Variation In Wave Steepness and Wave Age-A Case Study in The Arabian Sea from Buoy Measurements During Post-Monsoon

Year : 2025 | Volume : 12 | Issue : 02 | Page : 10-21
    By

    M. Kalyani,

  • Vengatesan G,

  • Sridharan R,

  • Biswajit H,

  • Jossia Josph K,

  • Arul Muthuah M,

Abstract

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The National Institute of Ocean Technology (NIOT) moored buoy measurements in the Central Arabian Sea (AS) at AD07 location (68.87 E, 15.07 N) during the year 2015 are utilized to understand wind and wave growth characteristics at this location during the post- monsoon season covering the three-month period from October to December (OND). The wave direction followed the wind from Northeast while the swells were predominantly from the Southern Indian Ocean (SIO) from distant storms. This season is characterized by low to medium wind and wave conditions with the peak period (Tp) exhibiting two distinct peaks in sea and swell ranges. The wave age and wave steepness are evaluated from the data which are important to understand the wind-wave growth with energy balance equation of significant waves. The buoy algorithm separates sea and swell at 10 s, and hence, the results are presented for the two cases for Tp less than 10s (wind sea range) and for Tp more than 10 s (swell range). It is found that 32.5 % are old swells, 6.7 %, are mature swells, 46.6 % are young swells and only 14.3 % are wind seas at AD07 during post-monsoon season. As there were no cyclones that influenced AD07 during this period (Chapala & Megh were away from AD07 and had landfall on Gulf coast, no impact at AD07) the swells predominantly are from the SIO. In addition, the available empirical relationship on wave steepness and wave age based on the 3/2 power law for wind seas is compared for the present study and found to follow the trend. A new coefficient is derived for AD07 location in the unobstructed deep waters for post-monsoon season. The empirical relationship developed between the non-dimensional wave height and wave period in the shallow waters of AS is compared with present data. A similar relationship with modified coefficient for deep waters is derived AD07 in the central AS for post-monsoon season.

Keywords: Buoy, Arabian sea, post-monsoon, wave steepness; wave age, empirical relationship

[This article belongs to Journal of Offshore Structure and Technology ]

How to cite this article:
M. Kalyani, Vengatesan G, Sridharan R, Biswajit H, Jossia Josph K, Arul Muthuah M. Variation In Wave Steepness and Wave Age-A Case Study in The Arabian Sea from Buoy Measurements During Post-Monsoon. Journal of Offshore Structure and Technology. 2025; 12(02):10-21.
How to cite this URL:
M. Kalyani, Vengatesan G, Sridharan R, Biswajit H, Jossia Josph K, Arul Muthuah M. Variation In Wave Steepness and Wave Age-A Case Study in The Arabian Sea from Buoy Measurements During Post-Monsoon. Journal of Offshore Structure and Technology. 2025; 12(02):10-21. Available from: https://journals.stmjournals.com/joost/article=2025/view=0


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Regular Issue Subscription Original Research
Volume 12
Issue 02
Received 27/03/2025
Accepted 04/04/2025
Published 07/04/2025
Publication Time 11 Days
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