Period and length of high surface gravity waves measured in the coastal waters of eastern Arabian Sea and its variations in 10 years

Abstract

Information on the period and length of waves is required for the planning and design of marine facilities and wave energy converters. In this article, the period and length of the waves measured during the peak monsoon (June–July) in the coastal waters of the eastern Arabian Sea for 10 years are examined. The most typical wave periods (T) are within 3.9 s and 5.5 s and about 25 % are above 9 s. The peak wave period (Tp) indicates that during the peak monsoon months, long-period waves dominate the eastern Arabian Sea. Significant wave period and integral wave period show a good linear relationship with energy wave period with a slope value close to 1. There are inter-annual variations of up to 15 % in the 90-percentile value of the Tp. From 2010 to 2019, the average wavelength during peak monsoon varied from 61.3 m to 67.6 m and the maximum wavelength from 216.6 m to 248.8 m. Interannual variations in the 90-percentile values for wavelength corresponding to maximum wave height is only 7 %.