桂林理工大学学报Issue(1)：30-38,9.DOI:10.3969/j.issn.1674-9057.2014.01.005
复杂地形电导率线性变化二维大地电磁有限单元法正演模拟
Two dimension magnetotelluric FEM modeling of complex topography with linear variable conductivity in triangle element
摘要
Abstract
In order to simulate complex topography and geological structure,triangle element is used to do the grid mesh in two dimension magnetotelluric FEM (Finite Element Method)forward modeling.Conductivity is linear variable in each triangle element,which accords better with field geological condition.An easy mesh method for upright discontinuity topography is constructed.The FEM coefficient matrixes of TE (Tansverse E-lectric)mode are deduced and the coefficient matrixes of TM (Tansverse Magnetic)mode are calculated by Gauss integral.Quadratic Lagrange interpolation is used to calculate the vertical derivative to calculate auxiliary field.In order to test the forward modeling method,the apparent resistivity and phase of one and two dimen-sion models are calculated.The relative square deviation of FEM and analytical results are less than 0.17%. A model of discontinuity topography is also simulated in this paper.关键词
大地电磁/二维/垂直断面地形/电导率线性变化/有限单元法/正演Key words
magnetotelluric/two dimension/upright discontinuity topography/linear variable conductivity/finite element method/forward modeling分类
天文与地球科学引用本文复制引用
欧东新,韦者良..复杂地形电导率线性变化二维大地电磁有限单元法正演模拟[J].桂林理工大学学报,2014,(1):30-38,9.基金项目
广西自然科学基金项目（0848021）；广西地质工程中心重点实验室开放基金项目 （）
