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首页> 外文期刊>Ground water >Investigating Groundwater Flow Between Edwards and Trinity Aquifers in Central Texas
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Investigating Groundwater Flow Between Edwards and Trinity Aquifers in Central Texas

机译：调查德克萨斯州中部爱德华兹和三位一体含水层之间的地下水流

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摘要

Understanding the nature of communication between aquifers can be challenging when using traditional physical and geochemical groundwater sampling approaches. This study uses two multiport wells completed within Edwards and Trinity aquifers in central Texas to determine the degree of groundwater inter-flow between adjacent aquifers. Potentiometric surfaces, hydraulic conductivities, and groundwater major ion concentrations and Sr isotope values were measured from multiple zones within three hydrostratigraphic units (Edwards and Upper and Middle Trinity aquifers). Physical and geochemical data from the multiport wells were combined with historical measurements of groundwater levels and geochemical compositions from the region to characterize groundwater flow and identify controls on the geochemical compositions of the Edwards and Trinity aquifers. Our results suggest that vertical groundwater flow between Edwards and Middle Trinity aquifers is likely limited by low permeability, evaporite-rich units within the Upper and Middle Trinity. Potentiometric surface levels in both aquifers vary with changes in wet vs. dry conditions, indicating that recharge to both aquifers occurs through distinct recharge areas. Geochemical compositions in the Edwards, Upper, and Middle Trinity aquifers are distinct and likely reflect groundwater interaction with different lithologies (e.g., carbonates, evaporites, and siliceous sediments) as opposed to mixing of groundwater between the aquifers. These results have implications for the management of these aquifers as they indicate that, under current conditions, pumping of either aquifer will likely not induce vertical cross-formational flow between the aquifers. Inter-flow between the Trinity and the Edwards aquifers, however, should be reevaluated as pumping patterns and hydrogeologic conditions change.
机译：当使用传统的物理和地球化学地下水采样方法时，了解含水层之间的通信性质可能是一个挑战。这项研究使用了德克萨斯州中部的Edwards和Trinity含水层内完工的两口多口井来确定相邻含水层之间的地下水互流程度。在三个水文地层单位（爱德华兹和上三叠纪中层含水层）内的多个区域中测量了电位计表面，水力传导率以及地下水中的主要离子浓度和Sr同位素值。将多口井的物理和地球化学数据与该地区地下水位和地球化学成分的历史测量结果结合起来，以表征地下水流量并确定对Edwards和Trinity含水层地球化学成分的控制。我们的结果表明，爱德华兹和中三位一体含水层之间的垂直地下水流动可能受到上，中三位一体低渗透性，富蒸发岩的单元的限制。两种含水层中的电位表面水平都随干湿条件的变化而变化，这表明两种含水层的补给是通过不同的补给区进行的。爱德华兹，上三叠纪和中三叠纪含水层中的地球化学成分是不同的，并且可能反映了地下水与不同岩性（例如碳酸盐，蒸发岩和硅质沉积物）的相互作用，而不是含水层之间的地下水混合。这些结果对这些含水层的管理具有影响，因为它们表明，在当前条件下，任何一个含水层的泵送都可能不会在含水层之间引起垂直的横向流动。但是，随着抽水方式和水文地质条件的变化，应重新评估三位一体和爱德华兹含水层之间的水流。

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  • 来源
    《Ground water》 |2014年第4期|624-639|共16页
  • 作者

    C.I. Wong; J.S. Kromann; B.B. Hunt; B.A. Smith; J.L. Banner;

  • 作者单位

    Geological Sciences, The University of Texas at Austin, University Station C1100, Austin, TX 78712;

    Geological Sciences, The University of Texas at Austin, University Station C1100, Austin, TX 78712;

    Geological Sciences, The University of Texas at Austin, University Station C1100, Austin, TX 78712;

    Geological Sciences, The University of Texas at Austin, University Station C1100, Austin, TX 78712;

    Geological Sciences, The University of Texas at Austin, University Station C1100, Austin, TX 78712;

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