Graphical Representation and Explanation of the Conductivity Tensor of Anisotropic Media

Graphical Representation and Explanation of the Conductivity Tensor of Anisotropic Media
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各向异性介质电导率张量的图形表示和解释

DOI:
10.1007/s10712-019-09581-5
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发表时间:
2020-01
影响因子:
4.6
通讯作者:
Lin‑jiang Qin
Lin‑jiang Qin
中科院分区:
地球科学1区
文献类型:
--
作者:
Chang‑fu Yang;Lin‑jiang Qin

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电各向异性是地球材料的一种性质,可以通过电磁地球物理方法(如大地电磁法)进行研究。它由电导率随取向而变化组成,并在数学上由电导率张量表征。为了更好地理解电导率张量,为定量分析各向异性结构的电导率张量提供更有效的工具,提出了三种对称张量的图示方法:椭球、莫尔圆和几何形式.椭圆体表示法可以用来表示不同方向上各向异性的强度。莫尔圆提供了张量作为坐标系旋转的函数的图形表示。对于几何形式,一维(1-D),二维(2-D)和三维(3-D)片模型与给定的参数(组成棱镜的尺寸和折射率),宏观各向异性电导率可以使用封闭形式的数学公式计算。这三种图形表示在揭示电导率张量的信息方面具有不同的能力。四个合成的例子,涉及单轴或双轴各向异性导电性结构的主轴坐标系中检查调查的图形显示的优点和缺点。
Electrical anisotropy is a property of the Earth materials that can be studied through electromagnetic geophysical methods, such as magnetotellurics. It consists of the electrical conductivity changing with the orientation and being mathematically characterized by the conductivity tensor. In order to better understand the conductivity tensor and provide more effective tools for quantitatively analyzing the conductivity tensor of anisotropic structures, three graphical representations for symmetric tensors using ellipsoids, Mohr circles and geometric forms are presented. The ellipsoid representation can be applied to indicate the strength of the anisotropy in different directions. The Mohr circle provides a graphic representation of a tensor as a function of the rotation of the coordinate system. For the geometric forms, one-dimensional (1-D), two-dimensional (2-D) and three-dimensional (3-D) sheet models with given parameters (sizes and resistivities of the constituent prisms), the macroscopic anisotropic conductivity may be calculated using the closed-form mathematical formulas. These three graphical representations have different abilities for revealing information on the conductivity tensor. Four synthetic examples involving uniaxial or biaxial anisotropic conductivity structures are examined in the principal axis coordinate system to investigate the advantages and disadvantages of the graphical displays.
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