On the effect of tidal flats on the hydrodynamics of the Tagus estuary

André B. Fortunato, Anabela Oliveira, Antonio Baptista

Research output: Contribution to journalArticle

55 Citations (Scopus)

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 energy filters, rather than sinks, transferring energy from astronomic to non-linear frequencies. They 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 lengthens the duration of ebbs, decreasing sediment flushing and further increasing accretion.

Original languageEnglish (US)
Pages (from-to)31-44
Number of pages14
JournalOceanologica Acta
Volume22
Issue number1
DOIs
StatePublished - Jan 1999

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tidal flat
hydrodynamics
estuaries
accretion
estuary
sediment deposition
energy
flushing
sediment
shallow water
filter
sediments
duration
effect
water

Keywords

  • Numerical model
  • Tagus estuary
  • Tidal flats
  • Tidal propagation

ASJC Scopus subject areas

  • Aquatic Science
  • Oceanography

Cite this

On the effect of tidal flats on the hydrodynamics of the Tagus estuary. / Fortunato, André B.; Oliveira, Anabela; Baptista, Antonio.

In: Oceanologica Acta, Vol. 22, No. 1, 01.1999, p. 31-44.

Research output: Contribution to journalArticle

Fortunato, André B. ; Oliveira, Anabela ; Baptista, Antonio. / On the effect of tidal flats on the hydrodynamics of the Tagus estuary. In: Oceanologica Acta. 1999 ; Vol. 22, No. 1. pp. 31-44.
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