International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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Characteristics of long-period swells measured in the near shore regions of eastern Arabian Sea

  • Glejin, Johnson (Ocean Engineering Division, CSIR-National Institute of Oceanography, Council of Scientific & Industrial Research) ;
  • Kumar, V. Sanil (Ocean Engineering Division, CSIR-National Institute of Oceanography, Council of Scientific & Industrial Research) ;
  • Amrutha, M.M. (Ocean Engineering Division, CSIR-National Institute of Oceanography, Council of Scientific & Industrial Research) ;
  • Singh, Jai (Ocean Engineering Division, CSIR-National Institute of Oceanography, Council of Scientific & Industrial Research)
  • Received : 2015.10.27
  • Accepted : 2016.03.28
  • Published : 2016.07.30
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Abstract

Measured wave data covering two years simultaneously at 3 locations along the eastern Arabian Sea reveals the presence of long-period (peak wave period > 18 s) low-amplitude waves (significant wave height < 1 m) and the characteristics of these waves are described in this article. In a year, 1.4-3.6% of the time, the low-amplitude long-period swells were observed, and these waves were mainly during the nonmonsoon period. The wave spectra during these long-period swells were multi-peaked with peak wave period around 18.2 s, the secondary peak period around 13.3 s and the wind-sea peak period at 5 s. The ratio of the spectral energy of the wind-sea peak and the primary peak (swell) was slightly higher at the northern location (0.2) than that at the southern location (0.15) due to the higher wind speed present at the northern location.

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References

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