i-manager Publications

Estimation of vertical coherence of ship Generated noise in the Bay of Bengal region

V. G. Sivakumar*, V. Rajendran**

* Research Scholar, Sathyabama University, Chennai.

** Professor, Departments of Physics/ ECE SSN College of Engineering, Kalavakkam, Chennai.

Periodicity:February - April'2013
DOI : https://doi.org/10.26634/jfet.8.3.2221

Abstract

The Bay of Bengal sea area near by Chennai carries considerable amount of shipping. This mostly originates from traffic to and from the other major ports of India. Shipping noise is the most influence of ambient noise in shallow water areas close to shipping narrow ways . Shipping noise is most evident in the 50-300 Hz frequency range. Shallow water region acts as a high pass filter, with the cut-off frequency increasing as the water get shallower. There is an multiple bottom reflection encountered in shallow water region .So the spatial structure of the ambient noise field strongly depends on the geo acoustic properties of the seabed. The vertical directionality and coherence are stable feature of the ambient noise, which are determined by the seabed. These properties are not varied due to the surface source distribution. The ambient noise field in shallow water region is highly complex due to the waveguide nature of the shallow water environment. The automatic ambient noise measurement system deployed in shallow water region of the Bay of Bengal was used to determine the vertical coherence of ship generated noise. In this paper the vertical coherence for different sea state, level of spectrum and effect of ship noise forcing on coherence pattern are presented.

Keywords

Acoustic, Coherence, Ambient Noise, Surface Noise.

How to Cite this Article?

Sivakumar , V.G., and Rajendran , V. (2013). Estimation of Vertical Coherence of Ship Generated Noise in The Bay of Bengal Region. i-manager’s Journal on Future Engineering and Technology, 8(3), 41-46. https://doi.org/10.26634/jfet.8.3.2221

References

[1]. Dr.Ing Dietrick Wittekind (2009). “Challenges of ship technology” Germen Society of marine Technology.

[2]. Robert J. Uric (1983). “Principles of Underwater sound 1983 Edition.

[3]. C H Harrison (1995). Formulas for ambient noise level and coherence. J. Acoust. Soc. Am., 99(4), 2055-2066.

[4]. Carbone N M, Deane G B and Buckingham M J (1997). Estimating the compressional and shear wave speeds of a shallow water seabed from the vertical coherence of ambient noise in the water column. J. Acoust. Soc. Am., 103(2), 801-813.

[5]. Wysocki, L. E., and F. Ladich (2005a). Hearing in fishes under noise conditions. Journal of the Association in Research in Otolaryngology. 6, 28-36.

[6]. Sanjana M.C., Latha. G., and V. Rajendran (2009). Vertical cohrence of ambient noise in shallow water of bay of bengal. Pro.sympol 2009.

[7]. Ramji, S., Latha, G., Rajendran, V., & Ramakrishnan, S. (2008). Wind dependence of ambient noise in shallow water of Bay of Bengal, Applied Acoustics, 69, 1294-1298.

[8]. Paul A. van Walree, Jeffrey. A, Newham, Marco Shriver (2007). Coherent acoustic communication in tidal estuary with busy hipping traffic. J. Acoust. Soc.Am, 122(6). Dec 2007.

[9]. Urick, R.J. (1984). Ambient noise in the sea. Peninsula Publishing; 1984.

	North Americas,UK, Middle East,Europe		India	Rest of world
	USD	EUR	INR	USD-ROW
Pdf	35	35	200	20
Online	35	35	200	15
Pdf & Online	35	35	400	25

Estimation of vertical coherence of ship Generated noise in the Bay of Bengal region

Abstract

Keywords

How to Cite this Article?

References

If you have access to this article please login to view the article or kindly login to purchase the article

Purchase Instant Access

Options for accessing this content: