Variations in Swells along Eastern Arabian Sea during the Summer Monsoon

Glejin Johnson, V. Sanil Kumar, Sajiv Philip Chempalayil, Jai Singh, Premanand Pednekar, K. Ashok Kumar, G. Udhaba Dora, Rajamanickam Gowthaman

Ocean Engineering, CSIR-National Institute of Oceanography (Council of Scientific & Industrial Research), Dona Paula, India.

DOI: 10.4236/ojms.2012.22006                

Abstract

A study was carried out to find the variation in wave characteristics along the eastern Arabian Sea and the influence of swells in the nearshore waves at 3 locations during summer monsoon in 2010. Percentage of swells in the measured waves was 75% to 79% at the locations with higher percentage of swells in the northern portion of Arabian Sea com-pared to that at the southern side. The significant wave height up to 4.7 m and maximum wave height up to 7.4 m was observed. The wave height was increasing from south to north with the average significant wave height at the northern location 20% more than that at the southern location due to the increase in the swell height. Waves having spectral peak period less than 6 s were not present during the summer monsoon period. There was no change in the average value of wave statistical parameters for data collected at 1/2, 3, 6, 12 and 24 h interval.

Keywords

Seas; Swells; Wind Waves; Arabian Sea; Mixed Sea State; Wave Spectrum

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	V. S. Kumar, N. M. Anand, K. A. Kumar and S. Mandal, “Mul-tipeakedness and Groupiness of Shallow Water Waves along Indian Coast,” Journal of Coastal Research, Vol. 19, No. 4, 2003, pp. 1052-1065.
[2]	V. S. Kumar, S. Philip and T. N. B. Nair, “Waves in Shallow Water off West Coast of India during the Onset of Summer Monsoon,” Annales Geophysicae, Vol. 28, 2010, pp. 817-824. doi:10.5194/angeo-28-817-2010
[3]	V. S. Kumar, J. Singh, P. Pednekar and R. Gowthaman, “Waves in the Nearshore Waters of Northern Arabian Sea during the Summer Monsoon,” Ocean Engineering, Vol. 38, No. 2-3, 2011, pp. 382-388. doi:10.1016/j.oceaneng.2010.11.009
[4]	V. S. Kumar, K. C. Pathak, P. Pednekar and R. Gowthaman, “Coastal Processes along the Indian Coastline,” Current Science India, Vol. 91, No. 4, 2006, pp. 530-536.
[5]	F. B. Stephen and T. Kollstad, “Field Trials of the Directional Waverider,” Proceedings of the 1st International Offshore and Polar Engineering Conference, Edinburgh, 11-16 August 1991, pp. 55-63.
[6]	M. S. Longuet-Higgins, “On the Joint Distribution of the Periods and Amplitudes of Sea Waves,” Journal of Geophysical Research, Vol. 80, No. 18, 1975, pp. 2688-2694. doi:10.1029/JC080i018p02688
[7]	A. J. Kuik, G. Vledder and L. H. Holthuijsen, “A Method for the Routine Analysis of Pitch and Roll Buoy Wave Data,” Journal of Physical Ocean-ography, Vol. 18, No. 7, 1988, pp. 1020-1034. doi:10.1175/1520-0485(1988)018<1020:AMFTRA>2.0.CO;2
[8]	J. Portilla, F. J. Ocampo-Torres and J. Monbaliu, “Spectral Partitioning and Identification of Wind Sea and Swell,” Journal of Atmospheric and Oceanic Technology, Vol. 26, No. 1, 2009, pp. 117-122. doi:10.1175/2008JTECHO609.1
[9]	M. A. Donelan, “The Effect of Swell on the Growth of Wind Waves,” Johns Hopkins APL Technical Digest, Vol. 8, No. 1, 1987, pp. 18-23.
[10]	P. D. Bromirski, D. R. Cayan and R. E. Flick, “Wave Spectral Energy Variability in the Northeast Pacific,” Journal of Geophysical Research, Vol. 110, 2005, Article ID: C03005. doi:10.1029/2004JC002398
[11]	Y. Goda, “On the Methodology of Selecting Design Wave Height,” Proceedings 21st Coastal Engineering Conference, ASCE, New York, 20-25 June 1988, pp. 899- 913.
[12]	M. Allen and J. Callaghan, “Extreme Wave Conditions for the South Queensland Coastal Region,” Environment Technical Report, Environmental Protec-tion Agency, Queensland, Vol. 32, 1999, pp. 1-7.