SUSCEPTIBILIDADE A DESLIZAMENTOS: ESTUDO DE CASO NO BAIRRO SACO GRANDE, FLORIANÓPOLIS - SC

Abstract

The mass wasting on hillslopes is a natural phenomenon, but it can be affected by human activities. In Brazil, one of the areas affected by these problems is the city of Florianópolis - SC. To solve or reduce these problems, local susceptibility studies are an essential issue. The objective of this research work is to analyse the landslide susceptibility in Saco Grande area, a borough of Florianópolis. For that, we tried to associate several physical and social aspects envolved in the deflagration of that phenomenon. A great number of preliminary thematic maps were made, by using aerial photographies, satellite images and field data. With the support of a geographical information system, some of these maps were overlaid, resulting in the elaboration of the Landslide Susceptibility Map.With all those information avaiable, we were able to make a susceptibility analysis of the study area. We find out that the occurance of landslides are strongly related to inappropriate occupation, which is responsable for a great number of rock falls, the most common type of mass wasting in Saco Grande area. We also realized that the middle portions of hillslopes are the most dangerous places and its occupation has to be avoided. Finally, we recomend the implementation of an emergency plan in the Florianópolis city council.