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Title: On the effect of tidal flats on the hydrodynamics of the Tagus estuary
Authors: Fortunato, A. B.
Oliveira, A.
Melo Baptista, A.
Issue Date: 1999
Publisher: Oceanologica Acta
Series/Report no.: ******
Abstract: The effects of tidal flats on the hydrodynamics of the Tagus estuary are analysed using an accurate high-resolution shallow water model, supported by field data. Tidal flats act mainly as filters, rather than sinks, transferring energy from astronomic to non-linear frequencies. Tidal flats also play a major role in determining the strong resonance mode that amplifies semi-diurnal constituents. We show that the upper estuary, with extensive tidal flats, has an increasing accretion rate. This "filling-up" results from a positive feedback between sediment deposition and the hydrodynamics: accretion in the upper estuary increases the duration of ebbs, decreasing sediment flushing, and further increasing accretion.
Appears in Collections:DHA/NEC - Comunicações a congressos e artigos de revista

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