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《Journal of Jilin University(Earth Science Edition)》 2010-02
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2.5-D DC Electric Field Numerical Modeling Including Surface Topography Based on Coordinate Transformation Method

SUN Zhang-qing,SUN Jian-guo,ZHANG Dong-liangCollege of GeoExploration Science and Technology/ Laboratory for Integrated Geophysical Interpretation Theory of the Ministry for Land and Resources of China-Laboratory for Wave Theory and Imaging Technology,Jilin University,Changchun 130026,China  
Research for the distribution characteristics of apparent resistivity including surface topography is the basis of topographic correction.For the difficulty of dealing with the irregular boundary,the finite-difference method,a concise and efficient method,is seldom used to solve the surface topography problem.For the sake of solving this problem,we introduced a method to transform the surface topography into horizontal topography and that realizes a new numerical modeling method for 2.5-D DC electric field base on coordinate transformation and finite-difference method.We firstly transformed the basic equations and boundary conditions of DC electric field by coordinate transformation,and then did the numerical analysis in computation space by finite-difference method.Finally,we transformed the computation results from computation space to surface topography space by the same coordinate mapping.Accuracy analysis and numerical tests show that the new method is concise,the computation error congregates around the source and the average relative error is 1.39%.The computation results are also able to meet the distribution characteristics of DC electric field and apparent resistivity including surface topography.
【Fund】: 国家高技术研究发展计划“863”探索导向类课题(2006AA06Z109)
【CateGory Index】: P631.3
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