Biophysical susceptibility to flooding in the Piracuruca River Hydrographic Sub-basin

• Autor(a) principal: dos Santos, Francílio de Amorim
• Data de Publicação: 2021
• Outros Autores: Silveira Mendes, Lúcia Maria, Brito da Cruz, Maria Lúcia
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Ateliê Geográfico
• Texto Completo: https://revistas.ufg.br/atelie/article/view/64590

The study aimed to evaluate the biophysical susceptibility to flooding of the Piracuruca River Hydrographic Sub-basin, based on four environmental indicators - lithological permeability, average relief gradient, circularity index and vegetation index adjusted to the soil (SAVI) – which have been integrated using map algebras. The research employed bibliographic and cartographic survey, use of Geographic Information Systems and map algebra to build the biophysical susceptibility index to floods. Through the study it was inferred that in the Piracuruca River Sub-basin the following prevails: high permeability, which occurs in 58.8% of its area; relief with a flat slope of 58.4%; micro basins with elongated shape and general circularity index ≤ 0.35, which represents a low probability of rapid flooding; vegetation with low photosynthetic activity was identified in 49% of the area. These integrated variables indicate that the average biophysical susceptibility to floods predominates, occurring in 59.5% of the Sub-basin, which indicates the need for further studies to understand the vulnerability of the located population and the creation of strategies to cope with floods. Keywords: Hydrographic Basin; Natural Disaster; Map Algebra; Biophysical Susceptibility.