Long-term wave characteristics off Trivandrum

G. Muraleedharan, N.U. Nair, P.G. Kurup


The available atlases of averaged visual wave statistics of the Arabian Sea provide wave information which differ from one another. A comparative study of the long-term distributions of significant wave height obtained from these atlases is made for an area off Trivandrum. The long-term distributions of significant wave height are tested with Weibull, Gumbel, Rayleigh, Exponential and Log-normal models. The best fit is obtained for Weibull probability density function. Over estimated of peak percentage frequency of occurrence of wave heights amount to less than 11% and under estimates less than 13%. The return period of the maximum significant wave height (7.5 m) obtained from N.P.O.L. atlas is 2.27 years and that from N.I.O. atlas (5.0 m) is 1.71 years. Average maximum significant wave heights to occur in a 5 year period are computed using Weibull model for combined sea and swell statistics separately. Nearly 95% waves lie in the height range 0-3.25 m. The most frequently occurring wave heights for overall and monsoon data are 0.75 and 1.00 m (grid 17), 1.33 and 1.75 m (grid 1) respectively


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