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Exploration Geophysics Exploration Geophysics Society
Journal of the Australian Society of Exploration Geophysicists
RESEARCH ARTICLE (Open Access)

Comparison of artificial absorbing boundaries for acoustic wave equation modelling

Yingjie Gao 1 2 Hanjie Song 1 2 Jinhai Zhang 1 3 Zhenxing Yao 1
+ Author Affiliations
- Author Affiliations

1 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.

2 University of Chinese Academy of Sciences, Beijing 100049, China.

3 Corresponding author. Email: zjh@mail.iggcas.ac.cn

Exploration Geophysics 48(1) 76-93 https://doi.org/10.1071/EG15068
Submitted: 17 July 2015  Accepted: 22 November 2015   Published: 23 December 2015

Journal Compilation © ASEG 2017 Open Access CC BY-NC-ND

Abstract

Absorbing boundary conditions are necessary in numerical simulation for reducing the artificial reflections from model boundaries. In this paper, we overview the most important and typical absorbing boundary conditions developed throughout history. We first derive the wave equations of similar methods in unified forms; then, we compare their absorbing performance via theoretical analyses and numerical experiments. The Higdon boundary condition is shown to be the best one among the three main absorbing boundary conditions that are based on a one-way wave equation. The Clayton and Engquist boundary is a special case of the Higdon boundary but has difficulty in dealing with the corner points in implementaion. The Reynolds boundary does not have this problem but its absorbing performance is the poorest among these three methods. The sponge boundary has difficulties in determining the optimal parameters in advance and too many layers are required to achieve a good enough absorbing performance. The hybrid absorbing boundary condition (hybrid ABC) has a better absorbing performance than the Higdon boundary does; however, it is still less efficient for absorbing nearly grazing waves since it is based on the one-way wave equation. In contrast, the perfectly matched layer (PML) can perform much better using a few layers. For example, the 10-layer PML would perform well for absorbing most reflected waves except the nearly grazing incident waves. The 20-layer PML is suggested for most practical applications. For nearly grazing incident waves, convolutional PML shows superiority over the PML when the source is close to the boundary for large-scale models. The Higdon boundary and hybrid ABC are preferred when the computational cost is high and high-level absorbing performance is not required, such as migration and migration velocity analyses, since they are not as sensitive to the amplitude errors as the full waveform inversion.

Key words: absorbing boundary condition, Higdon boundary, hybrid ABC, perfectly matched layer, sponge boundary.


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