Comparison of terrain corrections based on the point source and line source DC methods
In the direct current (DC) exploration method, topographic relief distorts the apparent resistivity curve. To eliminate effects of terrain fluctuations, two undulating terrains comprising valleys and ridges were investigated in the present study. An unstructured triangular mesh method in which the w...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-09-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.1004442/full |
| _version_ | 1811265565631709184 |
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| author | Haijun Xie Haijun Xie Lu Li Zhiqiang Li Jingrui Li Gang Li Wanlu Li |
| author_facet | Haijun Xie Haijun Xie Lu Li Zhiqiang Li Jingrui Li Gang Li Wanlu Li |
| author_sort | Haijun Xie |
| collection | DOAJ |
| description | In the direct current (DC) exploration method, topographic relief distorts the apparent resistivity curve. To eliminate effects of terrain fluctuations, two undulating terrains comprising valleys and ridges were investigated in the present study. An unstructured triangular mesh method in which the wave number k and its coefficient g were obtained using the integral method and the point and line source surveys were conducted using comsol multiphysics. Current sources were evaluated using two-dimensional (2-D) finite element forward modeling, whereas terrain correction was performed using both the comparison and conformal transformation methods. The results reveal comparable theoretical curves for the line and point sources, but quantitative characteristics of the curves differ. The comparison method is suitable for both curves, whereas the conformal transformation method is only applicable to the line source. Even though electric fields associated with the line and point sources differ, the comparison method that is based on the electrical cross-section curve of the line source and the electric profile curve of the point source remains effective. |
| first_indexed | 2024-04-12T20:25:53Z |
| format | Article |
| id | doaj.art-698673bfa78a487d9abd8f53530d2f46 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-12T20:25:53Z |
| publishDate | 2022-09-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-698673bfa78a487d9abd8f53530d2f462022-12-22T03:17:52ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-09-011010.3389/feart.2022.10044421004442Comparison of terrain corrections based on the point source and line source DC methodsHaijun Xie0Haijun Xie1Lu Li2Zhiqiang Li3Jingrui Li4Gang Li5Wanlu Li6College of Geology and Environment, Xi’an University of Science and Technology, Xi’an, ChinaCoal Resources Exploration and Comprehensive Utilization, Xi’an, ChinaCollege of Geology and Environment, Xi’an University of Science and Technology, Xi’an, ChinaXi’an Research Institute China Coal Technology & Engineering Group Corp, Xi’an, ChinaShaanxi Coal Chemical Industry Technology Research Institute Co., Ltd, Xi’an, ChinaCollege of Geology and Environment, Xi’an University of Science and Technology, Xi’an, ChinaCollege of Geology and Environment, Xi’an University of Science and Technology, Xi’an, ChinaIn the direct current (DC) exploration method, topographic relief distorts the apparent resistivity curve. To eliminate effects of terrain fluctuations, two undulating terrains comprising valleys and ridges were investigated in the present study. An unstructured triangular mesh method in which the wave number k and its coefficient g were obtained using the integral method and the point and line source surveys were conducted using comsol multiphysics. Current sources were evaluated using two-dimensional (2-D) finite element forward modeling, whereas terrain correction was performed using both the comparison and conformal transformation methods. The results reveal comparable theoretical curves for the line and point sources, but quantitative characteristics of the curves differ. The comparison method is suitable for both curves, whereas the conformal transformation method is only applicable to the line source. Even though electric fields associated with the line and point sources differ, the comparison method that is based on the electrical cross-section curve of the line source and the electric profile curve of the point source remains effective.https://www.frontiersin.org/articles/10.3389/feart.2022.1004442/fullDC methodfinite elementcomparison methodconformal transformationterrain correction |
| spellingShingle | Haijun Xie Haijun Xie Lu Li Zhiqiang Li Jingrui Li Gang Li Wanlu Li Comparison of terrain corrections based on the point source and line source DC methods Frontiers in Earth Science DC method finite element comparison method conformal transformation terrain correction |
| title | Comparison of terrain corrections based on the point source and line source DC methods |
| title_full | Comparison of terrain corrections based on the point source and line source DC methods |
| title_fullStr | Comparison of terrain corrections based on the point source and line source DC methods |
| title_full_unstemmed | Comparison of terrain corrections based on the point source and line source DC methods |
| title_short | Comparison of terrain corrections based on the point source and line source DC methods |
| title_sort | comparison of terrain corrections based on the point source and line source dc methods |
| topic | DC method finite element comparison method conformal transformation terrain correction |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.1004442/full |
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