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Hydrodynamic modeling over a sand wave field at São Marcos Bay, Brazil
Samaritano, L.; Chagas, F.M.; Bernardino, J.C.M.; Siegle, E.; Tessler, M.G.; Uemura, S. (2013). Hydrodynamic modeling over a sand wave field at São Marcos Bay, Brazil, in: Van Lancker, V. et al. (Ed.) MARID 2013: Fourth International Conference on Marine and River Dune Dynamics. Bruges, Belgium, 15-17 April 2013. VLIZ Special Publication, 65: pp. 241-247
In: Van Lancker, V.; Garlan, T. (Ed.) (2013). MARID 2013: Fourth International Conference on Marine and River Dune Dynamics. Bruges, Belgium, 15-17 April 2013. VLIZ Special Publication, 65. Royal Belgian Institute of Natural Sciences/SHOM/Flanders Marine Institute (VLIZ): Oostende. ISBN 978-2-11-128352-7. 338 pp., meer
In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950, meer

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  • Samaritano, L.
  • Chagas, F.M.
  • Bernardino, J.C.M.
  • Siegle, E.
  • Tessler, M.G.
  • Uemura, S.

Abstract
    Sand wave studies indicate that flow patterns and local hydrodynamic regime are essential elements to determinate orientation, asymmetry, height and migration of subaqueous features. The goal of this work is to characterize the small scale hydrodynamics that control sediment transport at São Marcos Bay, along Ponta da Madeira Port Complex, at São Luís (Maranhão state, NE Brazil). Numerical modeling was based on bathymetric campaigns, topographic data, sediment samples and 4 velocity ADCP monitoring stations along east margin of the bay. Tidal levels reach 7.0 m high, 3.5 m being the mean value and 6.0 m the mean high water level, producing overall ebb dominated strong currents that reach up to 3 m/s on ebb spring tides. Neap currents are weaker and reach 1.9 m/s and 2.0 m/s on flood and ebb tides, respectively. Local morphology determinates the occurrence of intense gyres, which allied to absolute sediment availability, dominate by fine sand, allows 0.5 m to 6.0 m sand waves height development.

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