Coastline changes and sedimentation related with the opening of an artificial channel: the Valo Grande Delta, SE Brazil

Autor(es)

de Mahiques, Michel M. ^[1] ; Figueira, Rubens C. L. ^[1] ; Alves, Daniel P. V. ^[1] ; Italiani, Diana M. ^[1] ; Martins, Cristina C. ^[2] ; Dias, Joao M. A. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Oceanog, BR-05508190 Sao Paulo - Brazil

^[2] Fundacao Estudos & Pesquisas Aquat FUNDESPA, BR-05507000 Sao Paulo - Brazil

^[3] Univ Algarve, P-8005139 Faro - Portugal

• Tipo de documento: Artigo Científico
• Fonte: Anais da Academia Brasileira de Ciências; v. 86, n. 4, p. 1597-1607, DEC 2014.
• Citações Web of Science: 5

Resumo

The role played by human activity in coastline changes indicates a general tendency of retreating coasts, especially deltaic environments, as a result of the recent trend of sea level rise as well as the blockage of the transfer of sediments towards the coast, especially due to the construction of dams. This is particularly important in deltaic environments which have been suffering a dramatic loss of area in the last decades. In contrast, in this paper, we report the origin and evolution of an anthropogenic delta, the Valo Grande delta, on the south-eastern Brazilian coast, whose origin is related to the opening of an artificial channel and the diversion of the main flow of the Ribeira de Iguape River. The methodology included the analysis of coastline changes, bathy metry and coring, which were used to determine the sedimentation rates and grain-size changes over time. The results allowed us to recognize the different facies of the anthropogenic delta and establish its lateral and vertical depositional trends. Despite not being very frequent, anthropogenic deltas represent a favorable environment for the record of natural and anthropogenic changes in historical times and, thus, deserve more attention from researchers of different subjects. (AU)

• Processo FAPESP: 06/04344-2 - O registro geológico da atividade antrópica no sistema estuarino-lagunar de Cananéia-Iguape
• Beneficiário: Michel Michaelovitch de Mahiques
• Modalidade de apoio: Auxílio à Pesquisa - Regular