海底无限长水平线电流源电磁场
来源期刊：中南大学学报(自然科学版)2001年第6期
论文作者：何继善 鲍力知
文章页码：551 - 554
关键词：电磁场;水平线电流源;海洋电磁法;海底
Key words：electromagnetic field; horizontal linear electric current; marine electromagnetic method; sea floor
摘 要：海底岩石电阻率远高于海水电阻率,假设将水平线电源敷设于海水与海底大地的分界面上,则在水平线电源中部一定范围内,可将线电源看成无限长水平线电源.根据2个介质的分界面上电场、磁场的切向分量连续,对于界面两侧介质导磁率均接近μ0的介质,磁场的法向分量也连续,从水平电偶极子在介质中的矢势公式出发,经过数学推导,得出了海底无限长水平线电流源电磁场频率域和时间域的解析表达式,为海洋电磁法的研究提供了一种理论依据.
Abstract: When the resistivity of sea floor rocks are much higher than that of seawater, ifwe lay horizontal linear electric current on the sea floor, it can be seen as infinite in the middle of the current. The shearing electric and magnetic vectors are continuous on the interface, and vertical magnetic vectors are also continuous when the permeability of rocks is μ0. According to vector potential formulation of horizontal electric dipole, the analytical formulation of infinite horizontal linear electric current on sea floor was obtained after precise physical and mathematical calculation. When the sea floor rocks are resistive, the formulation is correct in physics or mathematics in frequency domain and time domain. It provides a foundation of theory and methods for the development of marine electromagnetic method.
