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This is study of resistance to the injection of an organic load into the estuarine zone of a major source in the Metropolitan Region of Fortaleza (CE), here involving the River Cocó. For this a program was developed in C++, to simulate flow and dispersion of pollutants in a specific river reach that is under the direct influence of the tide. To simulate flow, a form of the Saint-Venant equations was used, with the appropriate contour conditions. In numerical resolution, an explicit scheme of finite differences was applied, in this case that of MCCORMACK. Once the flow profiles had been calculated, the Advection-Dispersion (AD) equation was used, with a 1st order decay factor to simulate mass transport of BOD (Biochemical Oxygen Demand). The program developed applied a pseudospectral method with an explicit time step. The results found for flow show the good fit of the MCCORMACK scheme to estuarine situations, where the tidal movement makes the flux go in one direction at one time, and in the opposite direction the next. On the other hand, the results of A-D show the sensitivity of the spectral methods to the contour conditions imposed. .. Key-words: spectral method, method of finite differences, estuaries, water quality, River Cocó (CE).

Aplicação de Método Espectral em Grade Não-Uniforme na Avaliação de Dispersão de Poluentes no Rio Cocó em Fortaleza-CE