Title :
Ocean variability effects on sound propagation in shallow water
Author :
Nielsen, P.L. ; Siderius, M. ; Jensen, F.B.
Author_Institution :
SACLANT Undersea Res. Centre, La Spezia, Italy
Abstract :
In May 1997 SACLANT Undersea Research Centre conducted an experiment south of the Island of Elba off the west cost of Italy to investigate the time variability of received broadband acoustic signals over a 15.5-km fixed propagation path for 36 h. Environmental data were continuously acquired during the acoustic transmissions to establish a meaningful correlation between changes in the ocean and the received acoustic signals. Stability of the acoustic signals in the frequency band 300-850 Hz was seen up to several hours, but this stability period was reduced to a few minutes for frequencies between 850 and 7500 Hz. Numerical modeling of acoustic propagation through numerically generated sound speed profiles caused by internal waves shows similar effects as observed in the data. The influence of this variability in the synthetic data on source localization is addressed
Keywords :
oceanographic regions; oceanography; underwater acoustic propagation; 300 to 7500 Hz; AD 1997 05; Mediterranean Sea; Tyrrhenian Sea; acoustic wave propagation; acoustics; broadband acoustic signal; coast; dynamics; internal wave; numerical model; ocean; ocean variability effect; shallow water; sound propagation; underwater sound; Acoustic measurements; Acoustic propagation; Acoustic transducers; Acoustic waves; Chirp modulation; Frequency; Ocean temperature; Sea measurements; Stability; Underwater acoustics;
Conference_Titel :
OCEANS '99 MTS/IEEE. Riding the Crest into the 21st Century
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-5628-4
DOI :
10.1109/OCEANS.1999.805912
