Maps of the vulnerability of groundwater to seawater intrusion were developed for the multi-layered coastal aquifer of Ouled Taoui—Ouled Boujemaa in Algeria. Groundwater in this area is threatened by the risk of salinization due to excessive groundwater use. To protect this aquifer, mapping the vulnerability to potential saline intrusion was carried out using a modified GALDIT index mapping model that takes into account six parameters, namely: (G) groundwater occurrence, (A) aquifer hydraulic conductivity or network development and persistence index (IDPR), (L) depth to groundwater level above sea, (D) distance from shore, (I) impact on the existing status of seawater intrusion in the area, and (T) It’s the thickness of the aquifer. A system for rating, weighting and classifying the GALDIT model according to the relative importance of these parameters was developed under a GIS environment. The compilation results illustrate that the underlying confined aquifer with clay levels characterizing a low hydraulic potential. It will be more vulnerable during excessive pumping and in the presence of karst conducts, which produces an impact of salinity decay as soon as one moves away from the shore. The assessment indicated that the vulnerability of the uppermost unconfined aquifer was particularly sensitive to changes in the weights of parameters (A), (L) and (D). Areas with a “high” vulnerability to seawater intrusion are located especially in the coastal fringe. The results of the vulnerability assessment were validated based on: the density and distribution of existing groundwater production wells, the land cover map, and the hydrochemical quality of groundwater. Finally, the identification of areas of “high” vulnerability to saline intrusion will serve as a tool for the management, control, and protection of coastal groundwater resources.

为阿尔及利亚的奥勒德·陶伊（Ouled Taoui）—奥勒德·布吉玛（Ouled Boujemaa）多层沿海含水层绘制了地下水对海水入侵的脆弱性图。由于过度使用地下水，该地区的地下水受到盐碱化的威胁。为了保护该含水层，使用改良的GALDIT指数映射模型对脆弱性进行了潜在盐渍入侵的映射，该模型考虑了六个参数，即：（G）地下水的发生，（A）含水层的水力传导率或网络发展和持久性指数（IDPR），（L）到海平面以上的地下水位的深度，（D）距海岸的距离，（I）对该地区海水入侵现状的影响，以及（T）它是含水层的厚度。评分系统 在GIS环境下，根据这些参数的相对重要性对GALDIT模型进行加权和分类。汇编结果表明，底层的承压含水层的黏土含量低，具有潜在的水力潜力。在过度抽水和存在喀斯特地貌的情况下，它会变得更加脆弱，一旦人们离开海岸，就会产生盐度衰减的影响。评估表明，最上方无限制含水层的脆弱性对参数（A），（L）和（D）权重的变化特别敏感。海水入侵的“高度”脆弱性区域尤其位于沿海边缘。脆弱性评估的结果基于以下因素进行了验证：现有地下水生产井的密度和分布，土地覆盖图以及地下水的水化学质量。最后，确定盐分入侵的“高度”脆弱性区域将作为管理，控制和保护沿海地下水资源的工具。