Comparação de metodologias para análise da fragilidade ambiental em bacias hidrográficas: estudo de caso dos rios São Francisco verdadeiro e São Francisco falso, região Oeste do Paraná

• Ano de defesa: 2020
• Autor(a) principal: Ribeiro, Ana Carolina Peterle
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Tecnológica Federal do Paraná; Medianeira; Brasil; Programa de Pós-Graduação em Tecnologias Ambientais; UTFPR
• Palavras-chave em Português: Bacias hidrográficas; Solos - Erosão; Mapeamento ambiental; Watersheds; Soil erosion; Environmental mapping; CNPQ::ENGENHARIAS::ENGENHARIA SANITARIA; Engenharia/Tecnologia/Gestão
• Link de acesso: http://repositorio.utfpr.edu.br/jspui/handle/1/28851

The analysis of environmental fragility is extremely important for the study of a hydrographic basin, as it approach relevant characteristics of it, making its characterization more complete, in order to prevent and minimize problems related to environmental quality. The present study aimed to determine the environmental fragility of the São Francisco Verdadeiro and São Francisco Falso River basins through different methodological approaches, Ross (1994), Embrapa (1997) and FAO (2006), as well as comparing them. At first the characterization of the hydrographic basins was realized. maps of fragility of the soil types, declivity and land use and occupation were elaborated for this, usin for this type of analysis maps already prepared in previous works. The methodologies differ only for the design of declivity fragility maps, assigning different declivity ranges to the fragility classes. Through the interaction of the declivity fragility maps and soil types it was possible to build the potential fragility maps for each approached methodology. Potential fragility map and land use and occupation fragility map were used to design the emerging fragility map of the basins. Based on these maps, it can be noted that the basins presented a greater portion of area for the fragility classes classified as low and very low throughout its extension. The comparison between the methodologies of Ross (1994), Embrapa (1997) and FAO (2006), allowed to verify that all presented similar results for the environmental fragility, but the best proposal presented for the study area is the Ross methodology (1994), as it assigns smaller spacing for the declivity ranges above 12% of inclination and greater importance for the steepest reliefs (greater than 30%), where there is a greater propensity for the occurrence of erosion and soil loss, being declivity one most relevant factors for determining the environmental fragility.