Otimização computacional da técnica dos elementos finitos para o modelamento geofísico eletromagnético

Feature Extraction of Structures in Sea Water Using Self-Organizing Maps and Electromagnetic Waves

“…The direct model for the dynamic structures under sea water was obtained from computer simulation using the Finite Elements Method presented in [1], based on the model described by Figure 1. A sufficiently distant source generated EM plane waves, within a frequency range from 10 0 Hz to 10 4 Hz, which in sea water indicates a depth of penetration varying from 222.817 m to 2.228 m. Snapshots were taken with 20 s difference between each other, from 0 s to 160 s. The conductive and resistive objects are respectively centred at 0 m and −25 m along the sea line (x-axis).…”

“…Based on this, the primary field differential equation turns into a ODE, with analytical solution [1]. From Maxwell equations on Frequency Domain for primary and secondary fields, the differential equation for the secondary field can be deduced [1].…”

“…From Maxwell's Equations, the secondary magnetic field can be derived [1], resulting in the differential equation shown in Equation (2.6), where γ = √ ZY is the medium propagation constant [9].…”

“…Based on the components of H t and E t , the expressions of apparent resistivity and phase for the TM Mode can be derived, as shown in Equations (2.7) and (2.8), respectively [1].…”