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        <gco:CharacterString>Une zone homogène de dragage (ZHD) est définie comme un secteur dont la constitution des sédiments est homogène chimiquement et physiquement.

La définition des zones homogènes de dragage au sein d’un port permet d’établir un plan d’échantillonnage en définissant le nombre d’échantillons à réaliser préalablement à l’opération de dragage selon la situation de la ZHD (en zone à échange libre ou confinée) et le volume à draguer (conformément à la Circulaire n°2000-62 du 14 juin 2000 et à ses instructions techniques).

Cette couche géographique représente les zones homogènes de dragage des ports maritimes pour lesquelles le Cerema dispose de données surfaciques. Cette couche a vocation à évoluer en fonction des réponses des gestionnaires portuaires aux enquêtes annuelles sur les dragages maritimes.

Description des champs :
- Nom ZHD : nom de la Zone Homogène de Dragage
- Code ZHD : identifiant de la Zone Homogène de Dragage
- longitude et latitude :  chaque ZHD est localisée de manière ponctuelle par un couple de coordonnées XY (WGS84-EPSG4326). Le point a été placé historiquement de manière arbitraire, au niveau le plus représentatif de la zone, sans forcément correspondre exactement au centroïde de la géométrie surfacique aujourd'hui disponible.
- Nom port : nom du port [uniquement sur la couche de points]

Description de la table des quantités draguées par année :
- Année
- Code de la ZHD
- Nom de la ZHD
- Somme QMS draguée : quantité matière sèche draguée (en milliers de tonnes)</gco:CharacterString>
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