Análise da estratificação no canal de acesso ao Porto de Vitória e na Baía de Vitória-ES
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Data
2020-05-27
Autores
Lobo, Gabriela Machado
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Universidade Federal do Espírito Santo
Resumo
Mathematical modeling is used in several engineering subjects. Particularly in Environmental Engineering, considering bodies of water with a surface, this modeling is used to understand the estuary’s hydrodynamics. The present work aims to investigate the stratification at the Port of Vitória access channel and at Vitória Bay-ES using computational fluid dynamics methodology. To obtain the hydrodynamics, three-dimensional Navier-Stokes equations for incompressible fluid were used. In parallel, to calculate temperature and salinity transport, an advection-diffusion equation was used. In the dynamics of movement, long wave and Boussinesq approximations were considered, as well as the equation of state to calculate specific mass. The the tool used to obtain hydrodynamics, salinity and temperature was Delft3D-FLOW model. Statistical parameters were calculated to analyze the model's hydrodynamics response. Two scenarios, which differ only in the consideration of barotropic and baroclinic forcing, were analyzed and both obtained a good response. A comparison between the statistical parameters of the different scenarios was made. Bearing in mind that the baroclinic scenario is able to represent the specific mass variation, and that the response of both scenarios was similar and satisfactory, the scenario that was used for the stratification analysis was the baroclinic. Regarding stratification, the Richardson number (Ri) was calculated in two cross sections: one at Vitória Bay (section A); and another at Port of Vitória access channel (section B). The results show that, in both sections, there was a predominance of Richardson number values below 0,25 during spring tide, and during neap tide there was a predominance of values greater than 0,25. Therefore, the Richardson number results at the Port of Vitória access channel and at Vitória Bay-ES indicate that during neap tide the water column is stratified, and during spring tide the water column is partially mixed.
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Hidrodinâmica , Efeito baroclínico , Delft3D-FLOW