TITLE

Trade wind intensification and hurricanes on a Caribbean Beach, Martinique Island: a comparison of their morphological impacts from fieldexperiments and numerical simulations

AUTHOR(S)
Rousset, H.; Monfort, O.; Levoy, F.; Flageollet, J. C.; Bosser, K.
PUB. DATE
June 2000
SOURCE
Journal of Coastal Research;Summer2000, Vol. 16 Issue 3, p877
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The impacts of Trade Wind intensification and moderate hurricanes onbeach sediment balance have been analysed from a study of time variations of the sediment volume of Bagasse Beach and its shoreface, on the island of Martinique (French West Indies). Field experiments (wavecharacteristics, longshore current velocity, bathymetric and topographic surveys) conducted at different time scales show a negative dry season sediment budget and a slightly positive annual budget for thismicrotidal beach. Volumetric variations computed for one day of Trade Wind intensification appear to represent about twice those for one dry season. This analysis reveals that the influence of moderate hurricanes (coastal wave heights less than 2.5 m) on the long-term (2 yr)sediment balance is weak. In order to compare these high-energy events, numerical simulations have been carried out. Comparison between moderate hurricane conditions and a Trade Wind intensification event shows that the latter is responsible for more important volumetric erosion by about 23%. At a daily scale, moderate hurricanes have a larger power of erosion, 40 m3 m-1 day-1 versus 28 m3 m-1 day-1 for a Trade Wind intensification event. However, hurricane waves last only a few hours to 2 days, while waves generated by Trade Winds last, on average, 3-4 days. This study clearly highlights the importance of Trade Wind intensification events on the short-term (order of days) evolution of this beach.
ACCESSION #
8216535

 

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