Abstract
The nonlinear interaction of lower order modes in an acoustic waveguide is investigated. For finite-amplitude wave propagation, nonlinear effects redistribute the modal amplitudes as a function across frequency and wave number. Therefore, the nonlinear propagation in a waveguide can produce an arrival structure quite different from the classical result. Simulations with the NPE code [McDonald and Kuperman, J. Acoust. Soc. Am. 81, 1406–1417 (1987)] were used to study this frequency mode coupling in a realistic ocean waveguide.
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