Abstract
Sound pulse propagation in shallow water is studied. We assume a geometry where an acoustic track crosses the wave-front of a moving internal soliton (IS) or train of solitons. During propagation, sound pulses undergo perturbation due to mode coupling. For each individual mode selected at the receiver, we observe a set of incoming pulses, each having different arrival times. Time-frequency analysis is carried out for the modal arrival times for different frequencies, emphasizing the dependence on position of the moving solitons. It is shown that the maximum amplitude of the incoming pulses created at the ISs due to mode coupling has approximately the same arrival time, independent of frequency. This invariant arrival time is determined by waveguide parameters and corresponds to maximal coupling of different pairs of modes. Analysis is carried out both for a model shallow water channel and for real experiment data (SWARM95, NRL acoustic track). Satisfactory agreement is demonstrated, and physical interpretation of observed effect is discussed. [Work is supported by ONR and RFBR.]
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