Modelling and analysis study of electromagnetic field distribution around submarine cable
Tuan-Jie GAN1, Jian-Ping CHEN1(), Xi YANG1, Qing-Dong ZHOU1, Liang ZENG2
1. Jiangmen Power Supply Bureau, Guangdong Electrifc Network Liability Co., Ltd., Jiangmen 510630, China 2. Guangdong Electric Power Design Institute Liability Co., Ltd., China Energy Resource Construction Group, Guangzhou 510663, China
The detection and identification technology in the maintenance and construction of submarine cables has become a very important research content. In this paper, a 2.5-dimensional high-precision finite element numerical simulation algorithm of the frequency domain CSEM method was used to simulate and analyze the submarine cable model. Based on the horizontal terrain and undulating terrain submarine cable models, this study focused on the simulation and analysis of the characteristics of the electromagnetic field distribution with the changing of seawater layer thickness and the submarine interface. Numerical examples show that the magnetic field component Hy is very sensitive to the thickness of the seawater layer. When the thickness is changed by 0.2m, the Hy error anomaly amplitude can reach 5%, thus demonstrating that the CSEM theory is feasible for detection and identification of submarine cables.
甘团杰, 陈剑平, 杨玺, 周庆东, 曾亮. 海底电缆电磁场分布模拟与分析[J]. 物探与化探, 2020, 44(3): 550-558.
Tuan-Jie GAN, Jian-Ping CHEN, Xi YANG, Qing-Dong ZHOU, Liang ZENG. Modelling and analysis study of electromagnetic field distribution around submarine cable. Geophysical and Geochemical Exploration, 2020, 44(3): 550-558.
Li J. Analysis on method and application of submarine cable detection[J]. Journal of Waterway and Harbor, 2018,178(03):123-127.
Cox C. Electromagnetic induction in the oceans and inferences on the constitution of the earth[J]. Geophys Surv, 1980,4(1-2):137-156.
Mitsuhata Y. 2-D electromagnetic modeling by finite-element method with a dipole-dipole source and topography[J]. Geophysics, 2000,65(2):465-475.
Li Y G, Dai S K. Finite element modelling of marines controlled-source electromagnetic responses in two-dimensional dipping anisotropic conductivity structures[J]. Geophysical Journal International, 2011,185(2):622-636.
Xue D C, Dai S K. Absorbing boundary condition for simulation 2.5-D electromagnetic sounding in frequency domain by finite element method[J]. Journal of China University of Petroleum:Edition of Natural Sciences, 2008,32(6):57-61.
Key K, Ovall J. A parallel goal-oriented adaptive finite element method for 2.5-D electromagnetic modelling[J]. Geophysical Journal International, 2011,186(1):137-154.