水下声道中射线动力学对纵向声速变化垂直尺度的敏感性
Sensitivity of ray dynamics in an underwater sound channel to vertical scale of longitudinal sound-speed variations
摘要：
研究了距离相关的水下声波导中的声线传播。我们的注意力集中在射线动力学的海洋内波引起的声速扰动的垂直结构的敏感性。两种模型的纵向声速变化被认为是：一个周期性的不均匀性和随机的。研究发现，垂直振动的声速扰动可以影响射线的共振方式。这种共振在相空间的某些区域中引起混沌。它示出，在实验中观察到的陡峭的射线的稳定性，连接在小尺度的垂直声速振荡的情况下，与谐振的抑制。
英文摘要：
We investigate sound ray propagation in a range-dependent underwater acoustic waveguide. Our attention is focused on sensitivity of ray dynamics to the vertical structure of a sound-speed perturbation induced by ocean internal waves. Two models of longitudinal sound-speed variations are considered: a periodic inhomogeneity and a stochastic one. It is found that vertical oscillations of a sound-speed perturbation can affect rays in a resonant manner. Such resonances give rise to chaos in certain regions of phase space. It is shown that stability of steep rays, being observed in experiments, is connected with suppression of resonances in the case of small-scale vertical sound-speed oscillations.
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