Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30521
Sedimentary Response to Coastal Defense Works in São Vicente Bay, São Paulo

Authors: L. C. Ansanelli, P. Alfredini

Abstract:

The article presents the evaluation of the effectiveness of two groins located at Gonzaguinha and Milionários Beaches, situated on the southeast coast of Brazil. The effectiveness of these coastal defense structures is evaluated in terms of sedimentary dynamics, which is one of the most important environmental processes to be assessed in coastal engineering studies. The applied method is based on the implementation of the Delft3D numerical model system tools. Delft3D-WAVE module was used for waves modelling, Delft3D-FLOW for hydrodynamic modelling and Delft3D-SED for sediment transport modelling. The calibration of the models was carried out in a way that the simulations adequately represent the region studied, evaluating improvements in the model elements with the use of statistical comparisons of similarity between the results and waves, currents and tides data recorded in the study area. Analysis of the maximum wave heights was carried to select the months with higher accumulated energy to implement these conditions in the engineering scenarios. The engineering studies were performed for two scenarios: 1) numerical simulation of the area considering only the two existing groins; 2) conception of breakwaters coupled at the ends of the existing groins, resulting in two “T” shaped structures. The sediment model showed that, for the simulated period, the area is affected by erosive processes and that the existing groins have little effectiveness in defending the coast in question. The implemented T structures showed some effectiveness in protecting the beaches against erosion and provided the recovery of the portion directly covered by it on the Milionários Beach. In order to complement this study, it is suggested the conception of further engineering scenarios that might recover other areas of the studied region.

Keywords: Coastal Engineering, Coastal Erosion, Sao Vicente bay, Delft3D, coastal engineering works

Digital Object Identifier (DOI): doi.org/10.6084/m9.figshare.12489884

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 98

References:


[1] L. C. Van Rijn, J. S. Ribberink, J. Van Der Werf, & D. J. Walstra. Coastal sediment dynamics: recent advances and future research needs. Journal of hydraulic research, 51(5), 475-493. 2013.
[2] P. Alfredini, A. Pezzoli, E. Arasaki, “Impact of climate changes on the Santos Harbor, São Paulo State (Brazil)”. TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, v. 7, n. 4, 2013, pp. 609–617.
[3] A. Farinaccio; G. S. V. Cazolli; M.G. Tessler. “Variações da linha de costa nas baías de Santos e São Vicente”. Quaternary and Environmental Geosciences, v.1, 2009, pp. 42-48.
[4] Deltares. User Manual Delft3D-FLOW. Simulation of Multi-Dimensional Hydrodynamic and Transport Phenomena, Including Sediments. Deltares, Delft, The Netherlands. 2018, pp. 702-704.
[5] Saha et al. The NCEP Climate Forecast System Version 2. Journal of Climate, 27, 2185–2208. doi: http://dx.doi.org/10.1175/JCLI-D-12-00823.1. 2014.
[6] G. D. Egbert, A. F. Bennett, M. G. Foreman. TOPEX/POSEIDON tides estimated using a global inverse model. Journal of Geophysical Research: Oceans, v. 99, n. C12, 1994, pp. 24821-24852.
[7] G. D. Egbert, S. Y. Erofeeva. “Efficient inverse modeling of barotropic ocean tides”. Journal of Atmospheric and Oceanic Technology, v. 19, n. 2, 2002, pp. 183-204.
[8] H.L. Tolman. User manual and system documentation of WAVEWATCH-III version 1.15. NOAA/NWS/NCEP/OMB Technical Note 151, 1997, pp 97.
[9] H.L. Tolman. User manual and system documentation of WAVEWATCH-III version 1.18. NOAA/NWS/NCEP/OMB Technical Note 166, 1999, pp 110.
[10] H.L. Tolman. User manual and system documentation of WAVEWATCH-III version 2.22. NOAA/NWS/NCEP/MMAB Tech. Note 222, 2002, pp. 133.
[11] H.L. Tolman. User manual and system documentation of WAVEWATCH-III version 3.14. NOAA/NWS/NCEP/OMB Technical Note 276, 2009, 194 pp, + Appendices.
[12] V.A.P. Alexandre. “Análise morfodinâmica das praias arenosas de São Vicente/SP”. Bachelor Thesis. Universidade de Mont Serrat. 2010.
[13] C.J. Willmott. “Some comments on the evaluation of model performance”. American Meteorological Society Bulletin, 1982, pp. 1309-1313.
[14] J. Willmott, D. E. Wicks. “An Empirical Method for the Spatial Interpolation of Monthly Precipitation within California”, Physical Geography, 1:1,59-73, DOI:10.1080/02723646.1980.10642189. 1980.
[15] D.H. Muehe. Erosão e Progradação do Litoral Brasileiro. Brasília, Ministério Meio Ambiente, 2006, pp. 476-478.
[16] C. Pianca, P.L.F. Mazzini, E. Siegle. Brazilian offshore wave climate based on WW3 reanalysis. Braz. J. Oceanogr., 2010, pp. 53–70.
[17] US Army Corps of Engineer, Shore Protection Projects. In: Coastal Engineering Manual, 2002, Cap. 3. p. 2-4.
[18] P. Cugier; P Le Hir. “Development of a 3D Hydrodynamic Model for Coastal Ecosystem Modelling. Application to the Plume of the Seine River (France)”. Estuarine, Coastal and Shelf Science, Elsevier Science, 2002.
[19] C.R.G. Souza, F.O. Barbosa. “Taxas de Recuo da Praia do Gonzaguinha (São Vicente-SP) no Período de 1962 a 2001, baseadas em Fotografias Aéreas. Belém, PA”. In: XI Congresso da Associação Brasileira de Estudos do Quaternário – ABEQUA, Belém, PA, 4 a 11 de novembro de 2007. Anais, CD-ROM. 2007.