1aAO12. Acoustic scintillation due to shallow-water internal solitary waves: Theory and experiment.

Session: Monday Morning, June 16


Author: V. R. Djachenko
Location: Inst. of Acoust., 4 Shvernik St., Moscow 117036, Russia
Author: K. V. Konyaev
Location: Inst. of Acoust., 4 Shvernik St., Moscow 117036, Russia
Author: D. E. Leikin
Location: Inst. of Acoust., 4 Shvernik St., Moscow 117036, Russia
Author: K. D. Sabinin
Location: Inst. of Acoust., 4 Shvernik St., Moscow 117036, Russia
Author: Yu. I. Tuzhilkin
Location: Inst. of Acoust., 4 Shvernik St., Moscow 117036, Russia

Abstract:

In August--September 1990, an acoustics experiment was performed in the shallow-water region near Kamchatka. A 11/2-h time series representing amplitude fluctuations of 800-Hz, 160-Hz-bandwidth acoustic pulses was obtained by a hydrophone moored 34 km from the source. During the same period, a time series representing solitonlike vertical displacements of the thermocline near the receiver was recorded using a 37.5-m vertical temperature sensor. The two records were found to display abnormal similarity at time delays of 16.5 and 44.5 min. The effect is shown to be due to modal synchronism that may take place in shallow-water lossy-bottom regions with a small downward-positive gradient of the sound velocity. Theoretical explanation is verified by numerical simulation in which received signals are modeled by Fourier synthesis based on coupled-mode wave-field solutions in a stratified channel with a moving internal solitary wave. On the basis of the theory developed, new possible approaches for acoustic remote sensing are discussed.


ASA 133rd meeting - Penn State, June 1997