Modelos de previsão de enchentes em tempo real para o município de Nova Era – MG
Arquivos
Data
2009-03-20
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ISSN da Revista
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Editor
Engenharia na Agricultura
Resumo
Neste trabalho objetivou-se aumentar o tempo de antecedência na previsão de enchentes na cidade de Nova Era (Minas Gerais – Brasil), em virtude do baixo tempo de antecedência da atual metodologia de previsão do Sistema de Alerta Contra Enchentes na cidade. Assim construíram-se três modelos hidrológicos: o primeiro baseado apenas na transformação chuva-vazão, utilizando o modelo IPH II; o segundo baseado na transformação chuva-vazão (modelo IPH II) e na propagação das ondas de cheias nos canais, utilizando o modelo de Muskingum-Cunge; e o terceiro baseado na transformação chuva-vazão (modelo IPH II) e na propagação das ondas de cheias, utilizando o modelo atual do sistema de previsão. Os resultados das simulações com os dois primeiros modelos foram similares da atual metodologia do sistema de alerta, enquanto o terceiro modelo apresentou desempenho melhor do que da atual metodologia. Conclui-se, que o terceiro modelo tem potencial para auxiliar a atual metodologia do sistema de alerta no município.
Considering the short forecasting time of the present system of alert against floods in the Rio Doce basin, this study was done to increase the antecedence time for flood foresting in Nova Era County. The first hydrological model was based on rainfall-runoff transformation only, by the use of the IPH II model; the second was based on the IPH II and the propagation of the flood waves, by the use of Muskingum-Cunge hydraulic model and the third model was based on the IPH II and the propagation of the flood waves, by use of the current alert system model. The results from simulation with the first and second model were similar to that of the present alert system, while the performance of the third model was better. Thus, the data indicate the potential of the third model to improve the current alert system.
Considering the short forecasting time of the present system of alert against floods in the Rio Doce basin, this study was done to increase the antecedence time for flood foresting in Nova Era County. The first hydrological model was based on rainfall-runoff transformation only, by the use of the IPH II model; the second was based on the IPH II and the propagation of the flood waves, by the use of Muskingum-Cunge hydraulic model and the third model was based on the IPH II and the propagation of the flood waves, by use of the current alert system model. The results from simulation with the first and second model were similar to that of the present alert system, while the performance of the third model was better. Thus, the data indicate the potential of the third model to improve the current alert system.
Descrição
Palavras-chave
Modelos chuva-vazão, Modelagem hidrológica, Modelos hidráulicos