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- Title
Impact of internal waves on the acoustic field at a coastal station off Paradeep, east coast of India.
- Authors
Sridevi, B.; Ramana Murty, T.; Sadhuram, Y.; Murty, V.
- Abstract
Internal Wave (IW) characteristics and the impact of IW on acoustic field have been studied utilizing the hourly time series of temperature and salinity data collected at a coastal site off Paradeep (north Bay of Bengal) during 24-25 October 2008. The IW characteristics, viz. period ( t), velocity ( C), wavelength ( L), and wave numbers ( k), are found to be 2.133-34.72 h, 0.135 km h, 0.37-6.2 km and 2.70-0.16 cycles km, respectively. The semi-diurnal tidal forces are predominant than diurnal as well as at other frequencies and its contribution is about 64% towards the total potential energy ( E = 3.34 J m). Sound velocity perturbations with space and time in the presence of IW field are examined from Garrettt-Munk (GM) model. Transmission loss anomaly for optimized source-receiver configuration at the depth of 53 m and range of 9 km has been computed from acoustic modelling. The loss in the acoustic transmission is found to be 38.4 dB in the presence of low-frequency IW field.
- Subjects
BENGAL (India); INDIA; INTERNAL waves; OCEAN tomography; ACOUSTIC models; BAYS
- Publication
Natural Hazards, 2011, Vol 57, Issue 3, p563
- ISSN
0921-030X
- Publication type
Article
- DOI
10.1007/s11069-010-9567-9