Avaliação da Vulnerabilidade de Barramentos ao Rompimento de pequenos barramentos localizados a montante
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2008-08-22
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Universidade Federal de Goiás
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In spite of Brazil being the country with one of the largest quantities of dams on the planet, there is no study that confront the influence of small dams collapse on major dams. This is very important from a strategic and planning point of view, since much of the energy produced in the country comes from hydroelectric installed in rivers. Althought the hydroelectric sizing is done following strict security techniques, the upstream reservoirs, in most cases are not. This factor leads to great uncertainty about safety of these dams. Thus, this work is important to the development of a methodology able to quantify how small dams affect the safety of large dams. The purpose was set a vulnerability rate to disruption of these small dams, thereby providing data for municipal, state and federal entities about the real situation for granting, construction and operation of dams. The determination of vulnerability rate was made with simulations conducted in the HEC-HMS hydrological model, thereby determining the additional flow from the disruption of dams along the upstream of the dam under study. The study site chosed was the basin of the Meia Ponte river - GO, precisely the Rochedo s hydroelectric, where 30 reservoirs were evaluated for disruption. It was found that the flow that reaches the Rochedo s reservoir, without considering the disruption of reservoirs located upstream (1.222 m³/s) for a return period of 10,000 years is about 31% higher than the flow planned for Rochedo, that is 935 m³/s, as informed by the Energy Company of Goiás (CELG, 2008). The calculated vulnerability rate was 1,31 for a return period of 10,000 years without considering the disruption of the upstream reservoirs and were suitable for a reservoir that was built in the 50's. However the flow that reaches the Rochedo s reservoir, considering the disruption of the upstream reservoirs for a return period of 10,000 years (1.880 m3/s) is much higher than flow considered without disruption of the upstream reservoirs. The calculated vulnerability rate goes to 1,54 for a return period of 10,000 years, wich is considered a high value that deserves care assessment
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MENDES, Thiago Augusto. Assessing the vulnerability of dams to the breaking of small reservoirs located upstream. 2008. 105 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2008.