Abstract
Background: Recently, Particle Swarm Optimization (PSO) has been increasingly used in
geophysics due to its simple operation and fast convergence.
Objective: However, PSO lacks population diversity and may fall to local optima. Hence, an Improved
Hybrid Particle Swarm Optimizer with Sine-Cosine Acceleration Coefficients (IH-PSO-SCAC) is proposed
and successfully applied to test functions in Transient Electromagnetic (TEM) nonlinear inversion.
Methods: A reverse learning strategy is applied to optimize population initialization. The sine-cosine
acceleration coefficients are utilized for global convergence. Sine mapping is adopted to enhance population
diversity during the search process. In addition, the mutation method is used to reduce the probability
of premature convergence.
Results: The application of IH-PSO-SCAC in the test functions and several simple layered models are
demonstrated with satisfactory results in terms of data fit. Two inversions have been carried out to test
our algorithm. The first model contains an underground low-resistivity anomaly body and the second
model utilized measured data from a profile of the Xishan landslide in Sichuan Province. In both cases,
resistivity profiles are obtained, and the inverse problem is solved for verification.
Conclusion: The results show that the IH-PSO-SCAC algorithm is practical, can be effectively applied
in TEM inversion and is superior to other representative algorithms in terms of stability and accuracy.
Keywords:
Particle swarm optimization, transient electromagnetic, inversion, sine-cosine acceleration coefficients, reverse learning strategy, sine mapping, mutation.
Graphical Abstract
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