Identificação de fragilidades ambientais na Bacia do Ribeirão São Bartolomeu, Viçosa-MG utilizando análise multicritério

• Autor(a) principal: Silva, Carlos Henrique Crespo da
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/3719
• topic: Projeto Plano de Segurança de Água-PSA; Análise multicritério; Qualidade da água; Projeto Plano de Segurança de Água-PSA; Multi-criteria analysis; Water quality; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL

This work introduces a methodical approach to obtain environmental vulnerability maps associated with the water quality for human supply, focusing on water basins. The methodology proposed uses different variables (layers of information) derived from remote sensing (acquisition of orbital imaging, correction, classification, etc.), topography (obtained from altimetry), including field data collection (water samples) and its proper spatialization. With the aim of uniting all these informational layers, generating a map of environmental vulnerability, a multicriteria analysis was used, which establishes a list of preferences among the variables pre-analyzed. One of the focuses of this work is to use different weighting methods for these variables in order to obtain a vulnerability map which is more coherent with the reality of the region studied (Ribeirão São Bartolomeu basin - Viçosa, MG), since that map will be validated with the data collected from the water quality in the basin (turbidity, nitrogen concentration and physical, chemical and pathogenic elements). This work had as main motivation the requirements of Decreto 518/204 of implementing tools for risk assentment, which however, as highlighted by Bastos et al. (2007) still not presented systematic enough in the legislation, so that it can be translated into a methodological tool for ready use by those responsible services of water supply. Through the experiments was possible to determine which regions must undergo interventions to reduce risks, which according to the best weighting method (Method of Analysis Hierarchical), this area is about 3% of the basin contribution, it's made up meanly by exposed soil and urbanized areas, besides a large concentration of animal breeding and release of raw sewage surround this area.