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Contribution à l'étude de la qualité des eaux des retenues amazoniennes : application de la modélisation mathématique à la retenue de Tucurui (Brésil)

Abstract : The development of hydroelectric power in Amazonia has created many reservoirs. The reservoir water quality is subject to modifications due to different factors among them the decomposition of the submerged terrestrial vegetation seems predominant. We tried to integrate these factors into a model to study the evolution of reservoir water quality. This model describes, on the longitudinal and vertical dimensions of the reservoir, the behaviour of five state variables: dissolved oxygen, organic matter in the water column, easily degradable organic matter, poorly degradable organic matter, and ammonium. This behaviour is described in aerobic and anaerobic conditions. The physical compartiment of the model uses two approaches to the longitudinal description of the reservoir. The first one uses a one-dimensional temperature model with a horizontal box discretization. The second uses a one-dimensional temperature model with a description of the inflow intrusion into the reservoir. The model is calibrated and validated on the Tucurui (Brazil) reservoir data base. The results indicate a correct simulation of the stratification and destrafication periods, as well as the evolution of the oxygen and ammonium concentrations. This modelling demonstrates the important part played by the decomposition of trunks and branches in the evolution of reservoir water quality. Indeed, their degradation causes a strong oxygen depletion while ammonium release is weak.
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Submitted on : Friday, February 25, 2011 - 11:20:54 AM
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Alice Pereira. Contribution à l'étude de la qualité des eaux des retenues amazoniennes : application de la modélisation mathématique à la retenue de Tucurui (Brésil). Hydrologie. Ecole Nationale des Ponts et Chaussées, 1994. Français. ⟨pastel-00569488⟩

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