Experimental and numerical analysis of dielectric polarization effects in near‐surface earth materials in the 100 Hz–10 MHz frequency range: First interpretation paths

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Near Surface Geophysics Pub Date : 2024-05-27 DOI:10.1002/nsg.12302
A. Tabbagh, B. Souffaché, D. Jougnot, A. Maineult, F. Rejiba, P. M. Adler, C. Schamper, J. Thiesson, C. Finco, A. Mendieta, F. Rembert, R. Guérin, C. Camerlynck
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Abstract

SummaryThe recent developments of electromagnetic induction and electrostatic prospection devices dedicated to critical zone surveys in both rural and urban contexts necessitate improving the interpretation of electrical properties through complementary laboratory studies. In a first interpretation step, the various experimental results obtained in the 100 Hz–10 MHz frequency range can be empirically fitted by a simple six‐term formula. It allows the reproduction of the logarithmic decrease of the real component of the effective relative permittivity and its corresponding imaginary component, the part associated with the direct current conductivity, one Cole–Cole relaxation and the real and imaginary components of the high‐frequency relative permittivity. For elucidating physical phenomena contributing to both the logarithmic decrease and the observed Cole–Cole relaxation, we first consider the Maxwell–Wagner–Sillars polarization. Using the method of moments, we establish that this continuous medium approach can reproduce a large range of relaxation characteristics. At the microscopic scale, the possible role of the rotation of the water molecules bound to solid grains is then investigated. In this case, contrary to the Maxwell–Wagner–Sillars approach, the relaxation parameters do not depend on the external medium properties.
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对 100 Hz-10 MHz 频率范围内近表面地球材料中的介电极化效应进行实验和数值分析:首次解释路径
摘要最近开发的电磁感应和静电探测设备专门用于农村和城市的临界区勘测,因此有必要通过补充实验室研究来改进电特性的解释。在第一个解释步骤中,在 100 Hz-10 MHz 频率范围内获得的各种实验结果可以通过一个简单的六项公式进行经验拟合。它可以再现有效相对介电常数实分量的对数下降及其相应的虚分量、与直流电导有关的部分、一次科尔-科尔弛豫以及高频相对介电常数的实分量和虚分量。为了阐明导致对数下降和观测到的科尔-科尔弛豫的物理现象,我们首先考虑了麦克斯韦-瓦格纳-西拉尔斯极化。利用矩法,我们确定这种连续介质方法可以再现很大范围的弛豫特性。然后,在微观尺度上研究了与固体晶粒结合的水分子旋转的可能作用。在这种情况下,与 Maxwell-Wagner-Sillars 方法相反,弛豫参数并不依赖于外部介质特性。
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来源期刊
Near Surface Geophysics
Near Surface Geophysics 地学-地球化学与地球物理
CiteScore
3.60
自引率
12.50%
发文量
42
审稿时长
6-12 weeks
期刊介绍: Near Surface Geophysics is an international journal for the publication of research and development in geophysics applied to near surface. It places emphasis on geological, hydrogeological, geotechnical, environmental, engineering, mining, archaeological, agricultural and other applications of geophysics as well as physical soil and rock properties. Geophysical and geoscientific case histories with innovative use of geophysical techniques are welcome, which may include improvements on instrumentation, measurements, data acquisition and processing, modelling, inversion, interpretation, project management and multidisciplinary use. The papers should also be understandable to those who use geophysical data but are not necessarily geophysicists.
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