Ambient Noise Vertical Directionality and Reflection Loss Estimates for a Shallow Tropical Site with a Fast Sound Speed Bottom |
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| Authors: | M C Sanjana G Raguraman G Latha |
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| Institution: | 1. Ocean Acoustics and Modelling, National Institute of Ocean Technology, Chennai, Tamil Nadu, Indiasanjana@niot.res.in;3. Ocean Acoustics and Modelling, National Institute of Ocean Technology, Chennai, Tamil Nadu, India |
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| Abstract: | AbstractFor high frequency ocean acoustic modeling applications, seabed reflection loss is a useful alternative input compared to conventional geoacoustic model parameters. Reflection loss can be estimated by comparing the noise intensity of the up and down components of the ambient noise vertical directionality pattern. The potential of this method is demonstrated with experimental data spanning one week, collected off shallow east coast of India using a 21 element vertical hydrophone array. The compact and easily operable vertical array has been designed for high frequency directionality estimation in the band 2–10?kHz. The ambient noise data are beam formed to arrive at the vertical directionality pattern. Further reflection loss values as a function of frequency and grazing angle have been estimated for 1/3 octave bands for a sandy sea bed in warm tropical waters. This has been compared with modeled reflection loss estimates using OASR reflection loss module of OASES. This will serve as inputs to propagation models for applications such as inverse techniques, ambient noise modelling, and sonar system performance prediction. |
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| Keywords: | Reflection loss vertical directionality vertical hydrophone array |
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