Abstract
In order to study the dispersion characteristics of seabed seismic waves excited by acoustic sources in shallow water, the sound field at liquid-solid interface is derived based on the wave equation firstly, which results demonstrate that the longitudinal wave and transversal wave are not dispersive, while the Scholte wave is normal dispersive. Then, the numerical simulation is carried out on the sound field at the liquid-solid interface excited by the air gun sound source based on high-order staggered grid finite difference method, which results demonstrate that the dispersion phenomenon of Scholte waves is observed and the theoretical analysis results were verified. Finally, the data of experiment in the sea are analyzed based on the transformation, and the dispersion curve of Scholte wave is finely extracted.
Highlights
西北工业大学学报 Journal of Northwestern Polytechnical University https: / / doi.org / 10.1051 / jnwpu / 20193740724
In order to study the dispersion characteristics of seabed seismic waves excited by acoustic sources in shallow water, the sound field at liquid⁃solid interface is derived based on the wave equation firstly, which results demonstrate that the longitudinal wave and transversal wave are not dispersive, while the Scholte wave is normal dispersive
The numerical simulation is carried out on the sound field at the liquid⁃solid interface excited by the air gun sound source based on high⁃order staggered grid finite difference method, which results demonstrate that the dispersion phenomenon of Scholte waves is observed and the theoretical analysis results were verified
Summary
西北工业大学学报 Journal of Northwestern Polytechnical University https: / / doi.org / 10.1051 / jnwpu / 20193740724 1) 当海深与频率乘积很小(H·f → 0) 时 即海水深度非常浅或者表面波频率非常低时, tanh æ ç ω èc 2) 当海深与频率乘积很大 (H·f → ∞ ) 时 即海水深度非常深或者表面波频率非常高时, tanh æ ç ω èc 由仿真时预设玄武岩介质声学参数纵波速度 4 500 m / s、横波速度 1 900 m / s、声波速度 1 500 m / s, 观察图 4 可知,在 1.11 s 处出现纵波,在 2.63 s 处出 现横波,在 3.23 s 处出现声波,根据( 10) 式计算得
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