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On the dominance of pre-existing swells over wind seas along the west coast of India

DRS at CSIR-National Institute of Oceanography

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Title On the dominance of pre-existing swells over wind seas along the west coast of India
 
Creator Aboobacker, V.M.
Rashmi, R.
Vethamony, P.
Menon, H.B.
 
Subject wave data
spectral analysis
Tropical storm
swell
 
Description Wave data collected off Goa along the west coast of India during February 1996–May 1997 has been subjected to spectral analysis, and swell and wind sea parameters have been estimated by separation frequency method. Dominance of swells and wind seas on monthly and seasonal basis has been estimated, and the analysis shows that swells dominate Goa coastal region not only during southwest monsoon (93%), but also during the post-monsoon (67%) season. Wind seas are dominant during the pre-monsoon season (51%). The mean wave periods (Tm) during southwest monsoon are generally above 5 s, whereas Tm is below 5 s during other seasons. Co-existence of multiple peaks (from NW and NE) was observed in the locally generated part of the wave spectrum, especially during the post-monsoon season. NCEP reanalysis winds have been used to analyse active fetch available in the Indian Ocean, from where the predominant swells propagate to the west coast of India. A numerical model was set up to simulate waves in the Indian Ocean using flexible mesh bathymetry. The correlation coefficients between measured and modelled significant wave heights and mean wave periods are 0.96 and 0.85, respectively. Numerical simulations reproduced the swell characteristics in the Indian Ocean, and from the model results potential swell generation areas are identified. The characteristics of swells associated with tropical storms that prevail off Goa during 1996 have also been analysed.
 
Date 2011-09-29T06:30:43Z
2011-09-29T06:30:43Z
2011
 
Type Journal Article
 
Identifier Continental Shelf Research, vol.31; 2011; 1701-1712
no
http://drs.nio.org/drs/handle/2264/3926
 
Language en
 
Relation Cont_Shelf_Res_31_1701.jpg
 
Rights An edited version of this paper was published by Elsevier. Copyright [2011] Elsevier
 
Publisher Elsevier