GEOMORPHOMETRIC COMPARTMENTATION OF HYDROGRAPHIC BASIN OF THE ARROIO CAVERA – RS/BRASIL

Abstract

DOI: http://dx.doi.org/10.12957/geouerj.2014.10030

The study of landforms, in recent years, it has acquired new dimensions, descriptive analyzes give rise to integrated studies that consider the complexity of earth's surface. With the advent of Geographic Information Systems - GIS and development of methods of geoprocessing is possible to represent the surface earth in the form of numerical models or Digital Terrain Models (DTM), which allow the topographic analysis of an area of interest, as well as the automated calculation a series of related variables. The parameterization of the reliefrefers to the quantitative representation of morphological features of the landscape continuously described by equations applied to numerical modelsaltimetric representation, the MDTs, which derive attributes. This study wascarried out in the watershed of ArroioCaverá located in the western region of Rio Grande do Sul, through the geoprocessing techniques associated with digital analysis relief which determined the parametric representation of the relief forms, with use of topographic parameters obtained from an DTM, is elaborating onegeomorphometric partitioning. To do this classification we used a proposal for automated mapping geomorfométrico presented by Silveira&Silveira (2013), from the precepts Iwahashi and Pike (2007) that is performed by crossing topographical information and attributes generated by the GIS and hierarchized through a decision tree based on values pre-defined, withbased on knowledge of the area. Four topographic attributes were employed:altimetry, slope, profile of curvature and plan of curvature that resulted indefinition of twelve units of relief.