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Erschienen in: Environmental Earth Sciences 5/2010

01.01.2010 | Original Article

GIS-based environmental risk assessment in the Ribeira Valley, São Paulo, Brazil

Erschienen in: Environmental Earth Sciences | Ausgabe 5/2010

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Abstract

The Ribeira Valley region (State of Sao Paulo, Brazil) hosts the largest Brazilian Atlantic forest reserve. The region was an important mineral district during the ‘60s, from where several tons of lead and other metals were exploited. Residual materials produced by the mining are diffused in the environment until today. The area also encompasses a regional arsenium anomaly associated with unexplored gold deposits. The population presently living in this region performs basic farming activities, from which most of their food is yielded. These features coupled together imply in a complex relationship between natural and anthropogenic factors that are likely to affect the life and health of the local communities. The aim of this paper is to apply digital data integration techniques for environmental risk assessment in the Ribeira Valley using environmental geochemistry. Geochemical, digital elevation and remote sensing data (Landsat Thematic Mapper) were merged and analyzed using a geographical information system. The assumed model considered environmental mobilization through erosion and anomalous As–Pb areas. Data were analyzed through Boolean and fuzzy logic techniques. Fuzzy logic proved superior in this case study as it allowed not only the detection but also the distinction between low, moderate and high environmental risk areas.

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Metadaten
Titel
GIS-based environmental risk assessment in the Ribeira Valley, São Paulo, Brazil
Publikationsdatum
01.01.2010
Erschienen in
Environmental Earth Sciences / Ausgabe 5/2010
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI
https://doi.org/10.1007/s12665-009-0104-7

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