干旱区生态环境知识资源中心(Arid): 2. 5-D forward modeling of the frequency-domain ground-airborne electromagnetic response in areas with topographic relief

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DOI	10.6038/cjg2020N0182
	2. 5-D forward modeling of the frequency-domain ground-airborne electromagnetic response in areas with topographic relief
	Zhang Ming; Farquharson, Colin G.; Liu ChangSheng
通讯作者	Liu, CS (corresponding author), Jilin Univ, Coll Instrumentat & Elect Engn, Changchun 130061, Peoples R China. ; Liu, CS (corresponding author), Minist Educ, Key Lab Geoexplorat Instrumentat, Changchun 130061, Peoples R China.
来源期刊	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN	0001-5733
出版年	2021
卷号	64 期号:1 页码:327-342
英文摘要	Ground-airborne frequency-domain electromagnetic method is an effective and efficient geophysical prospecting method. It usually places the controlled source on the ground and measure the electromagnetic field in the air. This method can achieve fast measurement in large scale, is especially suitable for resource exploration in rugged mountains, deserts, swamps, sea-land interaction zones and other areas with complex topography relief. However, in these areas, the topography relief is serious, so the study of the topographic effect on ground-airborne electromagnetic response is meaningful. In this paper, the 2. 5D frequency domain ground-airborne electromagnetic response of topography earth model was calculated based on the finite element method and the response characteristic is analyzed. Fourier transform was applied to the Maxwell's equations to transform a 2. 5D problem into a 2D problem, and then the discrete finite element equation was deduced using the Galerkin weighted residual method. The surveyed region is subdivided into many arbitrary quadrilateral elements with different sizes, the ones region near the source and the target have smaller size to ensure the accuracy of numerical calculation, the ones away from the target region have bigger size to simulate infinite boundary and reduce the requirements for computing resource. Interpolation is conducted in the element to transform the finite element equations to the linear system of equations. Using the total field algorithm, the pseudo-delta function with a certain area is employed to approximate the distribution of the source current, the source terms are approximately distributed at 25 nodes centered on the electric dipole source. By solving the equation, the solution of electromagnetic field in wavenumber domain was obtained, then the solution of electromagnetic field in spatial domain can be calculated by the Invers Fourier Transformation. The accuracy of our algorithm was verified by the comparison of our 2. 5D forward modeling results and the analytical results. We also compared the electromagnetic field response characteristics measured in the air and on the ground.
英文关键词	Ground-airborne electromagnetic method 2. 5D Forward modeling Topographic surface Total field algorithm
类型	Article
语种	中文
收录类别	SCI-E
WOS记录号	WOS:000604835800024
WOS关键词	SYSTEM
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/347795
作者单位	[Zhang Ming; Liu ChangSheng] Jilin Univ, Coll Instrumentat & Elect Engn, Changchun 130061, Peoples R China; [Zhang Ming; Liu ChangSheng] Minist Educ, Key Lab Geoexplorat Instrumentat, Changchun 130061, Peoples R China; [Zhang Ming; Farquharson, Colin G.] Mem Univ Newfoundland, Dept Earth Sci, St John, NF A1B 3S7, Canada
推荐引用方式 GB/T 7714	Zhang Ming,Farquharson, Colin G.,Liu ChangSheng. 2. 5-D forward modeling of the frequency-domain ground-airborne electromagnetic response in areas with topographic relief[J],2021,64(1):327-342.
APA	Zhang Ming,Farquharson, Colin G.,&Liu ChangSheng.(2021).2. 5-D forward modeling of the frequency-domain ground-airborne electromagnetic response in areas with topographic relief.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,64(1),327-342.
MLA	Zhang Ming,et al."2. 5-D forward modeling of the frequency-domain ground-airborne electromagnetic response in areas with topographic relief".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 64.1(2021):327-342.