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Discussion papers | Copyright
https://doi.org/10.5194/os-2017-84
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 16 Nov 2017

Research article | 16 Nov 2017

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This discussion paper is a preprint. A revision of the manuscript for further review has not been submitted.

Characteristics of high monsoon wind-waves observed at multiple stations in the eastern Arabian Sea

M. M. Amrutha and V. Sanil Kumar M. M. Amrutha and V. Sanil Kumar
  • Ocean Engineering Division, CSIR – National Institute of Oceanography, Dona Paula 403 004, Goa, India

Abstract. The growth and decay of surface wind-waves during one-month period in a typical Indian summer monsoon is investigated based on the data collected at 9 to 15m water depth at 4 locations in the nearshore waters of the eastern Arabian Sea covering a spatial distance of ~350km. The significant wave height varied from 0.7 to 5.5m during the data collection considered in the analysis. The heights of waves during the measurement period often exceed 3m. The most extreme wave height is 1.50 to 1.62 times the significant wave height and the most extreme crest height of the wave is 1.23 to 1.35 times the significant wave height of the same 30-minutes record. The average ratio of crest height of the wave to the height of the same wave is 0.58 to 0.67. The height of waves having maximum crest height is smaller than the maximum wave height during 30minutes period. Measured waves are predominantly swell, but since the majority of wave generation during the monsoon is adjacent to the study area and the wind–wave coupling is strong, wave periods are rarely above 15s. The numerical wave model could estimate the wave height reasonably well during the wave growth compared to the wave decay period. Hovmöller diagrams show a considerable spatial variability in the wave and wind pattern in the Indian Ocean during the high wave event at the eastern Arabian Sea.

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M. M. Amrutha and V. Sanil Kumar
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M. M. Amrutha and V. Sanil Kumar
M. M. Amrutha and V. Sanil Kumar
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Short summary
Surface wind-waves properties during Indian summer monsoon is investigated based on measured data at 9-15 m water depth at 4 sites in nearshore waters of the eastern Arabian Sea. Significant wave height varied from 0.7 to 5.5 m with average ratio of crest height of wave to height of the same wave as 0.58 to 0.67. Extreme crest height is 1.23 to 1.35 times significant wave height. Measured waves were predominantly swell. Numerical wave model could estimate the wave height well during wave growth.
Surface wind-waves properties during Indian summer monsoon is investigated based on measured...
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