Avaliação dos impactos gerados pela operação datomada d’água no reservatório Castanhão.

• Ano de defesa: 2022
• Autor(a) principal: Oliveira, Luísa Ciríaco Silva de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Tomada de água; Reservatórios; Fluidodinâmica computacional; Água - Qualidade
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/69050

Dam operations can generate significant repercussions on reservoirs. In Because of this, given the strategic importance of the Castanhão reservoir for the State of Ceará, the present work sought to carry out a study on the impact of the operation of its water intake, subdividing the analysis into three main parts, namely: study of transients hydraulics; induced flow analysis involving sediment transport; and involving water quality. First, hydraulic modeling was carried out, checking the transients generated during the maneuvers. The results showed that, even for fast closing conditions (t = 60 s), pressure variations and return flow generated are small, causing no damage to the system in question or implications for the lake. In Then, computational fluid dynamics (CFD) simulations were performed in order to determine the induced runoff in the reservoir during water releases. With turbulence values ​​obtained, a model was applied as a function of turbulent kinetic energy to determine the onset of sediment transport. In this way, it was possible to verify that the flow induced by the funneling of the flow towards the water intake, generates sufficient turbulence at the bottom of the reservoir to resuspend the sediment. That resuspension is higher for higher withdrawal flows and smaller sediment diameters studied. The longitudinal extent of resuspension, however, is limited to areas close to the capture. Finally, in the last study carried out, CFD simulations were performed to determination of the percentages of flow coming from multiple layers of the reservoir, with the which weights of the water quality parameters were calculated, determining the Output water quality on a nyctemeral scale in the dry and wet seasons. Checked that the consideration of the flow generates changes in the quality parameters of the abstracted water, being able, including varying between the classes established by CONAMA Resolution No. 357/2005. THE combination of the studies carried out provides a broad understanding of the impacts generated by the operation of the water intake at the Castanhão reservoir and can promote a more reservoir, involving both quantitative and qualitative aspects.