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| Titel |
Co-existence of wind seas and swells along the west coast of India during non-monsoon season |
| VerfasserIn |
R. Rashmi, V. M. Aboobacker, P. Vethamony, M. P. John |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 9, no. 2 ; Nr. 9, no. 2 (2013-03-08), S.281-292 |
| Datensatznummer |
250018036
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| Publikation (Nr.) |
 copernicus.org/os-9-281-2013.pdf |
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| Zusammenfassung |
| An attempt has been made to understand the co-existence of wind seas and
swells along the west coast of India during non-monsoon season. Wave data
were collected in different years during non-monsoon season (off Goa during
May 2005, off Ratnagiri during January–February 2008 and off Dwarka during
December 2007–January 2008), which is fairly a calm weather season along
these regions. Diurnal variation in wave parameters is noticeable along the
central west coast of India (off Goa and Ratnagiri), which is due to the
interaction of multidirectional waves (both wind seas and swells) of varying
magnitudes and frequencies. Swells are predominantly mature (91%) and
old (88%) during late pre-monsoon and post-monsoon seasons,
respectively. Sea Swell Energy Ratio quantifies wind sea, swell and mixed
seas prevailing in these regions during non-monsoon season. Intermodal
distance (ID) between the energy peaks is moderately separated during
non-monsoon season, whereas, during the shamal events, energy peaks are very
close to each other (ID ∼ 0). However, pure wind seas (ID ∼ 1)
are weakly present and found to co-exist with the swells almost all the time
during non-monsoon season. Wind sea growth has been found while the swell
propagates opposite to the direction of the wind and wind sea. Wind seas have
minimum angular spreads in multimodal state. Under low winds, the interaction
between wind sea and swell dominates and thereby the multimodal state reduces
to unimodal state. The fetch available for the evolution of the wind sea
spectrum has been estimated, and it is found to be less than 150 km. For the
fetch limited condition, a non-dimensional empirical relation has been
derived relating the significant wind sea height in terms of wind speed and
peak wind sea period, and this relation fits for the west coast of India. |
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