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Application of a Beach Plan Evolution Model in Sergipe, Brazil

by Otavio J. Sayao, Atria Engineering Hydraulics Inc, Mississauga, Canada,
K. C. Ander Chow, Atria Engineering Hydraulics Inc, Mississauga, Canada,



Document Type: Proceeding Paper

Part of: Coastal Engineering Practice

Abstract:

An offshore breakwater 543 m long located at about 2.4 km from the shore at 10 m of water depth (above chart datums) provides protection to a liquid bulk terminal (Terminal Portuarlo de Sergipe, TPS) near Barra dos Coqueiros, Sergipe, Brazil. Another detached breakwater 100 m long is located at about 750 m from shore at 5 m of water depth of protect small craft. During the TPS construction phase, the formation of a salient was observed, with sedimentation in the lee of the breakwaters in a relatively short period of time. The objectives of this paper were to evaluate the impact of the TPS structures on the dynamics of the beach and to predict the evolution of the shoreline at the TPS due to wave action, by means of numerical simulation. A numerical model of beach plan evolution was developed and used, based on Perlin and Dean (1983) and Resio (1988). The calibration phase of the model included the use of existing site data. The model was run to predict the impact of each individual structure on the shoreline during construction as well as the impact of all structures on the littoral evolution. The n-lines model proved to be a powerful tool for the prediction of short term beach evolution at the TPS site. The simulation results showed that the influence of the offshore breakwater on shoreline changes is not negligible.

Subject Headings: Coastal protection structures | Breakwaters | Coastal management | Beaches | Shoreline protection | Sediment transport | Numerical models | Brazil | South America

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