HYDROACOUSTICS
ANNUAL JOURNAL |
START | NEW VOL 20 | SEARCH | STATISTICS | PAS - GDANSK DIVISION |
pp. 29-38, vol. 14, 2011 Agata Dragan Institute of Oceanology, PAS, Sopot, Poland Zygmunt Klusek Institute of Oceanology, PAS, Sopot, Poland Barbara Swerpel Institute of Hydroengineering, PAS, Sopot, Poland Key words: Baltic Sea; noise correlation; acoustic events recognition and tracking; histogram Abstract: This study is a preliminary work aiming to obtain statistics of wind waves on the base of the ambient sea noise parameters. In experiment conducted on the Baltic Sea, passive acoustic
methods were exploited in order to detect and parameterize breaking evens. A four hydrophones
array was used to record ambient sea noise for five days. Data collected during this experiment
allowed us to track moving acoustic sources, to estimate their speed, duration and number in
a unit of time. All these parameters were determined using generalized the cross correlation
method. Some examples of obtained cross correlation time series with brief description
of encountered difficulties in analysis are presented. Variation in number, duration and speed
of breaking events in time are compared with averaged noise level and significant wave height.
This last parameter, describing in a unified way the wave field, constitutes the essence
of further investigations. Distributions of obtained values are shown and further improvement
of a method is shortly introduced.
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