关键词: Scholte波, Airy相, 频散特性, 滑动窗, 群速度

Abstract: In order to study the formation mechanism of the Scholte wave Airy phase, clarify its characteristics and variation laws, the wave field expression of Scholte wave excited by pulse sound source were derived based on the shallow water semi-infinite elastic seabed sound field model. The high-order staggered grid finite difference algorithm was used to simulate the Scholte wave excited by the pulse sound source, and the relationship between the amplitude of Airy wave and the propagation distance was obtained. The results show that the dispersion of Scholte wave can cause a minimum group velocity, leading to the appearance of Airy wave during the propagation of the pulse signal, with an amplitude proportional to .Conducting a Scholte wave experiment excited by an air gun sound source on the lake, the moving window analysis method was used to analyze the experiment data, the results show that there was obvious dispersion phenomenon in the frequency band below 12 Hz. When the frequency was higher than 12 Hz, the group velocity remained basically unchanged as the frequency increased. At the same time, the group velocity showed a decreasing and then increasing trend with increasing frequency, reproducing and confirming the dispersion relationship of Scholte wave group velocity in theoretical research.

Key words: Scholte wave, Airy phase, dispersion characteristics, moving window, group velocity