QS-FDTD Modeling of Dispersive Superparamagnetic Soils for Time-Domain Electromagnetic Method

Talha Saydam;Serkan Aksoy
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Abstract

Time-domain electromagnetic (TDEM) method is extensively utilized in geophysical surveys for detection of groundwater and mineral deposits. However, the dispersive effect of superparamagnetic (SPM) soils significantly impacts performance of these systems. In modeling of the SPM soils, the distribution of magnetic particles in the soil is generally accounted with a log-uniform model in which time-relaxation constants are distributed uniformly in a finite time range. In this study, the effect of the SPM soils on the TDEM system performance is analyzed by a quasi-static finite-difference time-domain (QS-FDTD) method. The treatment of the magnetic dispersive SPM soil of the log-uniform model is performed by an auxiliary differential equation (ADE) technique (without any convolution) in the QS-FDTD method. The numerical results are validated for a homogeneous SPM half-space problem and a problem of a thin SPM upper layer with a buried conductive body. Afterward, a dispersive complex problem is also solved. The obtained results can be used to evaluate the TDEM performance for the complex magnetic dispersive problems.
色散超顺磁性土的时域电磁法QS-FDTD建模
时域电磁法在地球物理勘探中广泛应用于地下水和矿床的探测。然而,超顺磁(SPM)土的色散效应显著影响了这些系统的性能。在SPM土的模拟中,通常采用对数均匀模型来考虑土壤中磁性颗粒的分布,该模型中时间松弛常数在有限时间范围内均匀分布。本文采用准静态时域有限差分(QS-FDTD)方法分析了SPM土对TDEM系统性能的影响。采用QS-FDTD方法中的辅助微分方程(ADE)技术(不进行任何卷积)处理对数均匀模型的磁色散SPM土。对均质SPM半空间问题和带导电体的薄SPM上层问题的数值结果进行了验证。然后,还解决了一个分散的复杂问题。所得结果可用于评价TDEM在复杂磁色散问题中的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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