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首页> 外文期刊>Journal of Seismic Exploration >COMPARISON BETWEEN THE NEARLY PERFECTLY MATCHED LAYER AND UNSPLIT CONVOLUTIONAL PERFECTLY MATCHED LAYER METHODS USING ACOUSTIC WAVE MODELING
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COMPARISON BETWEEN THE NEARLY PERFECTLY MATCHED LAYER AND UNSPLIT CONVOLUTIONAL PERFECTLY MATCHED LAYER METHODS USING ACOUSTIC WAVE MODELING

机译：使用声波建模的近完全匹配层与非离散卷积完全匹配层方法的比较

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摘要

The unsplit convolutional perfectly matched layer (CPML) and nearly perfectly matched layer (NPML) methods both have been proven to be very efficient algorithms for eliminating artificial reflections from the edges of the synthetic seismic wave models. Their absorbing performance and efficiency have been studied in separate works in several papers. Obviously, if we provide numerical comparisons between CPML and NPML in seismic modeling, it is very helpful to understand their performances and differences. In this paper, we will carry out these comparisons using 2D acoustic wave modeling codes with staggered-grid finite-difference schemes. For the implementation of the finite-difference operator, we employ fourth-order accuracy methods in space and second-order accuracy methods in time. In the model tests, we demonstrate that NPML has the same absorbing performance as CPML, with some very minor differences. We suggest that more analysis will be needed to study how these methods perform in the wide varieties of complex media that are typically used in seismic modeling.
机译：未分裂的卷积完全匹配层（CPML）和几乎完全匹配层（NPML）方法都已被证明是消除合成地震波模型边缘的人工反射的非常有效的算法。在几篇论文的单独工作中对它们的吸收性能和效率进行了研究。显然，如果我们在地震建模中提供CPML和NPML之间的数值比较，那么了解它们的性能和差异将非常有帮助。在本文中，我们将使用具有交错网格有限差分方案的二维声波建模代码进行这些比较。为了实现有限差分算子，我们在空间中采用了四阶精度方法，并且在时间上采用了二阶精度方法。在模型测试中，我们证明了NPML具有与CPML相同的吸收性能，但有一些非常小的差异。我们建议需要进行更多分析，以研究这些方法在地震建模中通常使用的各种复杂介质中的性能。

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