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A bacia hidrografica do rio Banabuiu apresenta elevado grau de degradacao ambiental, ocasionado pelo mau uso do solo, pelo baixo desenvolvimento social e economico e principalmente pelo planejamento e gestao ineficiente de seus recursos. Em funcao disso, o presente trabalho teve como objetivo definir com o apoio de geotecnologias, a vulnerabilidade natural da bacia hidrografica do referido rio, atraves da susceptibilidade natural dos terrenos aos processos erosivos de modo a contribuir com o desenvolvimento sustentavel da bacia. Os metodos utilizados no desenvolvimento da pesquisa seguiram adaptacao das metodologias proposta por Crepani (1996; 2001), que sugerem a avaliacao dos terrenos segundo a analise integrada dos aspectos do meio fisico. Para tanto, foram elaborados mapas de geologia, geomorfologia, pedologia, vegetacao e clima. A sobreposicao dos referidos mapas em ambiente SIG gerou o mapa de vulnerabilidade natural da bacia. Constatou-se que 34,638% da area da bacia caracteriza-se como medianamente estavel/vulneravel e em 63,38% como moderadamente estavel. Tambem foi possivel observar valores elevados de fragilidade ao longo dos rios perenizados e nas margens dos principais reservatorios, que representam riscos a bacia hidrografica. A B S T R A C T The watershed of the Banabuiu River presents a high degree of environmental degradation, caused by poor land use, low social and economic development and excel of the plan and inefficient management of its resources. As a result, the present work aimed to define the support of geotechnologies, a natural fragility and vulnerability of the basin of the Banabuiu river, through the natural susceptibility of the lands to erosive processes in order to contribute to the sustainable development of the basin. The methods used in the research development will follow the adaptation of the methodologies proposed by Crepani (1996 and 2001), who propose an evaluation of the lands according to an integrated analysis of the environment. For that, maps of geology, geomorphology, pedology, vegetation and climate were elaborated. The overlapping of rights in GIS paper generated the basin's natural vulnerability map. It was observed that 34.638% of the basin area is characterized as the average or vulnerable and in 63.38% as moderately stable. It is also possible to observe the high values of the reserve of the perennial rivers and in the margins of the main reservoirs, which represent risks to the river basin. Keywords: susceptibility, water resources, planning and management.

revista brasileira de geografia física

Análise da vulnerabilidade natural da bacia hidrográfica do Rio Banabuiú, com apoio de geotecnologia (Analysis of the Natural Vulnerability of the Banabuiú River Basin, with Support of Geotechnology)