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

Abstract

The hydro sedimentological cycle is of fundamental importance for the understanding of river dynamics and modeling of the physical environment. In relation to the Acre River, its geomorphological dynamics is linked to the landslide of the river, which obeys the variations of the fluvial regime with the floods and ebbs. Nevertheless, morphological studies are an important indicator of hydrodynamic behavior, as well as the external factors that influence: matrix rock, depositional environment, agents involved and particle durability. This work aims to elucidate an analysis of the granulometric variation of the bed of the river acre in the cities of Assis Brasil, Brasiléia and Rio Branco, as well as, through the application of image processing techniques associated with the calculation and interpretation of morphometric indices, quantify the dimensional variability of the sand fraction present in specific points collected in the riverbed of the river Acre in the municipality of Rio Branco. Finally, the work concludes that: i) the average grain size of the bottom sediments of the Acre River, will decrease in diameter along the route from Assis Brasil 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 until its deposition; iii) the use of the ImageJ software proved to be efficient in speed and precision for analysis and morphometric differentiation of the analyzed section.