FEM USING ADAPTIVE TOPOGRAPHY IN 2D MT FORWARD MODELING

doi:10.3969/j.issn.0253－4967.2010.03.004

SEISMOLOGY AND GEOLOGY ›› 2010, Vol. 32 ›› Issue (3): 382-391.DOI: 10.3969/j.issn.0253－4967.2010.03.004

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FEM USING ADAPTIVE TOPOGRAPHY IN 2D MT FORWARD MODELING

LIU Yun, WANG Xu-ben

Department of Information and Engineering, Chengdu University of Technology, Chengdu 610059, China

Received:2010-01-05 Revised:2010-07-05 Online:2010-09-30 Published:2011-01-14

大地电磁二维自适应地形有限元正演模拟

刘云, 王绪本

成都理工大学信息工程学院, 成都, 610059

作者简介:刘云,男,1973年生,现为成都理工大学在读博士研究生,主要研究方向为地球物理电磁法数值模拟与反演成像,电话:15884448871,E-mail:liuyun0077@163.com.
基金资助:
国家863滚动课题“起伏地形二三维电磁法正反演解释工作站”(2006AA06Z110)资助

Abstract

Abstract: Complex terrain causes great MT noise.This paper puts forward a modeling technique of FEM using adaptive topography and quadratic element based on studies of some scholars.This technique can model all kinds of complicated terrain and geoelectric bodies preferably.The numeric modeling,calculation of the auxiliary field and definition of resistivity are deduced by electromagnetic equations.Lastly,several examples show the method is rapid,effective and of high accuracy.

Key words: MT, adaptive topography, quadrangle grid, FEM

摘要： 复杂地形对大地电磁测深法(MT)的影响非常大。文中在吸收和修正前人工作基础上,提出了一种自适应地形四边形网格剖分、单元内电磁场双二次插值数值模拟方法,能更好地模拟出复杂地形和场值分布,并推导出复杂地形条件下有限元数值模拟算法、单元辅助场的计算和TM模式视电阻率的局部定义法。模型计算表明,该数值模拟方法计算速度快,有较高的计算精度,能很好地模拟MT复杂地形影响和异常体影响。

关键词: 大地电磁测深, 自适应地形, 四边形网格, 有限元

CLC Number:

P631

LIU Yun, WANG Xu-ben. FEM USING ADAPTIVE TOPOGRAPHY IN 2D MT FORWARD MODELING[J]. SEISMOLOGY AND GEOLOGY, 2010, 32(3): 382-391.

刘云, 王绪本. 大地电磁二维自适应地形有限元正演模拟[J]. 地震地质, 2010, 32(3): 382-391.

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FEM USING ADAPTIVE TOPOGRAPHY IN 2D MT FORWARD MODELING

大地电磁二维自适应地形有限元正演模拟

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