Alessandrino Luigi, Gaiolini Mattia, Cellone Francisco Aldo, Colombani Nicolò, Mastrocicco Micòl, Cosma Marta, Da Lio Cristina, Donnici Sandra, Tosi Luigi
DiSTABiF - Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, Campania University "Luigi Vanvitelli", Via Vivaldi 43, 81100 Caserta, Italy.
SIMAU - Department of Materials, Environmental Sciences and Urban Planning, Marche Polytechnic University, Via Brecce Bianche 12, 60131 Ancona, Italy.
Sci Total Environ. 2023 Dec 20;905:167058. doi: 10.1016/j.scitotenv.2023.167058. Epub 2023 Sep 13.
Groundwater salinization can be natural and anthropogenic in origin, although it often results from a combination of both, especially in low-lying coastal regions that are hydraulically controlled. This study proposes a method to assess the origin of salinity using environmental tracers in porewater, like Cl and Br, combined with depositional facies associations detected in sediment cores. Such integrated approach was tested in a target area south of the Venice Lagoon (Italy), where groundwater salinization is triggered by multiple mechanisms due to the complexity of the hydro-geomorphological environment. Batch tests were performed on sediment core samples from boreholes to quantify major anions and total inorganic N. Cl and Br porewater concentrations coupled with sedimentary facies association provided insights into the origin of groundwater salinity from a variety of sources, including past and present seawater intrusion, agricultural leaching, and evaporites. The strengths and limitations of the integrated approach are discussed to provide a pathway for improving water resource management and planning measures to prevent groundwater salinization in coastal areas.
地下水盐渍化的成因可以是自然的，也可以是人为的，不过它往往是两者共同作用的结果，在受水力控制的低洼沿海地区尤其如此。本研究提出了一种利用孔隙水中的环境示踪剂（如氯和溴）结合沉积物岩芯中检测到的沉积相组合来评估盐度来源的方法。这种综合方法在意大利威尼斯泻湖以南的一个目标区域进行了测试，由于水文地貌环境的复杂性，该区域的地下水盐渍化是由多种机制引发的。对钻孔沉积物岩芯样本进行了批量测试，以量化主要阴离子和总无机氮。孔隙水中氯和溴的浓度与沉积相组合相结合，揭示了包括过去和现在的海水入侵、农业淋溶和蒸发岩在内的各种来源的地下水盐度的成因。讨论了综合方法的优点和局限性，为改进水资源管理和规划措施以防止沿海地区地下水盐渍化提供了一条途径。
