Comparison of the Vorticity of Acoustic Intensity Vector at 23 Hz and 110 Hz Frequencies in the Shallow Sea

Vladimir Shchurov

Abstract


This paper presents the results of vortex features research of the field of acoustic intensity vector depending on distance and frequency by the combined acoustic systems in Peter the Great Bay (Sea of Japan). The receiver was submerged to 70 m depth at the site depth of 120 m, sound velocity on the surface was higher than that of the bottom’s one. To determine the vorticity three components of curl of intensity vector were calculated. The work provides the distribution histograms of probability density in the normalized components of intensity vector curl at 110 Hz and 23 Hz frequencies for the distances interval between source and receiver within 1200 – 2000 m. The vortex structure of acoustic intensity vector was discovered in vertical plane along the entire researched distance (5000 m) between source and receiver. The described mechanism of acoustic energy transfer reveals new opportunities in the study of acoustic characteristics of the shallow sea. The disclosed vortex structures are of interest both for physical acoustics and for applied problems in underwater acoustics.

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Applied Physics Research   ISSN 1916-9639 (Print)   ISSN 1916-9647 (Online)

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