Nowadays, Port of Santos is the largest in Latin America, and it is undergoing a process of deepening of its access channel and, as its final target, is expected to attain 17 m. A considerable increase in the maintenance dredging volume is expected, particularly for the section of the maritime sandbar that is, currently, only maintained by dredging. Consequently, this study employed numerical modeling to propose an efficient layout for two curved, current-guiding jetties for the transposition of the maritime sandbar of Port of Santos navigation channel, and it's evaluated their efficiency in maintaining depths throughout the channel. Therefore, it was used only the hydrodynamic model of Mike 21 to compare the results with the physical modeling realized in the same simulation conditionals. The results indicate, in both approaches, the current velocities increased with the proposal jetties. Thus, the accomplished study indicates that the adoption of permanent constructions for transposition of the maritime sandbar of the Port of Santos is clearly feasible and it could constitute a more economically attractive option for maintaining depths of 17 m than the current one.Keywords: Costal and Port Engineer; Jetties; Numerical modeling; Dredging.
RESUMOAtualmente o Porto de Santos é o maior da América Latina, e encontra-se em processo de aprofundamento de seu canal de acesso prevendo alcançar a profundidade de 17,0 m como meta final. Especificamente para o trecho da barra marítima que hoje é mantida somente por dragagem, espera-se um incremento significativo no volume de dragagem de manutenção. Neste sentido, este trabalho empregou a modelagem matemática para verificar a eficiência da construção de dois molhes guia -corrente curvos para a transposição da barra marítima do canal do Porto de Santos e avaliar sua eficiência na manutenção das profundidades no canal. Foi utilizado o módulo hidrodinâmico do software Mike 21 para que os resultados pudessem ser comparados aos obtidos em modelação física nas mesmas condições de simulação. Os resultados apontaram que, assim como os resultados obtidos em modelo físico, ocorre incremento das velocidades das correntes com a introdução dos molhes propostos indicando ser plenamente viável a adoção de obras fixas para a transposição da barra marítima do Porto de Santos, podendo configurar-se como uma opção economicamente mais atraente do que a atual, para manter profundidades de 17,0 m.
Traditionally, reduced physical models are used to allow control, instrumentation and experimental evaluation of flow. More recently, computational fluid dynamics (CFD) has emerged as a tool that allows numerical modeling of flows and can complement the information provided by the physical model. The objective this paper is to validate the CFD tool in reproducing the flow through an ogee crest spillway with a roller bucket stilling basin. This validation was performed with the data from a reduced scale experiment in which measurements were made of the position of the water free surface and of the pressure loads in the spillway profile. It was verified that the CFD tool is suitable for the study of this type of flow, being able to reproduce the experimental results. In the execution of the numerical simulations, special attention was given to the influence of the mesh on the results. An important influence of the mesh was observed in some results, which shows the importance a sensitivity analysis of this parameter when performing CFD simulations. The obtained results offer the prospect of using CFD as a supporting tool for the design of spillways and stilling basins.
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