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Volume 34, N 1 - maio 2013

 

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Revista Recursos Hdricos
Volume 34, Nmero 1, novembro 2013

DOI: 10.5894/rh34n1-5
O texto deste artigo foi submetido para reviso e possvel publicao em janeiro de 2013, tendo sido aceite pela Comisso de Editores Cientficos Associados em abril de 2013. Este artigo parte integrante da Revista Recursos Hdricos, Vol. 34, N 1, 63-73, maio de 2013..

Comparao dos modelos HEC-RAS e LISFLOOD-FP na delimitao de zonas inundveis

Evaluation of HEC-RAS and LISFLOOD-FP models for predicting river flood inundation

Paulo Fernandez 1, Sandra Mourato 2, Madalena Moreira 3

1 - Professor Adjunto /// Instituto Politcnico de Castelo Branco - Escola Superior Agrria /// email: palex@ipcb.pt
2 - Professora Adjunta /// Instituto Politcnico de Leiria - Escola Superior de Tecnologia e Gesto /// email: sandra.mourato@ipleiria.pt
3 - Professora Auxiliar /// Universidade de vora - Escola de Cincias e Tecnologia /// email: mmvmv@uevora.pt

RESUMO
Este artigo apresenta os resultados da avaliao e comparao do desempenho de dois modelos hidrulicos, o modelo HEC-RAS e o modelo LISFLOOD-FP, na delimitao das zonas inundveis. feita a aplicao a um troo de 4 km do rio Lis. O hidrograma de cheia estimado atravs do modelo hidrolgico HEC-HMS, calibrado com base nos registos em duas estaes hidromtricas instaladas na rede hidrogrfica do rio Lis, adotando como parmetro de calibrao o nmero de escoamento. Os dois modelos hidrulicos so calibrados para um evento de inundao ocorrido em outubro de 2006, tomando como parmetros de calibrao os coeficientes de Manning no leito e nas zonas adjacentes. A comparao dos resultados dos dois modelos hidrulicos HEC-RAS e LISFLOOD-FP, para um evento de precipitao com o perodo de retorno de 100 anos, permite concluir que as zonas inundadas previstas pelos dois modelos apresentam resultados com sobreposio de 65% da reunio das reas obtidas, que o tempo de resposta da cheia ao longo do troo em estudo no modelo HEC-RAS cerca de metade do tempo de resposta no modelo LISFLOOD-FP e que o tempo de simulao do LISFLOOD-FP muito superior ao tempo consumido pelo modelo HEC-RAS.

Palavras-chave: Modelao hidrulica, zonas inundveis, HEC-RAS, LISFLOOD-FP, SIG.

ABSTRACT
Two hydraulic flood models (HEC-RAS and LISFLOOD-FP) are tested on a 4km stretch of the river Lis. The HEC-HMS hydrologic model estimates the flood hydrograph. HEC-RAS is calibrated using curve numbers as free parameters against records of hydrometric stations installed in the river Lis basin. The two hydraulic models are calibrated using floodplain and channel friction as free parameters, against observed inundated from a flood event occurred in October 2006. The results show that for this reach and return period of 100 years both HEC-RAS and LISFLOOD-FP models give predictions of 65% overlapped inundated areas. The floodwave travel time for HEC-RAS model was about half of the floodwave travel time for LISFLOOD-FP. LISFLOOD-FP has a simulation time much longer than HEC-RAS model.

Keywords: Hydraulic modelling, flood inundation, HEC-RAS, LISFLOOD-FP, GIS.

 

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