Avaliação da fragilidade potencial e emergente do município de Iguape – SP

Abstract

The mapping of environmental fragility presents itself as an important tool in understanding areas of the high, medium and low environmental risk, allowing correlating physical-natural stabilities and instabilities, in face of anthropic interventions. Considering the importance of these mappings, the present work aims at the geoenvironmental characterization and the evaluation of the potential and emerging fragility of the city of Iguape – SP, combining climatic, pedological, geomorphological and current land use information. To obtain the geoenvironmental data, we used the GIS DataGEO, SIG-RB and geoSGB, which provide geo-referenced geographic information. The software QGIS was used for the treatment and processing of thematic and fragility charts. Using the annual precipitation, soil and slope maps, indexes based on Ross (1994) methodology were used to classify the potential fragility. The land use map was also used to classify emerging fragility. The fragility mapping associated with the geoenvironmental data allowed to identify the best areas for anthropic occupation and urban expansion, maintenance of native cover and preservation areas. It was also possible to recommend methods of remediation of erosive processes, mass movements and prevention of flooding in the city.