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首页> 外文期刊>Water resources research >Vertical groundwater storage properties and changes in confinement determined using hydraulic head response to atmospheric tides
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Vertical groundwater storage properties and changes in confinement determined using hydraulic head response to atmospheric tides

机译：利用水头对大气潮汐的响应确定地下水的垂直储水性质和围限变化

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摘要

Accurate determination of groundwater state of confinement and compressible storage properties at vertical resolution over depth is notoriously difficult. We use the hydraulic head response to atmospheric tides at 2 cpd frequency as a tracer to quantify barometric efficiency (BE) and specific storage (Ss) over depth. Records of synthesized Earth tides, atmospheric pressure, and hydraulic heads measured in nine piezometers completed at depths between 5 and 55 m into unconsolidated smectitic clay and silt, sand and gravel were examined in the frequency domain. The barometric efficiency increased over depth from similar to 0.05 in silty clay to similar to 0.15 in sands and gravels. BE for silty clay was confirmed by calculating the loading efficiency as 0.95 using rainfall at the surface. Specific storage was calculated using effective rather than total moisture. The differences in phase between atmospheric pressure and hydraulic heads at 2 cpd were similar to 1808 below 10 m indicating confined conditions despite the low BE. Heads in the sediment above a fine sand and silt layer at 12 m exhibited a time variable phase difference between 08 and 1808 indicating varying confinement. Our results illustrate that the atmospheric tide at 2 cpd is a powerful natural tracer for quantifying groundwater state of confinement and compressible storage properties in layered formations from hydraulic heads and atmospheric pressure records without the need for externally induced hydraulic stress. This approach could significantly improve the development of conceptual hydrogeological model used for groundwater resource development and management.
机译：众所周知，在垂直分辨率范围内准确确定地下水的封闭状态和可压缩储量是非常困难的。我们使用液压头在2 cpd频率下对大气潮汐的响应作为示踪剂来量化整个深度的气压效率（BE）和比存储（Ss）。在频域中，检查了在5到55 m深度完成的9个压强计中测得的合成地球潮汐，大气压力和水头的记录，这些深度在未固结的近粘土，粉砂，沙子和砾石中。随着深度的增加，气压效率从粉质粘土中的约0.05增加到砂石中的0.15。粉尘黏土的BE值是通过使用地表降雨计算得出的加载效率为0.95来确定的。使用有效水分而不是总水分来计算比容。大气压和水压头在2 cpd时的相差类似于10 m以下的1808，尽管BE较低，但表明条件受限。在12 m处的细沙和粉砂层上方的沉积物中，水头表现出08到1808年之间的时变相位差，表明了封闭的变化。我们的结果表明，2 cpd的大气潮汐是一种强大的自然示踪剂，可用于量化水力压头和大气压力记录中层状地层中的约束和可压缩存储状态的地下水状态，而无需外部引起的水力应力。这种方法可以大大改善用于地下水资源开发和管理的概念性水文地质模型的开发。

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  • 来源
    《Water resources research》 |2017年第4期|2983-2997|共15页
  • 作者

    Acworth R. Ian; Rau Gabriel C.; Halloran Landon J. S.; Timms Wendy A.;

  • 作者单位

    UNSW Australia, Connected Waters Initiat Res Ctr, Sch Civil & Environm Engn, Sydney, NSW, Australia|UNSW Australia, Water Res Lab, Sch Civil & Environm Engn, Manly Vale, NSW, Australia;

    UNSW Australia, Connected Waters Initiat Res Ctr, Sch Civil & Environm Engn, Sydney, NSW, Australia|UNSW Australia, Water Res Lab, Sch Civil & Environm Engn, Manly Vale, NSW, Australia;

    UNSW Australia, Connected Waters Initiat Res Ctr, Sch Civil & Environm Engn, Sydney, NSW, Australia|UNSW Australia, Water Res Lab, Sch Civil & Environm Engn, Manly Vale, NSW, Australia;

    UNSW Australia, Connected Waters Initiat Res Ctr, Sch Civil & Environm Engn, Sydney, NSW, Australia|UNSW Australia, Sch Min Engn, Sydney, NSW, Australia;

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  • 正文语种 eng
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  • 关键词

    hydrology; publications; interdisciplinary; network; humanistic;

    机译：水文学;出版物;跨学科;网络;人文;

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