Portal de Periódicos da CAPES

DINÂMICA DE MARÉ E TRANSPORTE DE SEDIMENTOS NO CANAL DE ITAJURU - LAGUNA DE ARARUAMA (RJ)

1991; Sociedade Brasileira de Geologia; Volume: 21; Issue: 4 Linguagem: Inglês

10.25249/0375-7536.1991378386

2177-4382

GUILHERME C. LESSA,

Geography and Environmental Studies

AT ITAJURU CHANNEL -ARA-RUAMA LAGOON (RJ).The Itajuru channel, located in the Eastern side of the Araruama lagoon (Rio de Janeiro State), is probably the unique inverse estuarine system along the Southeast and South Brazilian coast The position of the sedimentary deposits, the hypersaline characteristics of the lagoon and its small catchment area, induced the idea that the flood currents might have more transport capacity than ebb currents.Field works carried out in summer 1988 and winter 1989 indicated the propagation of an asymmetrical tide, associated, however, with stronger flux of water ami sedirnent during ebb tide.The results seems to be related with a period of more humid climate, when the normal negative hydrological balance turns to be positive.The consequence has been an increase of the lagoon level and a set up of a pressure gradient towards the sea, with the predominance of the ebb currents.