Abstract
Abstract. By means of the multitemporal approach, we analyze the changes in land use and vegetation cover in the São Francisco do Sul and Itapoá municipalities, located in the northern coast of the State of Santa Catarina, Brazil. LANDSAT satellite images from 1991 to 2019 were analyzed and classified into four classes of soil use and occupation (vegetated area, bare soil, urbanized area, and water body) by the GEOBIA method. Weighted sum analysis was applied to the ‘urbanized area’ class and the data available on geologic units, so as to identify areas vulnerable to groundwater contamination. The vegetated areas of São Francisco do Sul and Itapoá have diminished along the 2000’s, but recovery measures, such as reforesting and restraint of soil exposure, have been adopted, with 89.61% success. The urban zone has increased 3.36% in the last 28 years. The achieved overall accuracy for the classification was of 79.33% and the Kappa coefficient was 0.69. The analysis of groundwater vulnerability to contamination helped identify regions more susceptible to pollution, which coincide almost entirely with those where urbanization was more intense in areas where unconsolidated sediments predominate.
Highlights
Human occupation has been historically more intense and concentrated in regions near the coast than inland
The main goal of this study is to analyse the evolution of land use and vegetation cover in the São Francisco do Sul and Itapoá municipalities, located in the northern coast of the State of Santa Catarina – Brazil, using a multi-temporal approach
As the first objective of this research was to analyse the evolution of soil use and occupation in the São Francisco do Sul and Itapoá municipalities, focusing on variations in vegetation cover and on urban occupation, a major separation between ‘vegetated area’ and ‘non-vegetated area’ was prioritized
Summary
Human occupation has been historically more intense and concentrated in regions near the coast than inland. The main goal of this study is to analyse the evolution of land use and vegetation cover in the São Francisco do Sul and Itapoá municipalities, located in the northern coast of the State of Santa Catarina – Brazil (figure 1), using a multi-temporal approach (satellite images from 1991 to 2019). The ports evolved as the region evolved and this evolution is strongly related to the regional economy, which led to an increase in population and exploitation of natural resources, so as to support economic goals and subsistence needs. Another goal of this research is to identify areas with higher groundwater vulnerability to contamination, taking into account the geological aspects of these areas. The susceptibility of the geological material to infiltration was taken into account, as well as the classes/sectors that contribute most to contamination
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