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Tidal frequency dynamics of a Southern Brazil coastal lagoon: Choking and short period forced oscillations
Authors:Osmar O Möller  Patrice Castaing  Elisa Helena Leão Fernandes  Pascal Lazure
Institution:1.Laboratório de Oceanografia Física, Departmamento de Física,Funda??o Universidade Federal do Rio Grande (FURG),Rio Grande,Brazil;2.Université Bordeaux I, Départment de Géologie et Océanographie,U. M. R. EPOC 5805 Centre National de la Recherche Scientifique,Talence Cedex,France;3.Direction de l’Environment Littoral, Service des Applications Operationelles,Institute Fran?ais de Recherche pour l’Exploitation de la Mer,Plouzané,France
Abstract:The Patos Lagoon is a choked, microtidal coastal laggon situated in southern Brazil between 30°S and 32°S. The response of the lagoon to tidal oscillations is studied through data analysis and numerical modeling experiments. Two types of high frequency oscillations are observed in the tidal frequency band: mixed tides, predominantly diurnal; and forced oscillations having a period of 24 h occurring in the inner lagoon. In the southern portion of the lagoon, tides are selectively filtered by the entrance channel. The main diurnal constituent O1 is linearly attenuated as it progresses landwards. In the inner parts of the lagoon, 24-h oscillations are mainly forced by the combined effect of diurnal tides and sea breeze action. They are tied with a natural period of oscillation of 24 h. Results also indicate that these are not inertial frequency oscillations, despite the lagoon being placed in a critical 30°S area. The interaction between astronomical tides and meteorological effects produces a complicated picture for tidal forecasting derived from data collected inside the lagoon.
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