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O municipio de Belem (PA) localiza-se numa regiao onde se acumulam as influencias do regime fluvial e de mares, delimitada por uma extensa area de varzea urbanizada. Neste trabalho caracterizou-se a dinâmica das areas de varzea do municipio de Belem (PA) em funcao da relacao entre a variacao da precipitacao pluviometrica e a ocorrencia de pontos de alagamentos. O metodo adotado constou da espacializacao das ocorrencias de alagamento em relacao aos limites topograficos das areas de varzea e caracterizacao do comportamento da precipitacao pluviometrica, considerando sua variacao de intensidade ao dia. Os resultados obtidos indicam que os pontos de alagamentos em Belem tem relacao com as baixas topografias drenadas por 11 bacias hidrograficas de diferentes caracteristicas fisicas, porem existem ocorrencias associadas a infraestrutura urbana inadequada, que dificulta o escoamento e a infiltracao. A precipitacao pluviometrica atua de forma conjugada ao efeito das mares para o aumento das condicoes de risco, porem a variabilidade das condicoes que influenciam a formacao das areas alagadas nao permite inferir um volume minimo capaz este processo. Palavras–chave : bacias hidrograficas; escoamento; areas alagadas. Abstract The city of Belem (PA) is in a region with influence of the fluvial system and tides, limited by an urban floodplain. This work characterized the dynamics of floodplain areas in the city of Belem (PA) and their relationship with the rainfall intensity and the occurrence of flooding points. The method consisted of the spatial distribution of flooding points, in the relation with the topographical limits of floodplain areas and the characterization of rainfall, considering the intensity variation by day. The results indicate that the occurrence of flooding points in Belem is related to the low topographies drained by 11 watersheds with different physical characteristics, however also related with inadequate urban infrastructure, which hinders the runoff and infiltration. The rainfall and the effect of the tides act together to increase the risk conditions, but the variability of conditions that influence in the formation of flooding points does not permit infer a minimum volume for begin this process. Keywords : watershed; drainage; wetlands.

caderno de geografia

Dinâmica das áreas de várzea do município de Belém/PA e a influência da precipitação pluviométrica na formação de pontos alagamentos / Dynamics of lowland areas in the city of Belém/PA and the influence of rainfall in the flooding points formation