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The hydrosedimentological cycle is of fundamental importance for the understanding of river dynamics and modelling of the physical environment. In relation to the Acre River, its geomorphologic dynamics is linked to the river banks sliding, which obeys the variations of the fluvial regime with the floods and vazantes. Morphological studies are an important indication of hydrodynamic behavior, as well as the external factors that influence: matrix rock, depositional environment, agents involved and durability of particles. The purpose of this article is to analyze the particle size variation of the acre river bed in the municipalities of Assis Brazil, Brasileia and Rio Branco, as well as, through the application of image processing techniques associated with the calculation and interpretation of morphometric indices, to quantify the dimensional variability of the sand fraction present in the river bed of the Acre River, in the samples of the city of Rio Branco. Finally, the work concludes: i) the average grain size of the bottom sediments of the Acre river is reduced in diameter along the route from the city of Assis Brazil to Rio Branco; ii) the sediment morphometry technique showed evidence of the process of wear and remobilization of the particles from the exit of the matrix rock to their deposition; iii) the use of ImageJ software proved efficient in speed and precision for analysis and morphometric differentiation of the sandy sediments in the analyzed stretch.

uáquiri

VARIAÇÃO GRANULOMÉTRICA E MORFOLÓGICA DOS SEDIMENTOS DE FUNDO DO RIO ACRE: CONTRIBUIÇÕES INICIAL AO ESTUDO HIDROSSEDIMENTOLÓGICO DE CANAL FLUVIAL NO SUDOESTE AMAZÔNICO