Groundwater bodies — Guadeloupe — Version State of the Places 2019

A body of groundwater is a separate volume of groundwater within one or more aquifers, constituting the elementary separation of aquatic environments to be the WFD assessment unit. Groundwater bodies are derived from work carried out on the BDLISA repository. The cut-off for water bodies follows the following key principles: — Water bodies are demarcated on the basis of geological and hydrogeological criteria; — The redistribution of water bodies to take account of the effects of anthropogenic pressures must remain limited; — The limits of water bodies must be stable and sustainable; — Like bodies of surface water, 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 BDLISA. It is based on the geological nature and hydrodynamic behaviour or “big” functioning of aquifer systems (nature, flow rate). It has 2 levels of characteristics (main and secondary); — Water bodies may have exchanges between them; — All water for drinking water supplying more than 10 m³/day or used for the supply of water for more than 50 persons must be included in a body of water; — Deep groundwater, unrelated to rivers and surface ecosystems, from which no sampling 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 (cost of disproportionate abstraction) may not constitute bodies of water; — Given its size, a body of water may have a certain spatial heterogeneity in terms of both its hydrogeological characteristics and its qualitative and quantitative status; — At any point several bodies of water can be superimposed. (source: according to BRGM, WFD IMPLEMENTATION: Identification AND DELIMITATION OF SOUTERRAINE WATER MASSES — methodological guide, January 2003) DCE reporting correspondence: this entity corresponds to WISE’s Ground Water Body (GWB) concept. The layers are distributed in a format consistent with the SANDRE Data Dictionary of the Water Body Reference, version 1.4.地下水体是赋存于一个或多个含水层中的独立地下水单元，是水生环境的基本划分单元，同时作为水框架指令（Water Framework Directive, WFD）的评估单元。 地下水体源自BDLISA数据库中的相关研究工作。 水体的边界划定遵循以下核心原则： — 水体以地质与水文地质标准为依据进行划定； — 为考量人为压力影响而对水体边界进行的调整必须受到严格限制； — 水体边界必须具备稳定性与可持续性； — 与地表水水体一致，地下水体的划定基于类型学框架。该类型学主要源自BDLISA修订版中定义的水文地质实体分类体系，以含水层系统的地质属性、水动力特征或“宏观”运行机制（如含水层性质、水流速率）为依据，分为两级特征层级（主特征与次特征）； — 不同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人的饮用水供水水源，均需纳入地下水体范畴； — 与河流及地表生态系统无关联、未开展采样工作，且因水质问题（如盐度、温度等）或技术经济原因（抽取成本过高）无法用作饮用水的深层地下水，可不纳入地下水体范畴； — 受自身规模影响，地下水体在水文地质特征、水质与水量状态等方面可能存在一定空间异质性； — 在同一空间位置可存在多层地下水体。 （来源：依据法国地质矿业研究局（Bureau de Recherches Géologiques et Minières, BRGM）2003年1月发布的《水框架指令实施：地下水体识别与划定方法学指南》） 数据报送对应关系：此实体契合WISE的地下水体（Ground Water Body, GWB）概念。 数据集图层采用与《水体参考SANDRE数据字典（1.4版）》一致的格式进行发布。