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UNIVERSIDADE FEDERAL DO CEARÁ (2007)

Regularization of flow in reservoirs through models of bi-monthly and seasonal : the duration of dry season and evaporation of the proposal equivalent

Cavalcante Filho, Ernani Cleiton

Titre : Regularization of flow in reservoirs through models of bi-monthly and seasonal : the duration of dry season and evaporation of the proposal equivalent

Regularização de vazões em reservatórios através dos modelos mensal e bi-sazonal : a duração da estação seca e a proposta da evaporação equivalente

Auteur : Cavalcante Filho, Ernani Cleiton

Université de soutenance : Universidade Federal do Ceara

Grade : Mestrado em Engenharia Civil 2007

Résumé
The Brazilian Semi-Arid Region is marked by physical and climatic factors that influence directly in the survival of the population. The irregular pluviometric regimen, the high taxes of evaporation and the crystalline ground predominance make the Ceará a satiated State of intermittent rivers. x the reservoirs are calculeted to regularize outflows with random character. In this context, the Method of the Monte Carlo Simulation becomes a tool of great importance. The method generates synthetic series of annual outflows, breaks up these outflows in monthly outflows (Method Fragments) and makes the simulated operation of the resevoir. The research makes a comparison enters two models of operation of reservoirs : the monthly model and the bi-sazonal model, to discover which the evaporation equivalent (Eeq.) in the two models that originates one same regularized outflow (Q90) and its duration (months). Also was argued the influence of the modulation of the water withdrawals in the reservoir. For in such a way the Monte Carlo Method was applied in the sizing of the outflows regularized for the two models in 50 reservoirs from the State of the Ceará. Were verified that 5% the values of Q90 for the operated monthly model with constant withdrawals was bigger on average, that the values of the outflows of the modulated monthly model. In the Semi-Arid Region of the State the values of the Eeq evaporation reached its bigger values, approximately 2400mm/ano in the Inhamuns, arriving around 750mm/ano in the monutains regions (humid and semi-humid tropical climate). For the dry station, it was observed that the June to January station if adjusted to the semi-arid hot tropical climate, while stations shorter as August to December was a characteristic of weak climate, as for example the coast of the State (semi-humid tropical climate).

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