海底电缆电磁场分布模拟与分析

doi:10.11720/wtyht.2020.1410

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Abstract

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 H_y is very sensitive to the thickness of the seawater layer. When the thickness is changed by 0.2m, the H_y error anomaly amplitude can reach 5%, thus demonstrating that the CSEM theory is feasible for detection and identification of submarine cables.

Key words： ocean exploration electromagnetic field submarine cable numerical simulation controlled source electromagnetic method finite element numerical simulation

Received: 26 August 2019 Published: 24 June 2020

P631

Corresponding Authors: Jian-Ping CHEN E-mail: jmchenjianping@126.com

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	Tuan-Jie GAN
	Jian-Ping CHEN
	Xi YANG
	Qing-Dong ZHOU
	Liang ZENG

Cite this article:

Tuan-Jie GAN,Jian-Ping CHEN,Xi YANG, et al. Modelling and analysis study of electromagnetic field distribution around submarine cable[J]. Geophysical and Geochemical Exploration, 2020, 44(3): 550-558.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1410 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I3/550

Numerical solution of E_x and H_y for y=0 m section

Numerical solution of E_x、E_y and H_y for y=100 m section

Comparison between numerical solution and analytical solution of y=100 m profile

Schematic diagram of submarine cable model in horizontal terrain

Section of electromagnetic field component

Section of electromagnetic field components in seawater layer

Comparison of different depths of E_x component

Comparison of different depths of H_y component

Comparison of different depths of E_x component

Comparison of different depths of H_y component

Submarine cable model in undulating terrain

Component diagram of electromagnetic field in x and y directions of submarine cable model (calculation area)

H_y distribution of magnetic field component of z=0 m line

Mud layer top interface

H_y section of magnetic field component

H_y normalization results

Distribution of H_y normalized error deviation of magnetic field components in different horizons

Distribution of H_y normalized error deviation of plane magnetic field component z=-1 m

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