Enhanced Difference Algorithm for Seismic Modeling Based on Fruit Fly Optimization
| Autor: | Guiwu Chen, Shouhua Dong, Mingdi Wei, Haibo Wu, Wenqiang Yang, Min Zhang, Yaping Huang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Geophysics
Environmental Engineering Computer science Seismic modeling 0202 electrical engineering electronic engineering information engineering 020201 artificial intelligence & image processing 02 engineering and technology 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Algorithm 0105 earth and related environmental sciences |
| Zdroj: | Journal of Environmental and Engineering Geophysics. 22:353-364 |
| ISSN: | 1943-2658 1083-1363 |
| DOI: | 10.2113/jeeg22.4.353 |
| Popis: | The acoustic wave equation is an important basis for seismic wave propagation, imaging, and migration. This equation has led to the development of finite difference methods, but these methods are prone to numerical instability and grid dispersion problems, with the issue of dispersion being the most vital. Optimization methods can improve the accuracy across a large range of wavenumbers or frequencies. In this paper, we present a novel evolutionary optimization scheme for the acoustic wave equation. Our approach involves combining the fruit fly optimization algorithm (FOA) and sampling approximation (SA) to obtain the optimal difference operator for a wide range of wavenumbers. The difference coefficients are optimized to be extracted by the FOA, and the function of fitness, which is used to introduce an iterative process to determine the best smells, is evaluated by acoustic wave simulations. Based on the space-domain dispersion relation, we prove that the accuracy with which the absolute error is minimized is the same as that of the relative error. Within a given range of wavenumbers, we propose a fitness function by minimizing the absolute errors of the space-domain dispersion relation, and the dispersion analysis reveals that this scheme is superior to the Taylor-expansion scheme. We conduct two experiments by applying homogeneous and complex models, respectively. Further, the modeling results indicate that the fruit fly optimization approach in conjunction with sampling approximation preserve a higher accuracy for a small operator length and reduce the numerical artifacts. |
| Databáze: | OpenAIRE |
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