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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 34, issue 2
Ann. Geophys., 34, 215–226, 2016
https://doi.org/10.5194/angeo-34-215-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 34, 215–226, 2016
https://doi.org/10.5194/angeo-34-215-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 12 Feb 2016

Regular paper | 12 Feb 2016

Changes in nearshore waves during the active sea/land breeze period off Vengurla, central west coast of India

M. M. Amrutha, V. Sanil Kumar, and J. Singh M. M. Amrutha et al.
  • Ocean Engineering Division, Council of Scientific & Industrial Research-National Institute of Oceanography, Dona Paula, Goa 403 004 India

Abstract. A unique feature observed in the tropical and subtropical coastal area is the diurnal sea-breeze/land-breeze cycle. We examined the nearshore waves at 5 and 15 m water depth during the active sea/land breeze period (January–April) in the year 2015 based on the data measured using the waverider buoys moored in the eastern Arabian sea off Vengurla, central west coast of India. Temporal variability of diurnal wave response is examined. Numerical model Delft3D is used to study the nearshore wave transformation. The wave height increased due to the sea breeze and reached its peak at  ∼ 13:00 UTC at 15 m water depth, whereas the peak significant wave height is at 12:00 UTC at 5 m water depth. Due to the influence of the land/sea breeze system, the range of the peak wave period in 1 day varied up to 8 s. Reduction in the wave height of wind-sea is around 20 % and that of the swell is around 10 % from 15 to 5 m water depth.

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The nearshore wave characteristics are presented during the active sea/land breeze period based on data measured at 5 m and 15 m water depth in the eastern Arabian Sea. Prior to the sea breeze, the wave field is dominated by swell and during the sea breeze, wind-sea dominates with superimposed swell. Reduction in the wave height of wind-sea is around 20 % and that of the swell is around 10 % from 15 m to 5 m water depth.
The nearshore wave characteristics are presented during the active sea/land breeze period based...
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