Grigorev Valery A.

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Grigorev
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Valery A.
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  • Article
    Temporal sound field fluctuations in the presence of internal solitary waves in shallow water
    (Acoustical Society of America, 2009-06-19) Katsnelson, Boris G. ; Grigorev, Valery A. ; Badiey, Mohsen ; Lynch, James F.
    Temporal variations of intensity fluctuations are presented from the SWARM95 experiment. It is hypothesized that specific features of these fluctuations can be explained by mode coupling due to the presence of an internal soliton moving approximately along the acoustic track. Estimates are presented in conjunction with theoretical consideration of the shallow water waveguide.
  • Article
    Intensity fluctuations of midfrequency sound signals passing through moving nonlinear internal waves
    (Acoustical Society of America, 2008-08-28) Katsnelson, Boris G. ; Grigorev, Valery A. ; Lynch, James F.
    The fluctuations of intensity of broadband pulses in the midfrequency range (2–4.5kHz) propagating in shallow water in the presence of intense internal waves moving approximately along the acoustic track are considered. These pulses were received by two separate single hydrophones placed at different distances from the source (∼4 and ∼12km) and in different directions. It is shown that the frequency spectra of the fluctuations for these hydrophones have different predominating frequencies corresponding with the directions of the acoustic track. Comparisons of experimental results with theoretical estimates demonstrate good consistency.
  • Article
    Variability of phase and amplitude fronts due to horizontal refraction in shallow water
    (Acoustical Society of America, 2018-01-16) Katsnelson, Boris G. ; Grigorev, Valery A. ; Lynch, James F.
    The variability of the interference pattern of a narrow-band sound signal in a shallow water waveguide in the horizontal plane in the presence of horizontal stratification, in particular due to linear internal waves, is studied. It is shown that lines of constant phase (a phase front) and lines of constant amplitude/envelope (an amplitude front) for each waveguide mode may have different directions in the spatial vicinity of the point of reception. The angle between them depends on the waveguide's parameters, the mode number, and the sound frequency. Theoretical estimates and data processing methodology for obtaining these angles from experimental data recorded by a horizontal line array are proposed. The behavior of the angles, which are obtained for two episodes from the Shallow Water 2006 (SW06) experiment, show agreement with the theory presented.