Abstract
The present work estimated the conditions of infilling of the Jacuipe estuary, located in the north coast of Bahia, using geochronology 137Cs and 210Pb combined methods and verification of accommodation sediments spaces still exist. Two sedimentation rates were identified in this estuary more less 70 years old. The first, from 3,7 mm y-1, refers to the natural conditions of sedimentation that occurred until the mid-1960s, and the second, more recent, is probably due to anthropogenic influences in the watershed which increased the contribution sediments to 6,0 mm y-1. It was estimated that Jacuipe estuary, with the remaining accommodation space of 6.97 x 10(6) m³ , can be completely filled in less than 300 years. This time interval may drop by half if it continues the current rate of sedimentation and hydrological changes of confirmation provided in this basin
Highlights
Recent sedimentation rates derived from 210Pb and 137Cs methods and infilling estimate of the Jacuipe estuary, Bahia, Brazil
The present work estimated the conditions of infilling of the Jacuipe estuary, located in the north coast of Bahia, using geochronology 137Cs and 210Pb combined methods and verification of accommodation sediments spaces still exist
The first, from 3,7 mm y-1, refers to the natural conditions of sedimentation that occurred until the mid-1960s, and the second, more recent, is probably due to anthropogenic influences in the watershed which increased the contribution sediments to 6,0 mm y-1
Summary
Taxas de sedimentação recentes provenientes dos métodos Cs137 e Pb210 e estimativa de preenchimento do estuário Jacuípe, Bahia, Brasil. Resumo O presente trabalho estimou as condições de preenchimento do estuário Jacuípe, localizado no litoral norte da Bahia, utilizando-se os métodos geocronológicos combinados Pb210 e Cs137 e a verificação dos espaços de acomodação de sedimentos ainda existentes. A primeira, de 3,7 mm ano-1, refere-se às condições naturais de sedimentação que ocorrera até meados da década de 1960 e, a segunda, mais recente, é provavelmente devido à influência antropogênica na bacia hidrográfica, que aumentou o aporte de sedimentos para a bacia, de 6,0 mm ano-1. Estimou-se que o estuário do Jacuípe, com espaço de acomodação restante, de 6,97 x 106 m3, pode ser totalmente preenchido em menos de 300 anos. Palavras-chave: preenchimento estuarino, taxas de sedimentação, geocronologia Cs137 e Pb210
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