Impactos de Barramentos na Morfodinâmica da Foz do Rio Malcozinhado, Cascavel- Ceará - Brasil

Abstract

The estuary of the Malcozinhado River is a estuary-lagoon system located at 70 km from Fortaleza, Ceará’s coastal eastern state. With an area of approximately 5 km² which is a plains of sandy-clay sediments accumulation of the Quaternary. The processes morfodinamics the mouth are controlled by the interaction of processes such as migration of dunes, construction of dams and transport in coastal drift. From studies of remote sensing and trackpoints using GPS was possible to evaluate the changes and quantify the rates of erosion and progradation of the coastline of estuary and beach between 2004 and 2008 and their correlation with the reduction of tributary flow due to construction of Malcozinhado’s Public Dam in 2002. The rate of erosion of the margin west of Águas Belas Beach was in the order of 7.5 m / year. In the strip of beach adjacent was verified retreat of 230 m. In the east margin was established with contributions from silting predominantly marine sediments. The rates of progradation ranged from 33 and 60 m / year, giving the same environment of a high risk for instability and expansion of the urban net.