Modificações no padrão de drenagem da microbacia do passarinho - Manaus (AM): a formação de barras sedimentares tecnógenas por deposição de resíduos sólidos

Abstract

This paper contextualizes the environmental reality of the creeks of Manaus along its historic building, in particular taking into consideration the changes in the drainage system of the watershed Finch located in the north of Manaus, the main area of growth in recent decades. In this sense, this work aimed to analyze the process of formation of sedimentary tecnógena river bars in that unit as well as to characterize the physical properties based on the gravimetric composition of solid waste and soil analysis through testing and determination of granulometric class’s texture. In this sense réalisés tests with soil samples showed the presence of natural sediments: sand, silt and clay and solid waste. The proportion between the two elements corresponds to 96% of natural sediments and 4% of the anthropogenic waste. Regarding the classes of waste was observed by means of gravimetric composition that tecnógena sedimentary bars are constructed of materials: plastic, metal, cloth, rubber, and other organic matter. The ratio of these residues represented in terms of the amount corresponding to 9,016kg value, and the plastic item to be greater, representing 54% of the residues analyzed. Other items that also stood out during weighing were the metal packaging which registered net weight of 1.27 kg, 1.16 kg and fabric rubber with 0,845kg. These results are key to highlight the impacts produced by sedimentary bars in the watershed of the Finch, mainly in relation to the volume of sediment, as these represent direct impact on the flow capacity of rainwater and contributes to the increased risk of flooding and proliferation diseases.