Pereselkov Serguey

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  • Article
    Measurement and modeling of three-dimensional sound intensity variations due to shallow-water internal waves
    (Acoustical Society of America, 2005-02) Badiey, Mohsen ; Katsnelson, Boris G. ; Lynch, James F. ; Pereselkov, Serguey ; Siegmann, William L.
    Broadband acoustic data (30–160 Hz) from the SWARM'95 experiment are analyzed to investigate acoustic signal variability in the presence of ocean internal waves. Temporal variations in the intensity of the received signals were observed over periods of 10 to 15 min. These fluctuations are synchronous in depth and are dependent upon the water column variability. They can be explained by significant horizontal refraction taking place when the orientation of the acoustic track is nearly parallel to the fronts of the internal waves. Analyses based on the equations of vertical modes and horizontal rays and on a parabolic equation in the horizontal plane are carried out and show interesting frequency-dependent behavior of the intensity. Good agreement is obtained between theoretical calculations and experimental data.
  • Article
    Frequency dependence and intensity fluctuations due to shallow water internal waves
    (Acoustical Society of America, 2007-08) Badiey, Mohsen ; Katsnelson, Boris G. ; Lynch, James F. ; Pereselkov, Serguey
    A theory and experimental results for sound propagation through an anisotropic shallow water environment are presented to examine the frequency dependence of the scintillation index in the presence of internal waves. The theory of horizontal rays and vertical modes is used to establish the azimutal and frequency behavior of the sound intensity fluctuations, specifically for shallow water broadband acoustic signals propagating through internal waves. This theory is then used to examine the frequency dependent, anisotropic acoustic field measured during the SWARM'95 experiment. The frequency dependent modal scintillation index is described for the frequency range of 30–200 Hz on the New Jersey continental shelf.