VARIAÇÕES TEMPORAIS E ESPACIAIS NA DINÂMICA DE SEDIMENTAÇÃO DA PRAIA DE ARMAÇÃO - SALVADOR/BA

FÉLIX FERREIRA DE FARlAS, ABÍLIO CARLOS DA SILVA PINTO BITTENCOURT, ADEMAR ZANINI JÚNIOR, JOSÉ MARIA LANDIM DOMINGUEZ

Resumo


The Armação beach constitutes a high-energy environment in which erosive phases displace sediment amounts comparable to those observed on beaches subjected to eevere storm actíon such as on the east coast of the United States. Sand envelopes up to 3m thick have been measured. This ís attributed to fall and winter cold fronts that, although not storm-productíng, are se frequent as to carry out equivalent geological work. As a result of a local time-reversing coastal drift, the two ends of the beach exhibit, in general, opposite and tíme-alternating behaviour with ao erosive phase at one end corresponding to a constructive on at the other. A significant exchange of material between the beach face and the shoreface has been observed along the Armação beach except for the portíon near its NE extremety where the presence of shallow submerged rock outcrops prevents it. The dynamics of sedimentatíon at the Armação beach is controlled by the type of wave and the angle wíth which it reaches the beach. Although the swell waves are generated at the southernmost Atlantic Ocean, all the others derive from the local wínd regime.

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