水平平面内趋近非线性内波的声多径到达。

Acoustic multipath arrivals in the horizontal plane due to approaching nonlinear internal waves.

机构信息

Physical Ocean Science and Engineering, University of Delaware, Newark, Delaware 19716, USA.

出版信息

J Acoust Soc Am. 2011 Apr;129(4):EL141-7. doi: 10.1121/1.3553374.

Abstract

Simultaneous measurements of acoustic wave transmissions and a nonlinear internal wave packet approaching an along-shelf acoustic path during the Shallow Water 2006 experiment are reported. The incoming internal wave packet acts as a moving frontal layer reflecting (or refracting) sound in the horizontal plane. Received acoustic signals are filtered into acoustic normal mode arrivals. It is shown that a horizontal multipath interference is produced. This has previously been called a horizontal Lloyd's mirror. The interference between the direct path and the refracted path depends on the mode number and frequency of the acoustic signal. A mechanism for the multipath interference is shown. Preliminary modeling results of this dynamic interaction using vertical modes and horizontal parabolic equation models are in good agreement with the observed data.

摘要

同时测量了在浅海 2006 实验期间，沿架声路径传播的声波和非线性内波包。传入的内波包充当移动的前导层，在水平面上反射（或折射）声音。接收到的声信号被过滤成声正常模式到达。结果表明，产生了水平多径干扰。这以前被称为水平劳埃德镜。直接路径和折射路径之间的干扰取决于声信号的模式数和频率。展示了多径干扰的一种机制。使用垂直模式和水平抛物线方程模型对这种动态相互作用的初步建模结果与观测数据非常吻合。