Impact of internal waves on sound propagation off Bhimilipatnam,east coast of India |
| |
| Authors: | B Sridevi TV Ramana MurtyY Sadhuram MMM RaoK Maneesha S Sujith KumarPL Prasanna |
| |
| Institution: | National Institute of Oceanography, Regional center, 176, Lawsons Bay Colony, Visakhapatnam 530 017, India |
| |
| Abstract: | Internal waves (IW) are identified off Bhimilipatnam, east coast of India, from the time series CTD (hourly interval) and thermistor chain data (2 min interval) collected during 23–25 Feb 2007. The measurements were carried out at 94 m water depth on the continental shelf edge. These data sets are used to describe the characteristics of IW and their impact on acoustic fields. Garrett and Munk (GM) model has been used to predict the characteristics of low frequency (LF) IW with space and time. Active IW are seen in the layers 54 m–94 m with a velocity of 0.548 km h−1 and the wavelengths of the order of 0.03 km–21.8 km. The model could capture the IW features in the thermocline region accurately than at the bottom. This could be due to the limitation of the model which considers linearity. High frequency IW observed at the bottom could be due to the advection of tidal currents over the shallow irregular bottom in the presence of stratification. The study emphasizes linear IW rather than transient non-linear waves induced by tidal interaction with topography. |
| |
| Keywords: | Low frequency Internal waves Thermistor chain GM model Acoustic simulation East coast of India |
| 本文献已被 ScienceDirect 等数据库收录！ |
