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Identifying Karst Aquifer Recharge Areas using Environmental Isotopes: A Case Study in Central Italy

机译：使用环境同位素识别岩溶含水层补给区：以意大利中部为例

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摘要

Water resources management is one of the most important challenges worldwide because water represents a vital resource for sustaining life and the environment. With the aim of sustainable groundwater management, the identification of aquifer recharge areas is a useful tool for water resources protection. In a well-developed karst aquifer, environmental isotopes provide support for identifying aquifer recharge areas, residence time and interconnections between aquifer systems. This study deals with the use of environmental isotopes to identify the main recharge area of a karst aquifer in the Upper Valley of Aniene River (Central Italy). The analysis of 18 O/ 16 O and 2 H/H values and their spatial distribution make it possible to trace back groundwater recharge areas based on average isotope elevations. The Inverse Hydrogeological Balance Method was used to validate spring recharge elevations obtained by the use of stable isotopes. Areas impacted by direct and rapid rainfall recharge into the study area were delineated, showing groundwater flowpaths from the boundaries to the core of the aquifer. The results of this study demonstrate the contribution that spatial and temporal isotope changes can provide to the identification of groundwater flowpaths in a karst basin, taking into account the hydrogeological setting.
机译：水资源管理是全世界最重要的挑战之一，因为水是维持生命和环境的重要资源。为了可持续的地下水管理，确定含水层补给区是保护水资源的有用工具。在发达的岩溶含水层中，环境同位素为确定含水层补给区，停留时间以及含水层系统之间的互连提供了支持。这项研究涉及环境同位素的使用，以识别阿尼内河（意大利中部）上游谷地喀斯特含水层的主要补给区。通过分析18 O / 16 O和2 H / H值及其空间分布，可以根据平均同位素高程来追溯地下水补给区。反水文地质平衡法用于验证通过使用稳定同位素获得的春季补给量高度。划定了直接和快速降雨补给影响研究区域的区域，显示了从边界到含水层核心的地下水流动路径。这项研究的结果表明，考虑到水文地质环境，时空同位素变化可以为喀斯特盆地地下水流径的识别提供帮助。

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