Zoneamento de áreas inundáveis no Baixo Cauamé, Boa Vista, Roraima

• Ano de defesa: 2022
• Autor(a) principal: Barroso, Carlos Francisco Salgado
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Roraima; Brasil; PRPPG - Pró-reitoria de Pesquisa e Pós-Graduação; PROFÁGUA - Programa de Mestrado Nacional Profissional em Gestão e Regulação em Recursos Hídricos; UFRR
• Palavras-chave em Português: Mapeamento de risco; Bacia hidrográfica; Modelo de ocupação; Gestão; Risk mapping; Hydrographic basin; Occupation model; Management; CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS
• Link de acesso: http://repositorio.ufrr.br:8080/jspui/handle/prefix/765

The Boa Vista city is located on two hydrographic basins with relevant hydrological characteristics, the Cauamé and Branco rivers basins, in such a way that for more than five decades it has suffered from flood events. In this period, little progress has been made in the treatment related to prevention, and areas and people affected. As a way of mitigation are implemented urgent and emergency actions, little planned and less efficient actions. Allied to this context, the City presents itself with a disorderly expansion process that favors the occupation of environmentally unsuitable areas for housing. The lack of tools that classify and define risk areas makes it difficult to order and manage areas subject to flooding events in the City. From this perspective, this work aimed to identify and classify the flood risk zones resulting from flooding recurrence events in the lower Cauamé River basin, seeking to establish an occupation model. For this, the maximum occurrences of flood events were mapped of the historical series of the Cauamé and Branco rivers, based on data from the Agência Nacional de Águas. The data were processed and associated with the reference image of the continuous cartographic dataset of the Roraima state, which applying a digital elevation model and opens cartographic data resulted in the composition of the risk map product. The product presents the simulation of the flood events that occurred and that we extrapolated here. Furthermore, the areas affected by the flooding events were classified in zones Z-1, Z-2, and Z-3, according to the degree of risk, and the use and occupation model was created for each scenario of quota, presenting their respective indications of proposal for use. The results indicate that maximum flood events tend to occur in a time frame lesser than 51 years. According to the risk map, there is evidence of floodable areas in all regions of the City on the limit of the Z-3 zone during the simulated events for quota with an elevation equal to or greater than 67 meters, reaching from consolidated neighborhoods to neighborhoods in the process of expansion. In addition, the map evidences the critical aggravation of the Z-1 of high risk and Z-2 of medium risk, of the quota of elevation, respectively of 60 and 63 meters, with tends for the occurrence of floods in the time frame lesser than two years. The scenarios presented reveal the urgent need to implement structural and non-structural actions in the area of the lower Cauamé River and subsidiarily to the Banco River, since, even if predicted, flood events may behave differently during their occurrences.