ABSTRACT.A hydrodynamic characterization of the Itapocu river and Barra Velha lagoon estuarine system was carried out with the objective of evaluating how the current regime in this area is affected by astronomical and meteorological tides and the river discharge. Meteorological, water level and current velocity and direction data were gathered hourly during a twenty-day period, from 22-July until 10-August, 2004. Current meters were positioned at the inlet, at the entrance of the north and south lagoons and at the lower estuary of the river along with a tide gauge. The estuarine system showed distinct current behavior among the different sectors within the estuary, responding to the different forcings. The strongest currents were observed at the inlet while the weakest values were observed at the northern lagoon, a location that showed little dynamic. The general flow was ebb-dominated flux, in response to fluvial discharge, even during local wind water set-up event.Keywords: circulation, hydrography, river discharge, tides, estuary. RESUMO. Uma caracterização hidrodinâmica do sistema estuarino do rio Itapocu e Lagoa de Barra Velha foi realizada com objetivo de avaliar como o regime decorrentesé afetado pela maré astronômica e meteorológica, e pela descarga fluvial. Dados meteorológicos, nível daágua e correntes foram registrados em intervalos horários durante um período de vinte dias, entre 22 de julho até 10 de agosto de 2004. Os correntógrafos foram posicionados na desembocadura, nas conexões do estuário com as lagoas norte e sul, e no baixo estuário, juntamente com um marégrafo. O sistema estuarino apresentou comportamento de correntes diferenciado entre as diversas localizações, em respostaàs diferentes forçantes. As correntes mais intensas foram registradas na desembocadura, e as mais fracas na lagoa norte, local que apresentou uma hidrodinâmica muito reduzida. O escoamento apresentou fluxo residual de vazante, em respostaà descarga fluvial, mesmo durante eventos de subida do nível do mar causados pelo vento.Palavras-chave: circulação, hidrografia, descarga fluvial, maré, estuário.
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