Abstract The Haouz plain aquifer is one of the most important aquifers in Morocco. It is supporting so many activities tightly connected to the local and national socioeconomic development (agriculture, tourism, industry). The recurrent drought the region has been experiencing, had led to a major mobilization of groundwater to meet human needs and socioeconomic objectives. A hydrogeochemical, isotopic and statistical study based on field data was conducted to understand the functioning of the aquifer, to characterize the processes controlling the groundwater's chemistry, as well as identify areas presenting water salinity anomalies. The objective of this study is to develop a conceptual model of functioning of the Haouz aquifer, leading to a better comprehension of the spatial evolution of mineralization regarding the geological frame and the current context of exploitation to evaluate groundwater suitability for domestic and agricultural use. The Plio-Quaternary aquifer water-table contours map showed a flow direction from the High Atlas Mountains, in the south (recharge zone) towards the Tensift bed river in the northwest part of the region. Physico-chemical analysis showed that electrical conductivity are essentially controlled by the chloride and sodium ions and varies over a wide range from 326 to 6800 μS/cm. Regarding irrigation, poor groundwater quality was defined specially near Tensift River in the north of the study area. Stable isotopes contents of water, range respectively from -8.35 to -5.26 ‰ for δ18O and from -54.4 to -32.4 ‰ for δD. The recharge altitude of the aquifer was estimated between 860 and 2110 m, following an altitudinal gradient of 0.25% per 100 m.

中文翻译：

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表征半干旱地区地下水质量和补给过程的水化学和同位素评估：以 Haouz 平原含水层为例（摩洛哥中部）

摘要 Haouz 平原含水层是摩洛哥最重要的含水层之一。它支持与地方和国家社会经济发展（农业、旅游、工业）密切相关的许多活动。该地区正在经历的反复干旱导致地下水的重大调动，以满足人类需求和社会经济目标。进行了基于现场数据的水文地球化学、同位素和统计研究，以了解含水层的功能，表征控制地下水化学的过程，并确定存在水盐度异常的区域。本研究的目的是开发 Haouz 含水层功能的概念模型，导致更好地理解关于地质框架和当前开采背景的矿化空间演化，以评估地下水对家庭和农业使用的适宜性。Plio-第四纪含水层地下水位等高线图显示了从南部（补给区）的高阿特拉斯山脉向该地区西北部的 Tensift 河床的流动方向。物理化学分析表明，电导率基本上由氯离子和钠离子控制，并在 326 至 6800 μS/cm 的宽范围内变化。在灌溉方面，研究区北部 Tensift 河附近的地下水水质较差。水的稳定同位素含量分别为-8.35～-5.26‰的δ18O和-54.4～-32.4‰的δD。