Elementary polygons of bodies of groundwater — Guadeloupe — State version of the Premises 2013

A body of groundwater is a distinct volume of groundwater within one or more aquifers, constituting the elementary separation of aquatic environments to be the WFD assessment unit. It makes it possible to define environmental objectives, to assess the state of the media and subsequently to verify the achievement of those objectives. The groundwater bodies, building on the work carried out on the BDRHF V1 hydrogeological benchmark, were identified and delimited for the first time in 2004 and were updated in 2010. They were reported to the European Commission on the implementation of the WFD on 22 March 2010, followed by a corrective report in February 2011, taking into account the latest updates. At the beginning of 2013, work was carried out to bring the version reported to Europe back to Europe in February 2011 in order to bring it into line with the Sandre format. This version is always available on the pike-perch website; However, it contains a number of anomalies, which are present in the reported data and highlighted in the BRGM/RP-62141-FR report. These anomalies have been corrected in this version of the Water Mass: The version of the ‘internal 2013 water body benchmark’ results from the update by the Lieux State, in accordance with the Sandre data models and consolidated at national level, on the website www.sandre.eaufrance.fr. This reference version comes from the State of Premises 2013 and is not reported to the European Commission. This version used at national level makes it possible to prepare the 2016-2021 SDAGE. The layers are distributed in a format consistent with the picker data dictionary of the Water Benchmark Ref. version 1.2. The breakdown chosen for water bodies follows the following main principles: Water bodies are delimited on the basis of geological and hydrogeological criteria; Recutting of water bodies to take account of the effects of anthropogenic pressures should remain limited. Water body boundaries must be stable and sustainable Like surface water bodies, the delimitation of groundwater bodies is organised on the basis of a typology. This typology is largely based on that developed for hydrogeological entities defined in the context of the revision of the HF DB. It is based on the geological nature and hydrodynamic behaviour or large operation of aquifer systems (nature, flow rate). It comprises two levels of main and secondary characteristics. Water bodies may have exchanges between them. All water supply catchments, supplying more than 10 m³/day of drinking water or used for water supply for more than 50 people, must be included in a water body. Deep groundwater, unrelated to water courses and surface ecosystems, in which no abstraction takes place and which is not likely to be used for drinking water because of its quality (salinity, temperature, etc.), or for technical and economic reasons (disproportionate cost of abstraction) may not constitute bodies of water. Given its size, a body of water may have a degree of spatial heterogeneity in terms of both its hydrogeological characteristics and its qualitative and quantitative state. At any point more than one water body may overlap. The PolygMasseDEauSouűine layer is the result of the single-file agglomeration of all groundwater bodies divided into elementary multipolygons corresponding to each of their depth level. The entire national territory is covered, the polygons overlap. In other words, if one seeks to identify the water bodies present at a point in the territory, this layer will be able to make 1 to 10 water bodies differentiated only in the order of the associated overlay. In line with the data dictionary V1.2, the layer consists of the same attributes as the MasseDEauSouine layer with: — The addition of the ‘Level’ field: Depth level of the elemental multipolygon of the groundwater body; — The addition of the “CdPolygMasseDEauSou-ine” field: Unique code for the elemental multipolygon of the groundwater body.地下水水体（groundwater body）是指一个或多个含水层内的独立地下水体单元，是水框架指令（Water Framework Directive, WFD）规定的水文环境基本划分单元与评估单元。其可用于明确水环境目标、评估介质现状，并后续验证该目标的达成情况。 本次地下水水体的划分基于法国水文地质基准数据库V1（Base de Données Hydrogéologique Française V1, BDRHF V1）的相关研究成果，于2004年首次完成识别与划界，并在2010年进行了更新。2010年3月22日，相关成果随水框架指令（WFD）实施情况报送至欧盟委员会，随后于2011年2月结合最新更新内容提交了修正报告。2013年初，为使2011年2月报送欧盟的版本符合法国水文数据参考系统（Système d'Information sur l'Eau et les Données de Référence, Sandre）格式规范，相关修订工作启动。 该版本可于梭鲈（pike-perch）官方网站获取，但其中存在多类数据异常，此类异常源自报送数据本身，并已在法国地质与矿业研究局（Bureau de Recherches Géologiques et Minières, BRGM）编号为RP-62141-FR的报告中予以标注说明。 本次发布的水体数据集版本已修正上述异常："2013年内部水体基准"版本由地方主管部门依据法国水文数据参考系统（Sandre）数据模型更新，并于国家层面完成整合，可通过官网www.sandre.eaufrance.fr获取。该参考版本源自2013年基准现状数据，未向欧盟委员会报送。该国家级使用版本可用于编制2016-2021年流域水环境综合管理规划（Schéma Directeur d'Aménagement et de Gestion des Eaux, SDAGE）。 本数据集图层采用与水文基准参考版本1.2的PICKER数据字典一致的格式进行分发。 本次地下水水体的划分遵循以下核心原则： 1. 地下水水体的划界以地质与水文地质条件为依据； 2. 因人为活动压力影响而需对水体边界进行调整的情形应受到严格限制； 3. 水体边界需保持稳定且具备可持续性。 与地表水体一致，地下水水体的划界基于类型学框架开展。该类型学体系主要源自水文地质数据库（Hydrogeological Database, HF DB）修订过程中针对水文地质实体构建的分类标准，以含水层系统的地质属性、水动力特征或宏观运行特性（如介质类型、径流速率）为核心依据，包含主、次两级特征层级。 地下水水体之间可存在水力联系。 所有日供水量超过10立方米或服务人口超过50人的饮用水供水集水区，均需纳入某一地下水水体范畴。 与地表水及地表生态系统无水力联系的深层地下水，若未进行取水活动，且因水质问题（如盐度、温度等）或技术经济原因（取水成本过高）不适宜作为饮用水源，则可不纳入地下水水体范畴。 受自身规模影响，地下水水体在水文地质特征、水质与水量现状等方面均可能存在一定程度的空间异质性。 任意空间点位上可能存在多个地下水水体重叠分布的情况。 PolygMasseDEauSouine图层是将所有地下水水体按深度层级划分为基本多面要素后，通过单文件聚合生成的数据集图层。该图层覆盖全部国家领土范围，且多边形要素存在重叠。换言之，若需识别某一空间点位所属的地下水水体，该图层可返回1至10个按叠加顺序区分的地下水水体结果。 依据数据字典V1.2规范，该图层与MasseDEauSouine图层拥有相同的属性字段，同时新增了以下两个字段： - `Level`字段：表示地下水水体基本多面要素的深度层级； - `CdPolygMasseDEauSouine`字段：表示地下水水体基本多面要素的唯一编码。