AVALIAÇÃO DOS IMPACTOS AMBIENTAIS NOS SEDIMENTOS DA BARRAGEM DO RIO MEIA PONTE DO MUNICÍPIO DE INHUMAS - GO

Abstract

A study of the physical and chemical characteristics of surface sediments (0-15 cm profile) reservoir in two seasons was performed to evaluate its impact on the environment. Four sampling points were selected upstream the reservoir, being three in the reservoir and one in the river. Ambiental Parameters (phosphorus, pH, organic matter, humidity and granulometry) were evaluated and analyzed by Principal Component Analysis (PCA). In the PCA with the season data was retained 77,5% variability of data. There wasn’t seasonal classification. Phosphorus showed influence of constituents of the matrix and a narrow dependence with finer particle size, organic matter and humidity, corroborating important biogeochemical mechanisms. Moreover, for sediments in the reservoir sampled prevails a sandy particle size arising from external sources. The construction of the reservoir and human activities has caused significant impacts to the environment and changes in biogeochemistry of sediment, resulting in a decrease in sorption nutrients / contaminants. Index Terms - Environmental impact, physical-chemical analyzes, sediment, reservoir.