ABSTRACT The objective of this work is to enhance the conceptual hydrogeological model in the Río Cuarto River basin by using isotope and hydrochemical techniques. The precipitation pattern, as reflected in the average values of δ 2H and δ 18O in stations located in the plains and in the mountains, showed an isotope depletion from the East to the West, attributed to continental and altitude effects. Groundwater quality is mainly the result of two controlling factors: lithology and flow distances from recharge. The aquifers show fresh calcium/sodium bicarbonate water in the upper and medium basin (coarse fluvial sediments) which evolve to sodium sulphate and chloride waters in the low basin (mainly loess and fine alluvial sediments). The confined aquifer systems in the lower basin (C and D systems) averaged more negative stable isotope values, indicating that groundwater recharged during colder climatic conditions (Pleistocene period). Groundwater dating with 14C confirmed that groundwater ages range from modern to 45,000 years BP showing that as the water flows towards deeper layers and farther from the mountainous recharge area, groundwater age increases. The confined aquifers can potentially be exploited in order to partly cover different water needs but they should be managed in a sustainable way.

中文翻译：

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应用同位素技术增强概念性水文地质模型并评估阿根廷科尔多瓦潘潘平原的地下水可持续性

摘要 这项工作的目的是通过使用同位素和水化学技术来增强 Río Cuarto 河流域的概念性水文地质模型。降水模式反映在位于平原和山区的站点的 δ 2H 和 δ 18O 的平均值，表明同位素从东到西耗尽，归因于大陆和海拔效应。地下水质量主要受两个控制因素的影响：岩性和补给的流动距离。含水层在上、中盆地（粗河流沉积物）中显示新鲜的钙/碳酸氢钠水，在低盆地（主要是黄土和细冲积沉积物）演变为硫酸钠和氯化物水。盆地下部的承压含水层系统（C 和 D 系统）的平均稳定同位素值为负值，表明地下水在较冷的气候条件下（更新世时期）进行了补给。14C 地下水测年证实，地下水年龄范围从现代到 45,000 年 BP，表明随着水流向更深层和远离山区补给区，地下水年龄增加。承压含水层可能会被开发，以部分满足不同的用水需求，但应以可持续的方式对其进行管理。