| 弹性波正演模拟中PML吸收边界条件的改进 |
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| 引用本文： | 秦臻,任培罡,姚姚,张才.弹性波正演模拟中PML吸收边界条件的改进[J].地球科学,2009(4). |
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| 作者姓名： | 秦臻 任培罡 姚姚 张才 |
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| 作者单位： | 中国地质大学地球物理与空间信息学院;中国石油勘探开发研究院;中国地质大学资源学院; |
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| 基金项目： | 国家自然科学基金项目(No.40274038) |
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| 摘 要： | 在弹性波有限差分正演模拟中,完全匹配层(PML)吸收边界条件是使用广泛、吸收效果最好的吸收边界条件.在目前的两种PML实现方法中,分裂形式的完全匹配层(SPML)方法计算存储量大、编程实现复杂;非分裂形式的完全匹配层(NPML)方法计算效率低、计算过程复杂.针对传统PML吸收边界条件在实现过程中存在的问题,推导出了一种简洁有效的非卷积实现的NPML吸收边界条件,既不需要对场分量进行分裂,也不需要做复杂的卷积运算.分析结果表明,本文实现的NPML吸收边界条件不仅具有良好的吸收衰减性能,而且计算方程简单,编程实现容易,占有内存更小.
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| 关 键 词： | PML 吸收边界条件 弹性波 正演模拟 地球物理 |
Improvement of PML Absorbing Boundary Conditions in Elastic Wave Forward Modeling |
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| QIN Zhen,Ren Pei-gang,YAO Yao,ZHANG Cai.Improvement of PML Absorbing Boundary Conditions in Elastic Wave Forward Modeling[J].Earth Science-Journal of China University of Geosciences,2009(4). |
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| Authors: | QIN Zhen Ren Pei-gang YAO Yao ZHANG Cai |
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| Institution: | QIN Zhen1,3,Ren Pei-gang2,YAO Yao1,ZHANG Cai3 1.Institute of Geophysics & Geomatics,China University of Geosciences,Wuhan 430074,China 2.Faculty of Earth Resources,China 3.Research Institute of Petroleum Exploration , Development,PetroChina,Beijing 100083,China |
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| Abstract: | In finite-difference time-domain modeling of elastic waves,absorbing boundary conditions are used to mitigate undesired reflections from the model's truncation boundaries.The perfectly matched layer(PML)is generally acknowledged as the best available absorbing boundary condition and very efficient to absorb both body waves and surface waves.The classical splitting PML(SPML)has some disadvantages:it needs much computer memory and has complex programming process.And the conventional non-splitting PML(NPML)bas... |
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| Keywords: | perfectly matched layer absorbing boundaries elastic wave forward modeling geophysics |
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