Wave observations in the Mahanadi basin (Bay of Bengal) during September 1980

A.A. Fernandes, A.D. Gouveia, P.V. Sathe, R. Nagarajan

Abstract



The sea state at the location 20 degrees 21'E, 87 degrees 10'N (40 m depth) is described for the periods September 7-11, 1980 (calm) and September 16-18, 1980 (stormy) from the results of spectral analysis and wave by wave analysis of hourly wave records obtained with a shipborne wave recorder on board R V Gaveshani. Wave parameters computed from the two methods are compared. Spectra for the period Sept. 7-11, 1980 reveal two peaks at periods around 16 sec and 8 sec, both owing to 'swell', while the spectra for the period Sept. 16-18, 1980 show a single peak at a period around 8 sec (slowly moving towards lower frequency) owing to 'sea'. The significant wave height, Hmo and the zero crossing period Tm/01 computed from spectral analysis overestimates H1/3 by 8% and underestimates Tz by about 20% respectively

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