Uso de sistema de informação geográfica na determinação do fator topográfico da Bacia do Rio Catorze, Sudoeste do PR

Abstract

This study was designed to estimate the topographic factor of Catorze River Basin, in the municipality of Francisco Beltran - PR through of GIS. For this, we used the software Spring 5.1.8, which edited the rivers, forming the hydrographic network of Catorze River Basin. It was also edited, the contour lines, creating a rectangular grid with the values of the basin hypsometric, observing an altimetry between 540 and 962 m. Thus, one can generate an array of slope of the basin as a percentage. Edited to the dividers of water, and having hydrography basin as break line was generated ramp lengths. To perform the topographic factor used the language of the software LEGAL Spring, associating the slope of Catorze River Basin with the length of the ramp, resulting in the LS factor. Later, they produced the letters slope, slope length and topographic factor with the help of software Scarta 5.1.8. The slope in the basin has to be strongly wavy corrugated and the length of ramp is between 10 and 30 meters. The values found for the LS factor, in general, they are medians, indicating low susceptibility to erosion due to the topography of the basin. However, in the headwaters of the basin where the terrain is steeper, one can relate the high values of the LS factor for ramp lengths and the higher slopes, showing the influence of these factors in vulnerability to erosion laminar.