Impact of sea breeze on wind-seas off Goa, west coast of India |
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| Authors: | S Neetu Satish Shetye P Chandramohan |
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| Institution: | (1) Physical Oceanography Division, National Institute of Oceanography, Dona Paula, 403 004 Goa, India;(2) Indomer Coastal Hydraulics (P) Ltd, Ragamalika, Kumran Colony Main Road, Vadapalani, 600 026 Chennai, India |
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| Abstract: | After withdrawal of the Indian Summer Monsoon and until onset of the next monsoon, i.e., roughly during November–May, winds
in the coastal regions of India are dominated by sea breeze. It has an impact on the daily cycle of the sea state near the
coast. The impact is quite significant when large scale winds are weak. During one such event, 1–15 April 1997, a Datawell
directional waverider buoy was deployed in 23 m water depth off Goa, west coast of India. Twenty-minute averaged spectra,
collected once every three hours, show that the spectrum of sea-breeze-related ‘wind-seas’ peaked at 0.23 ±0.05 Hz. These
wind-seas were well separated from swells of frequencies less than 0.15 Hz. The TMA spectrum (Bouwset al 1985) matched the observed seas spectra very well when the sea-breeze was active and the fetch corresponding to equilibrium
spectrum was found to be 77±43 km during such occasions. We emphasize on the diurnal cycle of sea-breeze-related sea off the
coast of Goa and write an equation for the energy of the seas as a function of the local wind |
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| Keywords: | Wind-wave sea breeze coastal processes energy density spectra Arabian Sea |
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