| 用于地震波场模拟的PML边界衰减因子研究(英文) |
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| 引用本文： | 杨皓星,王红霞.用于地震波场模拟的PML边界衰减因子研究(英文)[J].应用地球物理,2013,10(1):63-70. |
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| 作者姓名： | 杨皓星 王红霞 |
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| 作者单位： | 国防科技大学理学院数学与系统科学系 |
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| 基金项目： | supported by the National Natural Science Foundation of China(No. 61072118) |
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| 摘 要： | 在地震波场数值模拟中,为了消除由人为边界产生的边界反射,需要引进边界吸收条件。本文从声波方程完全匹配层吸收边界的经典方法出发,基于高斯函数任意阶光滑的特点,提出了一种高斯型衰减因子,分析比较该因子与一般衰减因子的性质,并基于均匀与层状速度模型分别进行了数值模拟计算。数值结果显示,当选择相同的PML边界吸收层层数时,高斯型衰减因子的吸收效果明显优于一般的衰减因子,边界反射更少,信噪比更高;对比最近提出的正弦型衰减因子,在信噪比接近的情况下,高斯型衰减因子所需的PML吸收层层数更少。
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| 关 键 词： | 地震波场模拟 完全匹配层PML 衰减因子 |
A study of damping factors in perfectly matched layers for the numerical simulation of seismic waves |
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Yang Hao-Xing
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Wang Hong-Xia.A study of damping factors in perfectly matched layers for the numerical simulation of seismic waves[J].Applied Geophysics,2013,10(1):63-70. |
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| Authors: | ,
Yang Hao-Xing
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Wang Hong-Xia |
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| Institution: | School of Science, National University of Defense Technology, Changsha 410073, China |
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| Abstract: | When simulating seismic wave propagation in free space, it is essential to introduce absorbing boundary conditions to eliminate reflections from artificially truncated boundaries. In this paper, a damping factor referred to as the Gaussian damping factor is proposed. The Gaussian damping factor is based on the idea of perfectly matched layers (PMLs). This work presents a detailed analysis of the theoretical foundations and advantages of the Gaussian damping factor. Additionally, numerical experiments for the simulation of seismic waves are presented based on two numerical models: a homogeneous model and a multi-layer model. The results show that the proposed factor works better. The Gaussian damping factor achieves a higher Signal-to-Noise Ratio (SNR) than previously used factors when using same number of PMLs, and requires less PMLs than other methods to achieve an identical SNR. |
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| Keywords: | simulation of seismic wave perfectly matched layer (PML) damping factor |
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