Estimation of longitudinal dispersivity in a porous medium using self-potential signals
Estimation of longitudinal dispersivity in a porous medium using self-potential signals
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DOI：
10.1016/j.jhydrol.2013.09.046
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发表时间：
2013-11
影响因子：
6.4
通讯作者：
S. Straface;M. D. Biase
中科院分区：
文献类型：
--
作者：
S. Straface;M. D. Biase
本文介绍了几种在示踪试验中通过测量输出流体浓度和插入砂中的电极中的自电位信号来推断砂柱中纵向弥散度的方法。这些信号已被用来通过耦合和非耦合水文地球物理方法来获得纵向弥散度的估计。第一种方法同时使用电流密度和溶质质量连续性方程：分散性直接由自电位信号调节。相反，非耦合的方法，首先转换自电位信号到浓度值使用的普朗克亨德森方程，然后估计的色散仅使用的传输equation.Longitudinal色散计算使用自电位信号通过这两种方法得到的比较与使用的浓度来自电导仪上的列的顶部。结果表明，水文地球物理方法的优越性。
This paper presents several approaches to deduce the longitudinal dispersivity in a sand column during experiments oftracer tests, by measuring the output fluid concentration and the self-potential signals in the electrodes inserted into the sand.These signals have been used to obtain an estimate of longitudinal dispersivity through a coupled and an uncoupled hydrogeophysical approach. The first approach uses electrical current density and solute mass continuity equations simultaneously: the dispersivity is conditioned directly by the self-potential signals. Instead, the uncoupled approach firstly converts self-potential signals into concentration values using the Planck-Henderson equation and then estimates the dispersivity using only the transport equation.Longitudinal dispersivities calculated using self-potential signals by means of these two approaches were compared with those obtained using the concentration derived from a conductometer on the top of the column. The results show the goodness of the hydrogeophysical approaches.