DINÂMICA EROSIVA EM MARGENS PLENAS DE CANAL FLUVIAL

Abstract

The banks erosion in river is in the most dynamic processes of the landscape and can be influenced by several factors. The bank erosion is a result of the interaction between the ravines conditions and the fluvial characteristics. Therefore, erosion rates are determined by the ravines resistance against the potential erosive flow. The adjacent land use is also a determining factor in erosion processes, once the protection exerted by riparian vegetation ceases to exist when it is replaced for other ends. This study aimed to analyze the dynamics of banks erosion along the Guabiroba River located in Guarapuava - PR. However, it was considered the physical parameters of the evaluated sections: material texture, ravines face resistance, slope, and the fluvial stream characteristics. The estimated margins erosion was performed by monitoring erosion pins (volumetric technique). Thus, it was possible to quantify rates of river banks erosion at Guabiroba River, as well as identify and classify the occurring erosion processes. The material loss value along the river banks at Guabiroba River was approximately 1684.7 tons, registered between October 2010 and January 2012, mainly represented by the interaction of corrosion processes and undermining.