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TITLE : WIND DEPENDENCE AND SEASONAL VARIATION OF AMBIENT NOISE IN SHALLOW WATER OF ARABIAN SEA  
AUTHORS : Vijayabaskar V      Rajendran V            
ABSTRACT :

Ambient noise data were collected from shallow water of Arabian sea using two sensitive hydrophones suspended from the measuring platform at the depth of 5 m and 12 m where the ocean depth was 17 m. Datas were collected for the period of six months between the wind speed 0.5 m/s to 7 m/s. The collected datas were categorised according to seasons. The analyses were performed between the frequencies 500 Hz to 7 KHz for premonsoon and post monsoon seasons. The relative spectral energy distribution of sea noise is presented for a number of wind speeds. Linear relationship between the sea noise spectrum levels and the wind speed were found for the entire frequency range, but the slope were frequency dependent. The analysis was performed for premonsoon and post monsoon seasons. In this paper we also presented Empirical Mode Decomposition (EMD) based noise analysis, which will be useful for denoising.

Keywords: Ambient noise, shallow water, wind dependence, Empirical Mode Decomposition (EMD), noise analysis.
 
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