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首页> 外文期刊>Environmental Science & Technology >Hydrogeochemical Tool to Identify Salinization or Freshening of Coastal Aquifers Determined from Combined Field Work. Experiments, and Modeling
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Hydrogeochemical Tool to Identify Salinization or Freshening of Coastal Aquifers Determined from Combined Field Work. Experiments, and Modeling

机译：用于确定由联合野外工作确定的沿海含水层盐碱化或新鲜化的水文地球化学工具。实验与建模

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摘要

This study proposes a hydrogeochemical tool to distinguish between salinization and freshening events of a coastal aquifer and quantifies their effect on groundwater characteristics. This is based on the chemical composition of the fresh-saline water interlace (FSI) determined from combined field work, column experiments with the same sediments, and modeling. The experimental results were modeled using the PHREEQC code and were compared to field data from the coastal aquifer of Israel. The decrease in the isotopic composition of the dissolved inorganic carbon (δ~(13)C_(DIC)) of the saline water indicates that, during seawater intrusion and coastal salinization, oxidation of organic carbon occurs. However, the main process operating during salinization or freshening events in coastal aquifers is cation exchange. The relative changes in Ca~(2+), Sr~(2+), and K~+ concentrations during salinization and freshening events are used as a reliable tool for characterizing the status of a coastal aquifer. The field data suggest that coastal aquifers may switch from freshening to salinization on a seasonal time scale.
机译：这项研究提出了一种水文地球化学工具，以区分沿海含水层的盐渍化和新鲜事件，并量化它们对地下水特征的影响。这是基于通过结合野外工作，使用相同沉积物进行柱实验和建模而确定的淡盐水交错层（FSI）的化学组成。使用PHREEQC代码对实验结果进行了建模，并与来自以色列沿海含水层的现场数据进行了比较。盐水中溶解的无机碳（δ〜（13）C_（DIC））的同位素组成减少表明，在海水入侵和沿海盐碱化过程中，有机碳发生了氧化。但是，在沿海含水层盐碱化或淡化过程中运行的主要过程是阳离子交换。盐渍化和淡水事件期间Ca〜（2 +），Sr〜（2+）和K〜+浓度的相对变化被用作表征沿海含水层状况的可靠工具。现场数据表明，沿海含水层可能会在一个季节性的时间尺度上从新鲜变为盐碱化。

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  • 来源
    《Environmental Science & Technology》 |2010年第11期|P.4096-4102|共7页
  • 作者

    AMOS RUSSAK; ORIT SIVAN;

  • 作者单位

    Department of Geological and Environmental Sciences, Ben Gurion University, Beer Sheva 84105, Israel Geological Survey of Israel, Jerusalem 95501, Israel;

    rnDepartment of Geological and Environmental Sciences, Ben Gurion University, Beer Sheva 84105, Israel;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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