Analysis of the stratification in the Guadiana estuary

L. Pinto, A. Oliveira, A. B. Fortunato, Antonio Baptista

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

The construction of new dams in the Guadiana River (Portugal/Spain) motivated the analysis of the hydrodynamics of its estuary under strong river flows. The main objectives were to determine under which combinations of river flow and tidal amplitudes stratification occurs, and to characterize the velocity and salinity structure under these conditions. High-resolution numerical simulations were performed using a three-dimensional baroclinic model (ELCIRC) with a level 2.5 Mellor and Yamada turbulence closure scheme. Field data collected in the scope of this study were used both to validate the model and to complement the analysis of the estuarine behavior. The data were adequately reproduced and results were consistent with theory. Model results also provided additional details on the spatial distribution of salinity. For instance, the model shows that stratification decreases near the tip of the salt wedge at the end of flood. Some empirical criteria to predict stratification conditions were shown to be inadequate for the Guadiana estuary. Both data and model results were used to verify the hypothesis that pelagic organisms able to migrate vertically during the tidal cycle can take advantage of the baroclinic circulation to remain in the estuary even at high river flows. Although residual velocities are directed seaward at all depths, it was shown that, under stratified conditions, the vertical phase lags in the velocity field are sufficient to allow an organism with vertical migration capabilities to move upstream.

Original languageEnglish (US)
Title of host publicationProceedings of the International Conference on Estuarine and Coastal Modeling
EditorsM.L. Spaulding
Pages1094-1113
Number of pages20
StatePublished - 2004
EventEstuarine and Coastal Modeling - Proceedings of the Eighth International Conference - Monterey, CA, United States
Duration: Nov 3 2003Nov 5 2003

Other

OtherEstuarine and Coastal Modeling - Proceedings of the Eighth International Conference
CountryUnited States
CityMonterey, CA
Period11/3/0311/5/03

Fingerprint

Estuaries
stratification
estuary
Rivers
river flow
salinity
tidal cycle
vertical migration
Spatial distribution
Dams
Turbulence
Hydrodynamics
turbulence
dam
hydrodynamics
analysis
Salts
spatial distribution
salt
Computer simulation

ASJC Scopus subject areas

  • Engineering(all)
  • Earth and Planetary Sciences(all)

Cite this

Pinto, L., Oliveira, A., Fortunato, A. B., & Baptista, A. (2004). Analysis of the stratification in the Guadiana estuary. In M. L. Spaulding (Ed.), Proceedings of the International Conference on Estuarine and Coastal Modeling (pp. 1094-1113)

Analysis of the stratification in the Guadiana estuary. / Pinto, L.; Oliveira, A.; Fortunato, A. B.; Baptista, Antonio.

Proceedings of the International Conference on Estuarine and Coastal Modeling. ed. / M.L. Spaulding. 2004. p. 1094-1113.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Pinto, L, Oliveira, A, Fortunato, AB & Baptista, A 2004, Analysis of the stratification in the Guadiana estuary. in ML Spaulding (ed.), Proceedings of the International Conference on Estuarine and Coastal Modeling. pp. 1094-1113, Estuarine and Coastal Modeling - Proceedings of the Eighth International Conference, Monterey, CA, United States, 11/3/03.
Pinto L, Oliveira A, Fortunato AB, Baptista A. Analysis of the stratification in the Guadiana estuary. In Spaulding ML, editor, Proceedings of the International Conference on Estuarine and Coastal Modeling. 2004. p. 1094-1113
Pinto, L. ; Oliveira, A. ; Fortunato, A. B. ; Baptista, Antonio. / Analysis of the stratification in the Guadiana estuary. Proceedings of the International Conference on Estuarine and Coastal Modeling. editor / M.L. Spaulding. 2004. pp. 1094-1113
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