Bottom Sediment Dynamics In The River-Floodplain System Of The Sepotuba/Paraguay Rivers, Mato Grosso, Brazil

In fluvial systems the dynamics of the bottom sediments contribute to important morphological changes, being well expressed by the evolution of the flood plain in interaction with their rivers. This research had as a general objective to analyze the dynamics of the river-floodplain system, through the circulation patterns of bottom sediments, associated with fluvial processes of transport and deposition in the Sepotuba-Paraguay rivers, Upper Basin, Mato Grosso. For this, a bibliographical survey was carried out, field work for sampling the bottom sediments associated with the measurement of hydrodynamic variables and laboratory analyzes to determine the granulometry of materials transported by the Sepotuba river and, from this and from Paraguay, in the confluence environment. With this, it was verified that the bottom sediments in the lower course of the Sepotuba River have a granulometric composition, predominantly sandy, mainly fine sand and very fine sand, as well as the materials transported in the Paraguay river. The bottom sediments in the lower course of the Sepotuba river have a granulometric composition, predominantly sandy, mainly fine sand and very fine sand, as well as the materials transported in the Paraguay river. The secondary channel (Sepotuba river) has lower volume (m(3)/s-1) and flow velocity (m/s-1) compared to the main channel. Such factors contribute to the abandonment of the secondary channel, associated with the deposition of sediments with the formation of sandbars and bed forms. In this context, it is essential to monitor and map space-time environmental changes related to sedimentological in the lower course of the Sepotuba River, an important tributary of the Paraguay river. Where the river environments, which make up the system, are constantly evolving.