Abstract
The long-range sound propagation in a horizontally inhomogeneous underwater sound channel is considered. It is shown that the vertical oscillations of inhomogeneity affect the near-axis rays in a resonant way and destroy their stability. As a consequence, the near-axis rays exhibit a chaotic behavior. The ray chaos manifests itself as intensification of interaction between adjacent low-order modes. In this case, a great number of strongly coupled modes appear, and the field structure near the channel axis becomes diffusive. However, as the signal frequency decreases, the inhomogeneity oscillations in depth lead to decoupling of adjacent modes and, hence, to suppression of chaos. As a result, the field structure near the channel axis becomes regular, which is confirmed by numerical simulation.
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