What is it about?
It is correctly (in terms of mathematics) shown that under the influence of hydrodynamic random processes in shallow sea there are an important changes in sound transmission losses and fluctuations of acoustical intensity. In the number of cases intensity fluctuations (scintillation index) are quickly developed while transmission losses are considerably slowed.
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Why is it important?
We have shown that fluctuations in the speed of sound in shallow sea conditions in comparison with the deep ocean lead not only to fluctuations in the phase of the propagating signal, but also to its amplitude. In many cases this in principle changes the behavior of the intensity and underlies the effects of flicker, intermittency and others observed in the atmosphere in the propagation of radio waves.
Perspectives
The results of the work are original and important both in terms of understanding the propagation of acoustic signals in the real sea with parameter fluctuations and in terms of improving algorithms for processing acoustic information that is necessary for underwater communication, navigation, and the like.
Oleg Gulin
V.I. Il'ichev Pacific Oceanological Institute, FEB RAS
Read the Original
This page is a summary of: Simulation of low-frequency sound propagation in shallow sea with
two-dimensional random inhomogeneities, January 2015, Acoustical Society of America (ASA),
DOI: 10.1121/2.0000196.
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