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Seasonal Variation in Nearshore Wave Characteristics off Cuddalore, Southeast Coast of Tamil Nadu, India


Affiliations
1 Coastal and Environmental Engineering Division, National Institute of Ocean Technology, Pallikaranai, Chennai 600 100, India
 

Wave data collected using wave rider buoy between January 2010 and January 2011 off Cuddalore coast, Tamil Nadu, India, have been analysed season-wise in this study. Wave steepness method was used for the separation of sea and swell wave parameters. Also parameters such as significant wave height of total wave, sea and swell (Hs, Hsw and Hss), zero crossing periods (Tz, Tsw and Tss) and mean wave directions (θ, θsw and θss) have been studied. The study shows a distinct shift in sea wave direction of about 90° between June and October as well as November and February. Throughout the year, the predominant swell direction remained around 135°. The contribution in total Hs by Hsw was 76% and the remaining 24% by Hss in the yearly cycle. The sea wave height was dominant by more than 90% during November to May. Regression analysis showed good positive Pearson's correlation of 0.94 between Hs and Hsw; however, it was 0.65 between Hs and Hss. The maximum and significant wave heights of 5.7 and 2.7 m were recorded during cyclone Jal on 7 November 2010.

Keywords

Regression Analysis, Seasonal Variation, Spectral Energy Density, Wave Characteristics.
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  • Seasonal Variation in Nearshore Wave Characteristics off Cuddalore, Southeast Coast of Tamil Nadu, India

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Authors

Basanta Kumar Jena
Coastal and Environmental Engineering Division, National Institute of Ocean Technology, Pallikaranai, Chennai 600 100, India
Sisir K. Patra
Coastal and Environmental Engineering Division, National Institute of Ocean Technology, Pallikaranai, Chennai 600 100, India
K. Jossia Joseph
Coastal and Environmental Engineering Division, National Institute of Ocean Technology, Pallikaranai, Chennai 600 100, India
K. M. Sivakholundu
Coastal and Environmental Engineering Division, National Institute of Ocean Technology, Pallikaranai, Chennai 600 100, India

Abstract


Wave data collected using wave rider buoy between January 2010 and January 2011 off Cuddalore coast, Tamil Nadu, India, have been analysed season-wise in this study. Wave steepness method was used for the separation of sea and swell wave parameters. Also parameters such as significant wave height of total wave, sea and swell (Hs, Hsw and Hss), zero crossing periods (Tz, Tsw and Tss) and mean wave directions (θ, θsw and θss) have been studied. The study shows a distinct shift in sea wave direction of about 90° between June and October as well as November and February. Throughout the year, the predominant swell direction remained around 135°. The contribution in total Hs by Hsw was 76% and the remaining 24% by Hss in the yearly cycle. The sea wave height was dominant by more than 90% during November to May. Regression analysis showed good positive Pearson's correlation of 0.94 between Hs and Hsw; however, it was 0.65 between Hs and Hss. The maximum and significant wave heights of 5.7 and 2.7 m were recorded during cyclone Jal on 7 November 2010.

Keywords


Regression Analysis, Seasonal Variation, Spectral Energy Density, Wave Characteristics.

References





DOI: https://doi.org/10.18520/cs%2Fv112%2Fi10%2F2115-2121