Avaliação da vulnerabilidade ambiental em áreas verdes urbanas no município de Teresina - Piauí

Abstract

The central idea of the proposed work was to identify and analyze green areas within the urban perimeter of the city of Teresina, based on their environmental vulnerability. To this end, an adaptation of the methodology of Crepani et al. (2001) on environmental vulnerability was used, employing indicators of geology, geomorphology, pedology, land use and land cover, and climate to create an environmental vulnerability index, as well as using NDVI to obtain the green areas belonging to the urban region of Teresina. A temporal vulnerability analysis was also performed using the change in the land use and land cover indicator over a period of 30 years. When generating the environmental vulnerability index, it was noticed that the city of Teresina, for the most part, falls within the Moderately Stable/Vulnerable vulnerability class. However, when compared to the 30 year gradient, a significant increase in environmental vulnerability is noticeable. The urban green areas of Teresina follow the same trend as the city's overall environmental vulnerability, but the areas with the highest vulnerability are those that are geomorphologically located within the floodplains and geologically in areas with alluvial deposits, demonstrating the interconnection between river dynamics and urban green areas. Thus, after careful analysis of the information, it was understood that in order to maintain the urban green areas of the city of Teresina, it is necessary to implement an action plan focused on the most vulnerable areas, using rivers as guidelines for the management of these areas due to their integration correlations. Understanding the gradient of changes in environmental vulnerability is of paramount importance for understanding the transformations that are taking place in cities, so that the effects of climate change, which have such a significant impact on the lives of urban populations, can be addressed more efficiently.