Navegando por Autor "Lopes, Bruno Vasconcellos"

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Estudo numérico de derrames de óleo na região do Super Porto De Rio Grande - RS
(2018) Lopes, Bruno Vasconcellos; Marques, Wiliam Correa
The impossibility of eliminating risks of accidents involving oil spills stresses the importance in establishes fast action protocols against these eventual disasters, mainly in harbor zones. In this study sixty simulations with different scenarios for oil spill events were simulated in different envi- ronmental conditions at the harbor zone of the city of Rio Grande - RS. The simulations were made using the numerical system Telemac-3D + ECOS. The hydrodynamic simulation period was of 365 days corresponding to the daily means calculated for the period between the years of 2003 and 2015. The hydrodynamic validation for the month of January of 2011 showed satisfactory results. The me- ans were used in order to simulate the main processes in the hydrodynamic circulation. The oil spills simulations, spaced over 365 days, were used to identify the main forces controlling the oil particles movement and its final destination. The trend of the movement of oil particles is due the combination of winds, currents and water discharge from the Patos lagoon tributary rivers. During summer and spring with predominant Northeast winds and low river discharges, 100% of the simulations showed that a fraction of the oil particles reaches the Super Porto zone (R1). In 17.9% of the simulations, a fraction of the oil particles reaches the Saco da Mangueira (R10). Moreover, during autumn and winter when winds vary in direction and river discharges are maximum, 60% of simulations showed that oil particles reach the R1 zone; 40% suggest they reach the salt marshes region (R6); 30% reach the inlet groins (R3) and 16.7% suggest the oil particles leaved the estuarine domain (R12). With high river discharge or low wind intensity, the current have great influence percentage ratio in the oil particles displacement. The wind action is main force for the oil particles to reach the estuarine shore because of the varying directions of it, while the current have dominance at the access channel to the Patos lagoon in a longitudinal orientation. The regions R1, Barra Nova (R2), and the tip of regions Q. section (R5), R6 and São José do Norte (R7) showed high contamination by oil spills. In weathering, the oil emulsification response showed great results however, the evaporation process were super esti- mated by the model. The different scenarios of flood/ebb regime and different direction and intensity of winds generate distinct interactions over the oil particles trajectories that can intensify or slow down the displacement velocity of the particles. Lastly, the ECOS model showed satisfactory results for the oil spill displacement providing the results of susceptibility to touch of oil at the estuarine shore. The regions R5 and R6 are the reach points of oil spills that present great oil concentration and the most dangerous scenarios. presenting a high sensitivity index (ISL 10). Therefore, this study results can support actions in case of accidents involving oil spills at the Super Porto region.