Estradas rurais sem pavimentação como elemento de conectividade na transferência de sedimento e água em cabeceiras de drenagens em Guarapuava - PR

Abstract

The unpaved roads, when they do not present efficient drainage systems, become connectivity elements in the transmission of sediment and water to river channels, occurring variations in the suspended-sediment concentration and flow increase in the channels during rainfall event. This study evaluated the contribution of different roads, main road and secondary road, in the Suspended-Sediment Concentration and Flow, in first- and second- order streams, upstream and downstream of the road/river crossing, evaluating the role of the consecutive rainfalls and periods of drought and relating them to the roads physical characteristics, to understand the hydrosedimentological dynamics that occurs in these same roads. The results showed that the characteristics of the bed and the use of the road are related to greater or lesser production/availability of sediment, which will be transported during rainfall, and that in drought period the road produces / provides greater amounts of sediment than in periods which successive rainfalls take place. Rural roads presented at the headwater drainage basin of Guabiroba River, Guarapuava - PR, have contributed to up 40% of increase in flow in the river channel during the monitored period.