Analysis of laminar erosion in areas with agricultural and pasture usage: hydrographic basin of the Tenente Amaral river – MT

Abstract

The hydrographic system of the Tenente Amaral river has its area inserted in the morphosculptural units of the Interplateau Depression of Rondonópolis and the Plateau and Chapada dos Guimarães. The work presents the results of the monitoring of displacement of material by surperficial erosion in two experiments located in pasture and agriculture areas during the period from September 2013 to August 2014 in the morphosculpture of the Plateau. In the period, the area with agriculture presented a cumulative of 7,026 mm of precipitation, and an eroded material rate of 347.8 g/l, totalizng 24.18 kg/m²/year. Meanwhile, pasture had volumes of 6,667 mm, eroded material rate of 215.8 g/l, and total eroded material of 25.91 kg/m²/year. In both areas the type of material displaced is represented first by the sand, followed by the clay and, in smaller volume, by the silt.

Keywords

• Erosão laminar
• Rio Tenente Amaral
• Calhas de Gerlach