Fig 1.
Schematic diagram of the transient electromagnetic method.
Fig 2.
Particle swarm optimization algorithm flowchart.
Fig 3.
Firefly optimization algorithm flowchart.
Fig 4.
Improved PSO-IFA hybrid optimization algorithm flowchart.
Fig 5.
The image of the Aekley function.
Fig 6.
The contrast curve of the algorithm convergence characteristics.
Fig 7.
The inversion results and curve of the objective function of the G-type geoelectric model.
Fig 8.
The inversion results and curve of the objective function of the H-type geoelectric model.
Fig 9.
The inversion results and curve of the objective function of the AQ-type geoelectric model.
Fig 10.
The curve of PSO-IFAH algorithm inversion results under the overburden layer model.
Fig 11.
The curve of FA algorithm inversion results under the overburden layer model.
Fig 12.
The curve of PSO algorithm inversion results under the overburden layer model.
Fig 13.
The inversion results and curve of the objective function of AQ-type geoelectric model with noise.
Table 1.
The table of inversion results of AQ type geoelectric model with no noise.
Table 2.
The table of inversion results of AQ type geoelectric model with 5% noise.
Table 3.
The table of inversion result of AQ type geoelectric model with 10% noise.
Fig 14.
The primeval multi-channel map of the TEM method.
Fig 15.
Comparison of inversion results for measured data.