Estimativa do assoreamento do reservatório do Bom Jardim a partir de modelos de eficiência de retenção de sedimentos.

Abstract

The Bom Jardim river, located near from the city of Uberlândia, has its area of influence in the Triângulo Mineiro region due to the numerous activities that are necessary, under the supervision from an artificial reservoir to the water of Uberlândia, most populous city in this meso-region. The preventive studies carried out to maintain the operational binomial of the river and its basin are important, since a problem that occours in reservoirs in general is the silting, which can help to reduce the useful volume. With the objective to study the phenomenon, this work sought empiric models of reservoir silting and statistical techniques for regionalization of tributaries, in order to raise quantitative parameters on both the flow and sediments deposited. To make this studies, were used computational tools like Google Earth, Microsoft Excel and historical data from precipitation and flow, available on the Hidroweb system, in the website from National Water Agency (ANA). With the necessary data in hand, in a first step, were possible to regionaliza the medium monthly flows that feed the reservoir of Bom Jardim. In the second stage of the work, the retention efficiencies in the reservoir and the volume from the deposited sediment in its temporal evolution were calculated. The results showed that the amount of mass deposited has many influence to depreciacion on the