60143

Análise Multitemporal da Cobertura de Dunas ao longo do município de São José do Norte/RS

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The present work was to determine the variation of the dune cover along the area of the municipality of são josé do norte, rs between the years of 2005 and 2011. For that, TM-Landsat 5 orbital images of the years 2005, 2006, 2009 and 2011. With these images, the normalized difference snow index (NDSI), classified by thresholds, was calculated, which resulted in a dune image for each date. These images were used together with the technique of detection of changes to analyze variations in the coverage of dunes along the area. The loss on the dune area is a consequence of human occupation and, mainly, changes in vegetation cover, caused by the insertion of exotic species (pinus and eucalyptus). The subtraction in the area of the dune field observed totaled an amount of about 13000 hectares. These data, however, are not yet sufficient to clarify hypotheses about the dynamics of the area. The losses in the dune fields totaled average rates of around 2000 hectares / year, following the pattern of the north-easterly (NE) loam winds