employee from 01.01.1981 to 01.01.2025
Vladivostok, Vladivostok, Russian Federation
Russian Federation
Vladivostok, Russian Federation
VAK Russia 1.6
UDC 534.2
UDC 551.46
UDC 551.468
UDC 55
UDC 550.34
UDC 550.383
CSCSTI 37.25
CSCSTI 37.01
CSCSTI 37.15
CSCSTI 37.31
CSCSTI 38.01
CSCSTI 36.00
CSCSTI 37.00
CSCSTI 38.00
CSCSTI 39.00
CSCSTI 52.00
Russian Classification of Professions by Education 05.00.00
Russian Library and Bibliographic Classification 223
Russian Library and Bibliographic Classification 26
Russian Trade and Bibliographic Classification 6325
Russian Trade and Bibliographic Classification 63
BISAC SCI SCIENCE
A statistical problem of the propagation and scattering of a low-frequency acoustic signal in a shallow-water waveguide with a randomly rough surface and a horizontal absorbing liquid bottom is considered. This inhomogeneous waveguide is studied using the cross-sectional method and local mode theory. To determine the mode amplitudes, a boundary value problem is formulated, which is replaced by a corresponding problem with initial conditions for the imbedding equations. The latter equations are solved without approximations using standard computational schemes, allowing for efficient modeling of the statistical characteristics of the sound signal field. This paper presents calculations of signal intensity attenuation and its fluctuations in an Arctic waveguide under developed surface waves and for two types of bottom boundary impedance. It is shown that the influence of a random surface on the intensity of a propagating signal is relatively small for paths of typical length in shallow water. Intensity losses due to fluctuations increase slowly with distance. A comparison of the results obtained using different methods for solving this statistical problem (adiabatic, WKB-approximation) reveals an observable quantitative discrepancy. It is shown that the type of the correlation function (spectrum) of surface fluctuations has little effect on the average intensity of the signal field, and attenuation is determined by the amplitude of the fluctuations and their correlation radius.
Shallow-water Arctic waveguide, randomly rough sea surface, cross-section method, local modes, imbedding equations, one-way propagation, adiabatic approximation, WKB-method, statistical modeling
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