Modelagem dos níveis de base fluviais da bacia do rio Jacuípe, nordeste semiárido do Brasil

Abstract

This article aimed to spatially model the base levels of the Jacuípe River and its tributaries. For this, remote sensing products and geoprocessing techniques were implemented in a Geographic Information System environment, in order to automatically recognize the distribution of fluvial anomalies; determine their structural, tectonic, lithological, hydrological and anthropic controls, through thematic maps of structural indices (Lineament Map, Lineament Density, Lineament Frequency) and geomorphological (Drainage Density and Flow Frequency), which were integrated with Fuzzy Logic and Hierarchical Process Analysis (AHP), as well as morphotectonic maps (Drainage Basin Asymmetry Factor and Transversal Topographic Asymmetry Factor) and geological maps combined with orbital images from Google Earth Pro; and to establish the possible relationships between base level variations and neotectonics through seismic data. The main results obtained were the identification of 1,634 2nd order and 101 1st order drainage anomalies, with 90% of the latter features being concentrated in the upper course. There was notable structural and tectonic control in the formation of anomalies and no indicators of recent tectonic action where observed, related to the reactivation of faults and the formation of knickpoints.