Caracterização hidrossedimentológica e estudo da qualidade dos sedimentos na bacia hidrográfica e lago da UHE Barra dos Coqueiros
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2018-05-17
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Universidade Federal de Goiás
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By building dams in a watercourse, the hydrosedimentometric dynamics of the water bodies
changes. Due the reduction of transport energy, the particulate material transported starts being
deposited, reducing the volume and the useful life of the reservoir. In order to take mitigating and
preventive measures, it is necessary to diagnose the sectors with the greatest amount, volume and
distribution of sediments in the area of influence. The general objective of this work was to
evaluate the sedimentation stage, to detect the current depositional models and to evaluate the
quality of the sediments, aiming at possible mitigation measures in relation to the sedimentation
of the reservoir of the Barra dos Coqueiros hydropower plant, located on river Claro, between the
municipalities of Caçu and Cachoeira Alta. In order to reach the proposed general objective, the
physical characterization of the area of influence on the reservoir was carried out, from
geological, geomorphological, slope, soil, climate, land use and vegetation cover aspects. And to
determine the possible source areas related to erosive processes, the map of potential fragility and
emergent fragility was generated. In order to understand the main sites of impact,
hydrosedimentological studies were carried out through CSS, Turbidity and Water Transparency
variables. The study of current depositional models was carried out from the study of facies. The
quality of the sediments was evaluated by the heavy metals Cadmium, Nickel, Copper, Lead and
Mercury. According to fragility analysis, 30% of the area is classified as medium and high
fragility, demonstrating the need for planning and utilization of conservation practices in relation
to the use and vegetation cover. By means of hydrosedimentological studies, it was noticed the
reduction of CSS and Turbidity downstream, according to the velocity of water flow and depth
analyzed in the bathymetric surveys, in which a reduction of 0.51% of the dead volume of the
reservoir was observed. Depositional models that predominate are associated with silt/clayey
facies for riverbed deposits, sandy facies for stream deposits and silt/clayey and sandy facies for
delta deposits. Regarding sediment quality, it was verified that cadmium presented concentrations
higher than the reference parameter determined for sediments by CONAMA Resolution
454/2012. In the soil, it was also verified that heavy metals were superior to the reference values of the resolution CONAMA 420/2009, that’s related to the natural formation of the soils and to
the use and occupation of the earth.
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OLIVEIRA, Susy Ferreira. Caracterização hidrossedimentológica e estudo da qualidade dos sedimentos na bacia hidrográfica e lago da UHE Barra dos Coqueiros. 2018. 149 f. Tese (Doutorado em Geografia) - Universidade Federal de Goiás, Goiânia, 2018.