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Modeling Transient Streaming Potentials in Falling-Head Permeameter Tests

机译：落头渗透仪测试中的瞬态流电势建模

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摘要

We present transient streaming potential data collected during falling-head permeameter tests performed on samples of two sands with different physical and chemical properties. The objective of the work is to estimate hydraulic conductivity (K) and the electrokinetic coupling coefficient (C_l) of the sand samples. A semi-empirical model based on the falling-head permeameter flow model and electrokinetic coupling is used to analyze the streaming potential data and to estimate K and C_l. The values of K estimated from head data are used to validate the streaming potential method. Estimates of K from streaming potential data closely match those obtained from the associated head data, with less than 10% deviation. The electrokinetic coupling coefficient was estimated from streaming potential vs. time and head data for both sands. The results indicate that, within limits of experimental error, the values of C_l estimated by the two methods are essentially the same. The results of this work demonstrate that a temporal record of the streaming potential response in falling-head permeameter tests can be used to estimate both K and C_l. They further indicate the potential for using transient streaming potential data as a proxy for hydraulic head in hydrogeology applications.
机译：我们介绍了在对具有不同物理和化学性质的两种砂的样品进行的落头渗透仪测试期间收集的瞬态流电势数据。这项工作的目的是估计砂样品的水力传导率（K）和电动耦合系数（C_1）。基于落头渗透仪流量模型和电动耦合的半经验模型用于分析流势数据并估计K和C_1。从头数据估计的K值用于验证流潜在方法。从潜在数据流中得出的K估计值与从关联头数据获得的估计值非常接近，偏差小于10％。电动偶合系数是根据两种砂的流势与时间和水头数据估算的。结果表明，在实验误差的范围内，两种方法估计的C_1值基本相同。这项工作的结果表明，落头渗透仪测试中流电势响应的时间记录可用于估计K和C_1。他们进一步指出了使用瞬态流势数据作为水文地质应用中水力压头代理的潜力。

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  • 来源
    《Ground water》 |2014年第4期|535-549|共15页
  • 作者

    Bwalya Malama; Andre Revil;

  • 作者单位

    Performance Assessment Department, Sandia National Laboratories, 4100 National Parks Highway, Carlsbad, NM 88220;

    Colorado School of Mines, Department of Geophysics, Golden, CO 80401 ,ISTerre, CNRS, UMR 5275, Universite de Savoie, Equipe Volcan, Le Bourget du Lac, France;

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