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Acoustical observation of internal waves on the shelf of the Black Sea

Mikryukov A., Popov O., Serebryany A.

Hydroacoustics

2009

Vol. 12

153-158

In October, 2007, the Acoustics Institute performed complex acoustical and oceanological studies on a fixed experimental path in the Black Sea, near the Golubaya Bay. Sound signal with linear frequency modulation were used in the experiment. The processing of the experimental records consisted in computing the envelope of the correlation function of the received and transmitted signals and the time dependence of the correlation maxima. A characteristic change in arrival times of the rays is observed for the period of the income of cold near-bottom waters on the path. The quasi-harmonic variation in the arrival times of the ray groups allows one to correctly define the parameters of short-period internal waves accompanying the bore.

Propagation of pulsed sound signals on a shelf of free tidal sea: effects from coastal eddies and internal waves

Mikryukov A., Popov O., Serebryany A.

Hydroacoustics

2008

Vol. 11

279-288

A long term experiment on studying fluctuations of the parameters of pulsed sound signals in a shallow sea was carried out in the region of the northeastern coast of the Black sea in autumn, 2004. the data were collected on a 1.2-km fixed propagation pathat a 2-km distance from the coastline. During the entire experimentation, observations of temperature fluctuations near the receiving point were performed by the using the line temperature sensor. Fluctuations of the shape, energy and propagation time of the pulsed signals were studied. an attempt of their relation to the hydrodynamic processes on the shelf was taken. The change in the shape and the energy levelof the signal was analyzed for the moment of passing the anticyclonic topographic eddy over the coastal zone. It was shown that the fluctuations of the propagation time were sometimes as high as 17.6 ms. An enhanceof the short-period acoustic fluctuations accompanying the internsification of the internal waves was observed.