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© Woods Hole Oceanographic Institution © University of Washington |
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| Last updated May 2010 |
Internal waves, intrusions, and coastal zone acoustics
Timothy F. Duda, Andone C. Lavery, and Jon M. Collis
| Ubiquitous linear internal waves are known to dominate fluctuations of long-range low-frequency sound in the deep ocean. In the coastal zone, however, variations in low-frequency-sound propagation caused by large episodic nonlinear internal waves are often dominant and have been studied in detail. Apart from this, sound-speed anomalies from smaller but pervasive linear internal waves can also influence propagation, as do density-compensated temperature/salinity intrusions found in areas near fronts. The physical nature of each of these two phenomena and existing models of their effects on propagation will be reviewed. The possibility of using high-frequency acoustics to remotely examine and map intrusions via double-diffusive microstructure scattering will also be examined. The anisotropy of the coastal internal wave field will be discussed, and subsequent acoustic propagation anisotropy will be examined using data from the multi-PI Shallow-Water 2006 experiment in the Mid-Atlantic Bight. [Research supported by the Office of Naval Research] |
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© Woods Hole Oceanographic Institution © University of Washington |
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| Last updated May 2010 |