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首页> 外文期刊>Ground water >Geophysical and Hydrologic Studies of Lake Seepage Variability
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Geophysical and Hydrologic Studies of Lake Seepage Variability

机译：湖泊渗流变异的地球物理与水文研究

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摘要

Variations in lake seepage were studied along a 130 m shoreline of Mirror Lake NH. Seepage was downward from the lake to groundwater; rates measured from 28 seepage meters varied from 0 to -282 cm/d. Causes of this variation were investigated using electrical resistivity surveys and lakebed sediment characterization. Two-dimensional (2D) resistivity surveys showed a transition in lakebed sediments from outwash to till that correlated with high- and low-seepage zones, respectively. However, the 2D survey was not able to predict smaller scale variations within these facies. In the outwash, fast seepage was associated with permeability variations in a thin (2 cm) layer of sediments at the top of the lakebed. In the till, where seepage was slower than that in the outwash, a three-dimensional resistivity survey mapped a point of high seepage associated with heterogeneity (lower resistivity and likely higher permeability). Points of focused flow across the sediment-water interface are difficult to detect and can transmit a large percentage of total exchange. Using a series of electrical resistivity geophysical methods in combination with hydrologic data to locate heterogeneities that affect seepage rates can help guide seepage meter placement. Improving our understanding of the causes and types of heterogeneity in lake seepage will provide better data for lake budgets and prediction of mass transfer of solutes or contaminants between lakes and groundwater.
机译：在新罕布什尔州镜湖130 m海岸线上研究了湖泊渗漏的变化。从湖泊到地下水的渗漏是向下的。从28个渗漏仪测得的流速从0到-282 cm / d。使用电阻率调查和湖床沉积物表征研究了这种变化的原因。二维（2D）电阻率调查显示湖床沉积物从冲积到直到分别与高渗流区和低渗流区相关的过渡。但是，二维调查无法预测这些相中较小的尺度变化。在冲刷过程中，快速渗漏与湖床顶部薄（2 cm）沉积物中渗透率的变化有关。在渗流慢于冲刷的耕层中，三维电阻率调查显示了与非均质性相关的高渗点（较低的电阻率和可能较高的渗透率）。穿过沉积物-水界面的集中流点很难检测，并且可以传输总交换量的很大一部分。使用一系列电阻率地球物理方法结合水文数据来定位影响渗流速率的异质性，可以帮助指导渗流计的布置。增进我们对湖泊渗流非均质性的原因和类型的理解，将为湖泊预算和预测湖泊和地下水之间溶质或污染物的质量转移提供更好的数据。

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  • 来源
    《Ground water》 |2015年第6期|841-850|共10页
  • 作者

    Toran Laura; Nyquist Jonathan; Rosenberry Donald; Gagliano Michael; Mitchell Natasha; Mikochik James;

  • 作者单位

    Temple Univ, Dept Earth & Environm Sci, Philadelphia, PA 19122 USA;

    Temple Univ, Dept Earth & Environm Sci, Philadelphia, PA 19122 USA;

    US Geol Survey, Denver Fed Ctr, Denver, CO 80225 USA;

    Temple Univ, Dept Earth & Environm Sci, Philadelphia, PA 19122 USA;

    Temple Univ, Dept Earth & Environm Sci, Philadelphia, PA 19122 USA;

    Temple Univ, Dept Earth & Environm Sci, Philadelphia, PA 19122 USA;

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