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Variations in long term wind speed during different decades in Arabian Sea and Bay of Bengal
Volume 119 Issue 5 October 2010 pp 639-653
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Fulltext
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Permanent link:
https://www.ias.ac.in/article/fulltext/jess/119/05/0639-0653 -
Keywords
Extreme value ;NECP/NCAR data ;north Indian Ocean ;Weibull distribution ;Gumbel distribution. -
Abstract
A study has been carried out by comparing the extreme wind speeds estimated based on NCEP/NCAR reanalysis data for 100 years return period using Fischer Tippet-1 (commonly known as Gumbel)and Weibull distributions for three locations (off Goa,Visakhapatnam and Machilipatnam)in the north Indian Ocean.The wind dataset for Goa is compared with that from ERA-40 data.For higher wind speeds ($12-20 m s^{−1}$ ),NCEP wind speed has higher percentage of occurrence than that of ERA-40.Analysis has shown slight upward trend in the annual maximum wind for location off Machilipatnam with an increase of $1.2cms^{−1}$ per year and a decreasing trend of $−1.3cms^{−1}$ per year in the case of Goa.The Weibull distribution with shape parameter 2 fits the annual maximum wind data better than FT-1 distribution.
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Author Affiliations
V Sanil Kumar1 C Sajiv Philip1
- Ocean Engineering, National Institute of Oceanography, Goa 403 004, India.
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Dates
- Published
- October 2010
- Manuscript received
- 29 November 2009
- Manuscript revised
- 24 June 2010
- Accepted
- 29 June 2010
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