REFLEXO DAS VARIAÇÕES MORFODINÂMICAS PRAIAIS NAS CARACTERÍSTICAS TEXTURAIS DOS SEDIMENTOS DA PRAIA DA ARMAÇÃO, SALVADOR, BAHIA

ABÍLIO CARLOS DA SILVA PINTO BITTENCOURT, FÉLIX FERREIRA DE FARIAS, ADEMAR ZANINI JÚNIOR

Resumo


Monitoring of two beach profiles at the extreme ends of the Armação Beach in Salvador, Bahia, during the period of March/1982 to September/1984, has revealed that their most significant morphodynamic changes are also reflected in sediment textural features such as th e median, the 1% percentile (C), and sorting. Both profiles exhibit a cyclic evolutionary trend characterized by three well defined, closely synchronous, stages (I , II, and III). In stages I and III, related to the arrival of cold-fronts to the area, distinctly high values for the median and for C as well as low values for the sorting are reached in the two profiles. In addition, inasmuch as the highest values of the median and C along with the lowest of sorting were recorded in the profile of the beach section subjected to more wave turbulence, these textural parameters served also to discriminate the two studied beach portions on the basís of their energy levels. No correlation has been found between skewness and the main morphologic variations. This is believed to result from the obliteration of the major, seasonal changes by the daily, small ones.

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