论文标题
电磁反演的快速准确的数值方法
A fast and accurate numerical approach for electromagnetic inversion
论文作者
论文摘要
本文介绍了麦克斯韦方程的解决方案，以在分层地球的情况下对电磁场进行建模。基于反射项的分裂，通过新颖的方法近似参与溶液的积分。还考虑了从一组建模磁场成分的未知地下电导率分布计算的逆问题。基于线条和全球搜索方法，应用了两种优化算法，并提出了一种新的最小化方法。考虑到水平共面（HCP）和垂直（PRP）磁性偶极构型，对地面表面进行了几项EM调查。用于研究河流完整性的数值实验允许估计与此类研究相关的错误，并确认该技术的可靠性。
This paper deals with the solution of Maxwell's equations to model the electromagnetic fields in the case of a layered earth. The integrals involved in the solution are approximated by means of a novel approach based on the splitting of the reflection term. The inverse problem, consisting in the computation of the unknown underground conductivity distribution from a set of modeled magnetic field components, is also considered. Two optimization algorithms are applied, based on line- and global-search methods, and a new minimization approach is presented. Several EM surveys from the ground surface are simulated, considering the horizontal coplanar (HCP) and perpendicular (PRP) magnetic dipolar configurations. The numerical experiments, carried out for the study of river-levees integrity, allowed to estimate the errors associated to these kind of investigations, and confirm the reliability of the technique.
