| 郭望,何晓,李嘉诚.利用流固界面Scholte波的地层横波速度反演方法*[J].,2025,43(3):713-722 |
| 利用流固界面Scholte波的地层横波速度反演方法* |
| Inversion of shear velocity profiles using Scholte waves on the fluid-solid boundary |
| 投稿时间：2023-12-12 修订日期：2025-04-25 |
| 中文摘要: |
| 多道面波分析方法是一种有效的地声参数反演和结构成像工具，以往大多数相关研究都集中在利用自由表面Rayleigh波进行评价，而对于存在上覆流体层模型利用流固边界Scholte波的反演研究较少。而Scholte波在流固界面传播具有幅度大，传播距离远，衰减损耗小等特性，且在传播过程中可反映水下地层的诸多信息，对于探测水下沉积物以及开展水底地层结构分析具有重要意义。该文研究了利用流固边界Scholte波的地层横波速度反演方法。首先建立流固水平多层模型，使用Haskell传递矩阵方法来计算并揭示多阶模式Scholte波传播的频散特征，然后从二维时域有限差分方法合成波形中拾取速度特征与理论频散曲线比较一致，验证了模拟方法的有效性。最后为了提高反演效率和稳定性，引入模式搜索方法和Kuhn-Munkres算法，利用添加噪声的人工合成数据对三种典型水下地层模型进行了数值反演验证。该反演方法非常适合解决具有高度非线性、多参数和多模态目标函数的问题，且不依赖初始模型，能够稳定高效地得到反演结果。各类模型的反演结果与输入地层非均匀横波速度剖面吻合良好。 |
| 英文摘要: |
| The multi-channel surface wave analysis method is an effective tool for earth acoustic parameter inversion and structural imaging. Most of the previous studies focused on the use of free surface Rayleigh waves for evaluations, while there were few studies on the use of Scholte waves for the model inversion with a covered fluid layer. Scholte waves have the characteristics of large amplitude, long propagation distance and small attenuation at the fluid-solid interface. Such a kind of surface waves are sensitive for the mechanical properties of fluid-solid interface, and can be applied for the detection of underwater sediments and the analysis of the formation structure of underwater strata. The inversion method of formation shear wave velocity using Scholte wave at fluid-solid boundary is studied in this paper. First, a fluid-solid model with horizontal multilayers is established. The Haskell transfer matrix method is applied and the dispersion characteristics of Scholte wave propagation with multiple modes is revealed. Then the velocity characteristics extracted from the waveforms, which are synthesized by a two-dimensional finite-difference time-domain method, are in good agreement with the theoretical dispersion curve, confirming the validity of the simulation method. Finally, in order to improve the inversion efficiency and stability, the model search method and Kuhn-Munkres algorithm are introduced to verify the numerical inversion of three typical underwater formation models based on synthetic data with added noises. The proposed inversion is suitable for solving the problems with high nonlinear, multi-parameter, and multi-modal objective function. The approach is independent on the initial model, and can evaluate the velocity profiles stably and efficiently. The inversion results of various models are in good agreement with the input stratified shear velocity profiles. |
| DOI：10.11684/j.issn.1000-310X.2025.03.020 |
| 中文关键词: Scholte波 反演 流固界面 横波速度 |
| 英文关键词: Scholte wave Inversion Fluid-solid boundary Shear velocity |
| 基金项目: |
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