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Groundwater Circulation in Fractured and Karstic Aquifers of the Umbria-Marche Apennine
Water ( IF 3.4 ) Pub Date : 2020-04-07 , DOI: 10.3390/w12041039
Andrea Tamburini , Marco Menichetti

The Umbria-Marche Apennine has a large number of springs that drain water stored in carbonate formations. Spring groundwater constitutes a crucial freshwater resource for many countries, regions, and cities around the world. This study aimed to understand the hydrological mechanisms behind groundwater circulation and their relationship to the structural and stratigraphic settings of specific aquifers. Recession analysis and time series analysis were applied to the daily discharge of six springs monitored over eight years. Both analyses indicated the presence of two types of aquifers: aquifer with unimodal behavior and aquifer with bimodal behavior. The first are characterized by two hydrodynamic sub-regimes, in which fracture networks control the baseflow and conduit networks control the quickflow. In contrast, other springs present only one hydrodynamic sub-regime related to fracture network drainage. Time series analysis confirms the results of recession analysis, showing a large memory effect and a large response time, implying the dominance of the baseflow sub-regime. These results indicate that the Maiolica Formation is characterized by a high degree of fracturation and slight karstification, which control infiltration and percolation, whereas the Calcare Massiccio Formation regulates groundwater circulation in the deeper zones of the aquifer, characterized by a high degree of karstification through moderately developed conduit networks.

中文翻译:

翁布里亚-马尔什亚平宁断裂含水层和岩溶含水层中的地下水循环

翁布里亚-马尔什亚平宁山脉有大量泉水,可以排出储存在碳酸盐岩地层中的水。春季地下水是世界上许多国家、地区和城市的重要淡水资源。本研究旨在了解地下水循环背后的水文机制及其与特定含水层结构和地层环境的关系。对 8 年来监测的 6 个泉水的日排放量应用了衰退分析和时间序列分析。两种分析都表明存在两种类型的含水层:具有单峰行为的含水层和具有双峰行为的含水层。第一个的特点是两个流体动力学子机制,其中裂缝网络控制基流,管道网络控制快速流。相比之下,其他泉水仅存在一个与裂缝网络排水相关的水动力子机制。时间序列分析证实了衰退分析的结果,显示出较大的记忆效应和较大的响应时间,暗示基流子制度的主导地位。这些结果表明 Maiolica 组的特征是高度破裂和轻微的岩溶作用,控制了渗透和渗流,而 Calcare Massiccio 组调节了含水层较深区域的地下水循环,其特征是通过适度的岩溶程度发达的管道网络。这意味着基流子制度的主导地位。这些结果表明 Maiolica 组的特征是高度破裂和轻微的岩溶作用,控制了渗透和渗流,而 Calcare Massiccio 组调节了含水层较深区域的地下水循环,其特征是通过适度的岩溶程度发达的管道网络。这意味着基流子制度的主导地位。这些结果表明 Maiolica 组的特征是高度破裂和轻微的岩溶作用,控制了渗透和渗流,而 Calcare Massiccio 组调节了含水层较深区域的地下水循环,其特征是通过适度的岩溶程度发达的管道网络。
更新日期:2020-04-07
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