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- W1978035118 abstract "One numerical method, using boundary element to model an electromagnetic field induced by an artificial source in frequency domain with 3-D topography, is put forward in this paper. In this method, using vector integral theory and boundary conditions of the electromagnetic field, the boundary problem of two electromagnetic fields in the upper space (air) and lower space (earth medium) is transformed into two vector integral equations just related to the topography: one magnetic equation for computing the magnetic field and one electric equation for computing the electric field. The topography integral is then decomposed into a series of integrals in a triangular element. For the integral in the triangular element, the electromagnetic field in the triangular element is the stack of the electromagnetic field in the unlimited air space plus the earth medium response which is supposed a constant, making the computation simple, convenient and highly accurate. Using decomposition and computation, each vector integral equation can be calculated by solving three linear equations which are related to three Cartesian space coordinate axes, respectively. The matrix of these linear equations is diagonally dominant, and can be solved by SSOR. The modeling tests for the vertical magnetic dipole source indicate that the method makes the calculations simple with a high accuracy and that the vertical magnetic response is distorted by the relief of the topography, increasing at a point above the source and decreasing at a point below the source due to the topography effect." @default.
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- W1978035118 date "2005-09-01" @default.
- W1978035118 modified "2023-09-23" @default.
- W1978035118 title "Boundary Element Modeling for EM of Artificial Source in Frequency Domain With 3-D Topography" @default.
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- W1978035118 doi "https://doi.org/10.1002/cjg2.775" @default.
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