Análise morfométrica e multicriterial da bacia hidrográfica do rio santa bárbara, nordeste do quadrilátero ferrífero (mg)

Abstract

This work presents erosive potential of the Santa Bárbara river basin (MG), located in Doce river basin, through Geoprocessing and Remote Sensing applied in geomorphological analysis. For this purpose, aspects like geology, soil types, slope and land use cover were used. The erosive potencial map was made through multicriterial analysis. Some indexes of geomorphometric analysis (Stream Length-Gradient Index or Hack Index-HI and Concentration Index Roughness-CIR) were used complementarily. LANDSAT-8 image and the classifi cation images method named Maximum Likelihood were used for the land use cover map. The average performance of this method was 95,10%. The IDW interpolation was applied in order to elaborate the Hack Index Map; the kernel density estimator was applied to elaborate the Concentration Index Roughness Map. The results obtained were (i) part of the north-central portion of the river Santa Barbara Basin has the lowest values of slope, HI, CIR and potential erosion; (ii) river basin Santa Barbara presents energy high to very high in most of its area; (iii) the results were consistent if compared them at the natural and anthropic aspects of this basin. Thus, it can be considered that previous knowledge of the study area, the morphometric and multi-criteria analysis supported by geostatistical and GIS procedures, constitute eff ective tools in the work of planning and land management in interrelated way.