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Published on: February 13, 2018
Mode coupling in a coastal wedge due to quasi-crossing of range-dependent modal eigenvalues
Yanyu Jiang1, Qianchu Zhang1, Boris Katsnelson1
1Department of Marine Geosciences, University of Haifa, 199 Abba Khouchy Avenue, 3498838, Israel maple_yy@163.com, zqcouc@163.com, bkatsnels@univ.haifa.ac.il.
Abstract:
A specific mechanism of mode coupling in a waveguide propagation is studied when two range-dependent eigenvalues approach each other. This phenomenon is analogous to the so-called quasi-crossing of states in atomic physics (Landau-Zener theory). It is considered for the sound wave propagation in a coastal wedge in the presence of a sound-speed profile. The change in mode composition and the corresponding spatial variability of the sound field are analyzed by using modes coupling equations and the parabolic equation with a field decomposition over adiabatic modes, respectively.
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