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                <gmd:LocalisedCharacterString locale="#EN">NIVEAUX: HYCOM2D hydrodynamic model (water level / surge) - R5200_REU-CG - Data of 2026-04-23</gmd:LocalisedCharacterString>
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        <gco:CharacterString>&lt;em&gt;Données de surcote et de hauteur d eau à jour du : 22-04-2026T18:00Z&lt;/em&gt;&lt;br /&gt;
                            &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 TOLOSA-SW pour la zone Atlantique/Manche/Mer du Nord et du modèle HYCOM 2D pour la façade maritime méditerranéenne 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: 22-04-2026T18:00Z&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 TOLOSA-SW (Shallow water code) hydrodynamic model for for the Atlantic/Channel/North Sea domain and the HYCOM 2D model for the mediterranean coasts and for Caribbean and Guyana, SW Indian ocean overseas domains.&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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                            &lt;br /&gt;Utilisation libre sous réserve de citer la source.</gco:CharacterString>
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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)
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                                    - 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:CharacterString>Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services</gco:CharacterString>
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                    <gco:CharacterString>INSPIRE Data Specification on Oceanographic geographical features – Technical Guidelines v3.0</gco:CharacterString>
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                    <gmd:CI_Date>
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                        <gco:Date>2013-12-10</gco:Date>
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                        <gmd:CI_DateTypeCode codeList="http://www.isotc211.org/2005/resources/codeList.xml#CI_DateTypeCode" codeListValue="publication" />
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                <gco:CharacterString>Information sur la conformité de la ressource à une spécification (INSPIRE).</gco:CharacterString>
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          <gmd:statement xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>Pour modéliser les niveaux d'eau, le Shom utilise deux codes numériques: une version barotrope (2D) du code HYCOM (https://hycom.org/) configuré sur les 3 domaines Méditerranée, Antilles-Guyane et Océan Indien, et le code Shallow Water de TOLOSA (https://tolosa-project.com/, SHOM/INSA Toulouse), Tolosa-SW, configuré sur le domaine Atlantique/Manche/Mer du Nord. 
                                    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 configurations HYCOM utilisent des grilles curvilinéaires à résolution variable atteignant 1.5km sur les côtes françaises méditerranéennes et sur la façade Antilles-Guyane. Une descente d'échelle par imbrications permet une résolution de 200m à 800m sur le domaine Indien. La configuration TOLOSA sur la façade Atlantique utilise une grille non structurée d'une résolution côtière allant de 100 à 200m.
                                    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 TOLOSA-ATL, V1 octobre 2024 (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">In order to compute water level /storm surge forecasts, the Shom uses the Shom uses two numerical codes: a barotropic (2D) version of the HYCOM code (https://hycom.org/) configured for the 3 Mediterranean, Antilles-Guyane and Indian Ocean domains, and TOLOSA's Shallow Water code (https://tolosa-project.com/, SHOM/INSA Toulouse), Tolosa-SW, configured for the Atlantic/Channel/North Sea domain.
                                            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.
                                            HYCOM configurations use curvilinear grids with variable resolution, enabling coastal resolutions of 1.5km on the French mediterranean coasts and on the Antilles-Guyane coast; downscaling by embedded grids enables resolution from 200m to 800m over the Indian domain. The TOLOSA configuration on the Atlantic coast uses an unstructured grid with a coastal resolution of 100 to 200m. 
                                            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 TOLOSA-ATL: Version 1, october 2024.
                                            - 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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        <gco:CharacterString>Métadonnées publiques et gratuites</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#EN">Free and public metadata</gmd:LocalisedCharacterString>
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