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| 2.5D DIRECT CURRENT RESISTIVITY ADAPTIVE FINITE-ELEMENT NUMERICAL MODELING BASED ON DUAL WEIGHTED POSTERIORI ERROR ESTIMATION |
| YAN Bo, LIU Ying, YE Yi-xin |
| Key Laboratory for Submarine Science and Exploration Technology of Ministry of Education, Ocean University of China, Qingdao 266100, China |
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Abstract 2.5D DC resistivity modeling was realized by adaptive finite-element numerical simulation algorithm. This algorithm uses unstructured triangular element that is easy to simulate complex topography and inclined interface to subdivide mesh, and utilizes dual weighted posteriori error estimation guide mesh refining process. In the instance model analysis, the authors calculated the DC resistivity response of the layered model and the vertical dike model, which were compared with their analytical solutions respectively. The results show that the numerical solution for this algorithm has high accuracy,and the relative error of the numerical solution is less than 5 percent. Finally, the authors calculated 2.5D geoelectric model apparent resistivity anomaly of undulate topography and corrected the undulate topography by using the comparative method. The contrast between topographic correction results and level terrain results show that the comparative method is effective in eliminating the terrain effect and giving prominence to local geological anomalies.
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Received: 17 December 2012
Published: 10 February 2014
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