Features of the Invariant of the Spatial–Frequency Interference Structure of Acoustic Fields in Oceanic Waveguides
- Autores: Petukhov Y.V.1, Borodina E.L.1, Burdukovskaya V.G.1
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Afiliações:
- Applied Physics Institute
- Edição: Volume 64, Nº 4 (2018)
- Páginas: 479-491
- Seção: Ocean Acoustics. Hydroacoustics
- URL: https://journals.rcsi.science/1063-7710/article/view/186630
- DOI: https://doi.org/10.1134/S1063771018030132
- ID: 186630
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Resumo
The paper considers the regular patterns that can be manifested in the behavior of the invariant of the spatial–frequency interference structure of an acoustic field in oceanic waveguides that are homogeneous and inhomogeneous along a track. Using the WKB and adiabatic approximations, an analytic expression is obtained for the invariant that, when certain conditions are fulfilled, reduces to the well-known classical expression independent of the mode numbers, their parity, or the emission frequency. It has been established that the approximate classical expression for the invariant correctly describes the slope of interference lines only in ranges of variation in the grazing angles of modes where the dependence of the cycle length of their corresponding Brillouin waves on the ray parameter is quite smooth and monotonic. The paper studies the formation of the spatial–frequency interference structure of an acoustic field propagating from a shallowwater isovelocity waveguide to a relatively deep-water waveguide with a near-surface sound channel.
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Sobre autores
Yu. Petukhov
Applied Physics Institute
Autor responsável pela correspondência
Email: yuvpetukhov@yandex.ru
Rússia, Nizhny Novgorod, 603950
E. Borodina
Applied Physics Institute
Email: yuvpetukhov@yandex.ru
Rússia, Nizhny Novgorod, 603950
V. Burdukovskaya
Applied Physics Institute
Email: yuvpetukhov@yandex.ru
Rússia, Nizhny Novgorod, 603950
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