MORPHOSTRUCTURAL ANALYSIS OF THE RIBEIRAO AGUA DAS ANTAS DRAINAGE BASIN--PR/ANALISE MORFOESTRUTURAL DA BACIA DO RIBEIRAO AGUA DAS ANTAS--PR

Agua das Antas River Basin is located in central north state of Parana, having its greater domain on Grandes Rios city, at the transition from the Second to Third Paranaense Plateau. It's modeled on Rio do Rasto, Piramboia, Botucatu e Serra Geral Formations of Parana Sedimentary Basin. In the present paper are identified and interpreted drainage anomalies in that catchment, from aplication of morphometric indexes, remote sensing tecnics and geoprocessing for making maps of annomalies from the study area. The drainage anomalies and asymmetries correspond to abnormalities or irregularities from morphoestructural e morphotectonical processes mainly. The morphometrical indexes used, as the factor of asymmetry of the basin, transverse topographic symmetry factor and slope length relationship showed satisfactory data, identifying high degree of asymmetry in the basin. Through photointerpretation were identified anomalous curvatures, straight segments, active erosion, abandonment of drainage area, drainage and sub-radial and radial migration trend channel which are considered anomalies. Due to the strong asymmetry of the channel, Agua das Antas River catchment was analyzed in the light of morphostructural zones, generated by the difference of fault blocks being possible check the action of the recent tectonics affecting the drainage network.