Análise da distribuição granulométrica ao longo da bacia hidrográfica do Rio Meia Ponte - Goiás

Abstract

The rivers are one of the main means of transportation of sediments, being these coming from erosive processes that occur in the surface, caused by the action of external dynamic agents like wind, gravity, ice and as also by anthropic activities. The Meia Ponte-Go River Basin has the main tributaries that supply the city of Goiânia and metropolitan region, being of great importance the knowledge of the hydro - sedimentological characteristics, mainly when it refers to the granulometry of suspended sediments, being this a variable that is not given the due importance in the management and planning processes. The objective of this study was to characterize the granulometry of suspended sediments in tributaries along the basin, as well as to compare two particle size calibration equipment using laser diffraction technology: LISST-SL and MASTERSIZER 2000. The samples were collected with the Van Dorn Bottle sampler, from the point method by integration. According to the results, it was observed that the granulometry of the suspended sediments decreased downstream from the main river (Meia Ponte), with a decrease in the mean diameter (D50) from the dry season to the rainy season. In relation to the comparison of the granulometers, a difference was obtained 17% for section 2, and 20% for section 3, in relation from one equipment to another.