Produção e deposição de sedimentos em uma sub-bacia hidrográfica com solos suscetíveis à erosão

Abstract

Soil degradation brings erosion as consequence, causing siltation and contamination of water courses. This study aimed to estimate soil loss and sediment deposition in the sub-basin of Dois Córregos river, located in Selvíria municipality, MS, Brazil, in order to identify areas with higher susceptibility to these processes, using the LISEM modelas tool. The sub-basin river soils are Red Oxisol and Red-Yellow Alfisol, both with sandy texture. For the simulations the LISEM model was used, with data collected from rainfall intensity between the years 2009-2012 Ten events were selected with higher rainfall intensities for the study period. To obtain the required input parameters, soil samples were collected. The collections were made at ten sites of the river sub-basin, in the different forms of soil use and occupation. The eucalyptus provides protection to the river sub-basinsoils. The produced sediments are deposited in the beds of the river sub-basin, causing the silting of waterways. The LISEM model is efficient for locating the areas susceptible to erosion processes in the river sub-basin studied, however, in the quantification of soil loss, it does not simulate the runoff subsurface, which may have caused underestimation of these processes.