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Shallow water wave spectral characteristics along the eastern Arabian Sea

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  • V. Kumar
  • P. Shanas
  • K. Dubhashi

Abstract

The spectral characteristics of shallow water waves were studied at two locations along the eastern Arabian Sea during 2011. Wave spectra were single-peaked from June to October and predominantly double-peaked during the rest of the year. Even though both locations were subjected to open sea conditions, the percentage of single-peaked spectra was large (63 %) in the southern location compared to a location 350 km north (46 %), because of variation in local winds. Throughout the year, the double-peaked spectra were mostly swell dominated in the southern location. In the northern location, the double-peaked spectra during January to May and December were sea dominated due to the strong local winds blowing from north-west. For the double-peaked wave spectra, the average difference between the spectral peaks was 0.11 Hz, and the average ratio of the spectral energy density at the two peaks was 0.5. Significant wave heights up to 4.2 m and a maximum wave height of 7 m were observed during the south-west monsoon period. Fifty per cent of the waves recorded had spectral peak wave periods between 6 and 12 s. The narrowest directional spectra were found for waves with 10–12-s peak wave periods. Inverse wave age values were biased towards lower values with peaks in the range of 0.2–0.6, indicating a swell-driven wave regime along the eastern Arabian Sea. Copyright Springer Science+Business Media Dordrecht 2014

Suggested Citation

  • V. Kumar & P. Shanas & K. Dubhashi, 2014. "Shallow water wave spectral characteristics along the eastern Arabian Sea," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 70(1), pages 377-394, January.
    • Handle: RePEc:spr:nathaz:v:70:y:2014:i:1:p:377-394
    DOI: 10.1007/s11069-013-0815-7
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    Cited by:

    1. T. Muhammed Naseef & V. Sanil Kumar & Jossia Joseph & B. K. Jena, 2019. "Uncertainties of the 50-year wave height estimation using generalized extreme value and generalized Pareto distributions in the Indian Shelf seas," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 97(3), pages 1231-1251, July.
    2. Sisir Kumar Patra & Pravakar Mishra & P. K. Mohanty & U. K. Pradhan & U. S. Panda & M. V. Ramana Murthy & V. Sanil Kumar & T. M. Balakrishnan Nair, 2016. "Cyclone and monsoonal wave characteristics of northwestern Bay of Bengal: long-term observations and modeling," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 82(2), pages 1051-1073, June.

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