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    弹性波正演模拟中PML吸收边界条件的改进

    秦臻 任培罡 姚姚 张才

    秦臻, 任培罡, 姚姚, 张才, 2009. 弹性波正演模拟中PML吸收边界条件的改进. 地球科学, 34(4): 658-664.
    引用本文: 秦臻, 任培罡, 姚姚, 张才, 2009. 弹性波正演模拟中PML吸收边界条件的改进. 地球科学, 34(4): 658-664.
    QIN Zhen, REN Pei-gang, YAO Yao, ZHANG Cai, 2009. Improvement of PML Absorbing Boundary Conditions in Elastic Wave Forward Modeling. Earth Science, 34(4): 658-664.
    Citation: QIN Zhen, REN Pei-gang, YAO Yao, ZHANG Cai, 2009. Improvement of PML Absorbing Boundary Conditions in Elastic Wave Forward Modeling. Earth Science, 34(4): 658-664.

    弹性波正演模拟中PML吸收边界条件的改进

    基金项目: 

    国家自然科学基金项目 40274038

    详细信息
      作者简介:

      秦臻(1978-), 男, 博士, 主要从事油气地球物理正反演研究.E-mail: qinzhen1978@163.com

    • 中图分类号: P631.4

    Improvement of PML Absorbing Boundary Conditions in Elastic Wave Forward Modeling

    • 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.

       

    • 图  1  不同放大比例的波场快照(0.42 s) 比较

      a.原始; b.放大10倍; c.放大100倍; d.放大1 000倍

      Fig.  1.  Comparing of some scaling for wave shot

      图  2  使用和未使用PML介质时的地震记录比较

      a.使用PML; b.使用PML并放大100倍; c.未使用PML; d.未使用PML放大100倍

      Fig.  2.  Comparing for seismic record with or without using PML media

      表  1  不同PML吸收边界条件方法比较

      Table  1.   Comparing of some kinds of PML absorbing boundary conditions

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    出版历程
    • 收稿日期:  2008-08-28
    • 刊出日期:  2009-07-25

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