Erosão laminar e transporte de sedimentos na bacia do Rio Marrecas, no Sudoeste do Paraná

Abstract

Erosion and its related impacts have been taking place for a long time and have significantly influenced the environment and living beings. Furthermore, erosion, in addition to causing impacts on the soil, is related to the transport of sediments, which can cause siltation and contamination of water bodies, in addition to harming the quality of the soil and water. The city of Francisco Beltrão has tools and equipment that provide a good structure for hydrosedimentological monitoring that can be explored in order to provide support for urban planning in relation to impacts related to flooding, as well as erosion and sediment transport in the Marrecas river basin. In this context, the present study aimed to determine the key curve for sediments from data obtained in the field and fluviometric monitoring tools, as well as to estimate the laminar erosion in the basin through geoprocessing tools and samples collected in the field. This work was carried out considering the following steps: determination of soil losses, measurement of suspended solids and elaboration of the sediment key curve. The soil losses found in the study area for the different monitored dates were classified into the normal, mild, moderate, strong, very strong and catastrophic classes, where the class with the highest occurrence was the normal class (<0.5ton.ha- 1.year-1) and the class with the lowest occurrence was the catastrophic class (>200 ton.ha-1.year-1). There was a high significance in the relation of quota and net discharge determined for the control point used to obtain data for the elaboration of the sediment key curve. However, there was low significance in the relation between sediment discharge and net discharge. Finally, the present work intends to contribute to the dynamics involving erosion and sediment transport in the Marrecas river basin.