Abstract
The results of laboratory experiments on propagation of low-frequency acoustic waves produced by a parametric antenna in a few-mode waveguide with a linear depth variation along propagation direction are described. Mode structure of the radiated field and the characteristics of eigenwaves forming an acoustic field in waveguides of different types, which model shelf areas of the world oceans, are obtained. The study of the horizontal structure of separate normal waves was carried out by allocation of mode pulses due to the intermode dispersion. Also, the revealing of mode contents of radiated field was carried out by Fourier analysis of the signal received by evenly moving along the propagation route acoustic probe. The different Doppler frequency shifts of eigenmodes allows the resolution of each normal mode. It is shown experimentally that the azimuth structure of separate modes is transformed in the process of sound propagation to an area of smaller waveguide depths. For a particular mode, the direction at which mode radiation reaches a maximum value changes due to decreases in a waveguide depth when the number of normal waves evidently decreases. Experimental data obtained are confirmed by the results of numerical simulations. [Work supported by RFBR Grant No. 98-02-16402 and INTAS-RFBR Grant No. 95-IN-RU-0723.]
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