We present a theoretical basis for a direct method of determining buoyancy period (frequency) as a function of depth by registering the displacements and oscillations of the hydrodynamic wake formed in a stationary liquid by freely ascending bubbles 9the density marker method). We achieve an error no greater than 5/100 by comparing theoretical computations of parameters for internal waves generated by a free submerged thin wake having uniform transverse density distribution in an exponentially stratified liquid with measurements of internal waves in the liquid. We find that there is a power law for the decrease in amplitude of internal oscillations with time.
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