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A acao neotectonica afeta o perfil de equilibrio dos rios, alterando a energia dos canais e influenciando diretamente no seu potencial de dissecacao. Nesta pesquisa objetivou-se avaliar o controle estrutural, condicionado pelo regime climatico umido, na dissecacao do relevo da Bacia Hidrografica do Rio Gloria, Minas Gerais. A area de pesquisa localiza-se em uma regiao de importantes dobramentos, falhamentos e escarpas para a paisagem tectonica do Brasil Oriental, com litologia caracterizada por complexos metamorficos e suites intrusivas. A analise foi realizada com a aplicacao de parâmetros morfometricos, tendo como suporte os Sistemas de Informacao Geografica. A relacao de bifurcacao, o Indice de Concentracao da Rugosidade e o Indice Stream Lenght-Gradient permitiram identificar o controle estrutural sobre os cursos fluviais e alta rugosidade do relevo, atribuido a reativacao estrutural de falhas Meso-Cenozoicas sobre as litoestruturas do Pre-Cambriano. Esses parâmetros tambem indicaram diferencas com areas de historia tectonica similar em clima mais seco, evidenciando o condicionante climatico sobre a rede de drenagem e a estrutura. A aplicacao dos parâmetros morfometricos a partir de tecnicas e procedimentos em ambiente SIG mostrou-se eficiente para detectar as influencias estruturais e climaticas na conformacao do relevo, com potencial para aplicacao no planejamento territorial de bacias hidrograficas. A B S T R A C T Tectonic phenomena affect the balance of river profile, changing the energy of channels and influencing the potential for dissection. This research aimed to evaluate structural control, conditioned by humid climate regime, on dissection of the watershed rio Gloria relief, Minas Gerais . The area is located in a folding and faulting neotectonics landscape of eastern Brazil, with lithology characterized by complex metamorphic and intrusive suites. Morphometric parameters data were used, supported by the Geographic Information Systems. Bifurcation ratio, Concentration Index Roughness and Stream Lenght Index Gradient have identified control of the reactivation of Meso-Cenozoic faults on Precambrian rocks, with the presence of major tectonic anomalies in river courses and high roughness relief. These parameters also indicated differences with areas of similar tectonic history in drier climate, evidencing the climatic condition of the drainage network and structure. The application of morphometric parameters from techniques and procedures in a GIS environment proved to be efficient to detect structural and climatic influences in relief conformation, with potential for application in the territorial planning watershed. Keywords: Bifurcation Ratio; Concentration Index Roughness; Stream Lenght Index Gradient.

revista brasileira de geografia física

Controle Estrutural e Neotectônica na Dissecação do Relevo em Mares de Morros no Sudeste Brasileiro (Structural Control and Neotectonic in the River Dissection of the Relief of “Seas of Hills”, in Southeastern Brazil)