Sturm Frédéric, Ivansson Sven, Jiang Yong-Min, Chapman N Ross
LMFA UMR CNRS 5509, Ecole Centrale de Lyon, Ecully Cedex, France.
J Acoust Soc Am. 2008 Dec;124(6):EL341-6. doi: 10.1121/1.3008068.
In an experiment in the Florida Straits, broadband pulses were transmitted over a range of 10 km and received by a vertical hydrophone array. For pulses with center frequency below 400 Hz, the received signal consisted of a dominant arrival followed by a secondary one delayed by about 0.4 s. A hypothesis that the secondary arrival was caused by 3D out-of-plane propagation is investigated here numerically with a 3D parabolic equation model (3DWAPE) and a 3D ray model (MOC3D). Both models clearly predict a secondary arrival caused by 3D horizontal refraction from the sloping bottom in the shoreward direction.
在佛罗里达海峡进行的一项实验中，宽带脉冲在10公里的范围内传输，并由垂直水听器阵列接收。对于中心频率低于400赫兹的脉冲，接收到的信号由一个主要波至和一个延迟约0.4秒的次要波至组成。本文利用三维抛物方程模型（3DWAPE）和三维射线模型（MOC3D），对次要波至是由三维面外传播引起的这一假设进行了数值研究。两个模型都清楚地预测了由向岸方向倾斜底部的三维水平折射引起的次要波至。
