANT-GUY, V2 mai 2020 (façades des Antilles – Saint-Barthélemy, Guadeloupe et Martinique – et de la Guyane).
                                    -	Configuration HYCOM-IND, V2 décembre 2019 (Océan indien autour des îles de La Réunion et Mayotte).</gco:CharacterString>
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                <gmd:LocalisedCharacterString locale="#EN">The Shom uses a 2D barotropic version of the HYCOM model (https://hycom.org/) to compute water level /storm surge forecasts.
                                         The configurations have been set up on 4 domains (European Atlantic, Mediterranean sea, Caribbean and Guyana, SW Indian ocean). 
                                         These models have been adapted by Shom to address coastal issues by taking into account, the tide forcing, optimized parameterizations and dedicated high resolution bathymetry (from 500 m for regional coverage to 100m for coastal DTMs) using Litto3D surveys by airborne LIDAR.
                                            Water level forecasts are computed by using curvilinear grids at variable resolution ranging from 1.5km offshore to 500m on the coast for the French mainland coast and the Antilles and Guyana coast. A downscaling process is implemented in Indian ocean to reach a resolution of 200m to 800m on around La Réunion and Mayotte islands.
                                            Meteorological forcing: (i) ARPEGE model (EURAT01 grid) from Météo-France for French mainland area, (ii) AROME models (CARAIB0025, GUYANE0025, INDIEN0025 grids) from Météo-France and (ii) CEP-IFS model (GLOB0125 grid) from ECMWF for overseas areas.
                                            Open boundary forcing: NEA tidal atlas or LEGOS FES according to the considered area.

                                            Configurations of HYCOM2D setup depending on the considered area:
                                            - Configuration HYCOM-ATL: Version 4, june 2017.
                                            - Configuration HYCOM-MED: Version 2, january 2015.
                                            - Configuration HYCOM ANT-GUY: Version 2, may 2020.
                                            - Configuration HYCOM-IND: Version 2, december 2019.</gmd:LocalisedCharacterString>
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