An experimental investigation of the horizontal refraction of low‐frequency acoustic waves in shallow water

1991 ◽  
Vol 89 (4B) ◽  
pp. 1982-1982
Author(s):  
A. Yu. Shmelerv ◽  
V. G. Petnikov ◽  
A. A. Migulin ◽  
James F. Lynch
Keyword(s):  
Experimental Investigation ◽  
Shallow Water ◽  
Acoustic Waves ◽  
Low Frequency ◽  
Horizontal Refraction

scholarly journals Horizontal Refraction of Acoustic Waves in Shallow-Water Waveguides Due to an Inhomogeneous Bottom Structure

2021 ◽  
Vol 9 (11) ◽  
pp. 1269
Author(s):  
Andrey Lunkov ◽  
Danila Sidorov ◽  
Valery Petnikov
Keyword(s):  
Shallow Water ◽  
Parabolic Equations ◽  
Acoustic Waves ◽  
Sound Propagation ◽  
Transmission Loss ◽  
Three Dimensional ◽  
Transitional Region ◽  
Wave Effect ◽  
Low Frequencies ◽  
Horizontal Refraction

Three-Dimensional (3-D) sound propagation in a shallow-water waveguide with a constant depth and inhomogeneous bottom is studied through numerical simulations. As a model of inhomogeneity, a transitional region between an acoustically soft and hard bottom is considered. Depth-averaged transmission loss simulations using the “horizontal rays and vertical modes” approach and mode parabolic equations demonstrate the horizontal refraction of sound in this region, even if the water column is considered homogeneous. The observed wave effect is prominent at low frequencies, at which the water depth does not exceed a few acoustic wavelengths. The obtained results within the simplified model are verified by the simulations for a real seabed structure in the Kara Sea.

Phase fluctuations and horizontal refraction of low‐frequency sound signals in shallow water in presence of internal waves.

2008 ◽  
Vol 124 (4) ◽  
pp. 2443-2443
Author(s):  
Mohsen Badiey ◽  
Jing Luo ◽  
Boris Katsnelson ◽  
Alexander Tskhoidze ◽  
James Lynch ◽  
...  
Keyword(s):  
Shallow Water ◽  
Internal Waves ◽  
Low Frequency ◽  
Phase Fluctuations ◽  
Frequency Sound ◽  
Horizontal Refraction

scholarly journals Theoretical Model of Acoustic Wave Propagation in Shallow Water

2017 ◽  
Vol 24 (2) ◽  
pp. 48-55 ◽  
Author(s):  
Eugeniusz Kozaczka ◽  
Grażyna Grelowska
Keyword(s):  
Shallow Water ◽  
Acoustic Field ◽  
Acoustic Waves ◽  
Sound Propagation ◽  
Low Frequency ◽  
Water Layer ◽  
Surface Shape ◽  
Shallow Sea ◽  
Multiple Reflections ◽  
Indirect Determination

Abstract The work is devoted to the propagation of low frequency waves in a shallow sea. As a source of acoustic waves, underwater disturbances generated by ships were adopted. A specific feature of the propagation of acoustic waves in shallow water is the proximity of boundaries of the limiting media characterised by different impedance properties, which affects the acoustic field coming from a source situated in the water layer “deformed” by different phenomena. The acoustic field distribution in the real shallow sea is affected not only by multiple reflections, but also by stochastic changes in the free surface shape, and statistical changes in the seabed shape and impedance. The paper discusses fundamental problems of modal sound propagation in the water layer over different types of bottom sediments. The basic task in this case was to determine the acoustic pressure level as a function of distance and depth. The results of the conducted investigation can be useful in indirect determination of the type of bottom.

Low-frequency bottom reverberation in shallow-water ocean regions

2004 ◽  
Vol 50 (1) ◽  
pp. 37-45 ◽  
Author(s):  
V. A. Grigor’ev ◽  
V. M. Kuz’kin ◽  
B. G. Petnikov
Keyword(s):  
Shallow Water ◽  
Low Frequency

Extremely thin reflective metasurface for low-frequency underwater acoustic waves: Sharp focusing, self-bending, and carpet cloaking

2021 ◽  
Vol 130 (12) ◽  
pp. 125304
Author(s):  
Zhong Chen ◽  
Fei Yan ◽  
Mehrdad Negahban ◽  
Zheng Li
Keyword(s):  
Acoustic Waves ◽  
Low Frequency ◽  
Underwater Acoustic ◽  
Sharp Focusing
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