Numerical analysis of induced magnetic field generated by finite-width ocean current
In order to quantitatively calculate the induced magnetic field generated by finite-width ocean currents,a stratified ocean current mathematical model was established,and a calculation method for the induced magnetic field generated by finite-width ocean currents was proposed.Based on the stratified ocean current mathematical model,the vector potential was calculated to obtain the numerical solution of the induced magnetic field generated by finite-width ocean currents.When the width of the ocean current tends to infinity,the numerical results are consistent with the analytical results of the infinite-width ocean current model,verifying the correctness of the method.Based on the obtained numerical expressions,the influence of seawater width and velocity on the induced magnetic field was analyzed.The results show that for constant-speed ocean currents,the wider the width,the more stable the distribution of the induced magnetic field in the center of the ocean current,and it decreases at the edges.Secondly,the induced magnetic field exhibits a linear distribution in the depth direction.For ocean currents with horizontal velocity decay,both the width of the ocean current and the degree of velocity decay have a significant impact on the distribution of the induced magnetic field.Within a reasonable range of parameters,the degree of velocity decay has a greater influence on the induced magnetic field.For ocean currents with vertical velocity decay,the induced magnetic field has a maximum value in the depth direction,and different ocean current widths and degrees of velocity decay have a significant impact on the position of the maximum value.
Finite-width ocean currentInduced magnetic fieldMultilayer ocean current modelOcean current velocityMarine electromagnetic detection
NETL
NSTL
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