Acoustic observations of internal tides and tidal currents in shallow water.
- Resource Type
- Article
- Authors
- Turgut, Altan; Mignerey, Peter C.; Goldstein, David J.; Schindall, Jeffrey A.
- Source
- Journal of the Acoustical Society of America. Apr2013, Vol. 133 Issue 4, p1981-1986. 6p.
- Subject
- *TIDAL currents
*SHALLOW water acoustics
*ACOUSTIC signal processing
*BROADBAND communication systems
*SPECTROGRAMS
- Language
- ISSN
- 0001-4966
Significant acoustic travel-time variability and frequency shifts of acoustic intensity level curves in broadband signal spectrograms were measured in the East China Sea during the summer of 2008. The broadband pulses (270-330 Hz) were transmitted from a fixed source and received at a bottomed horizontal array, located at the 33 km range. The acoustic intensity level curves of the received signals indicate regular frequency shifts that are well correlated with the measured internal tides. Similarly, regular travel-time shifts of the acoustic mode arrivals correlate well with the barotropic tides and can be explained by tidal currents along the acoustic propagation track. These observations indicate the potential of monitoring internal tides and tidal currents using low-frequency acoustic signals propagating at long ranges. [ABSTRACT FROM AUTHOR]