Application of the hydrologic model SWMM in the evaluation of different levels of catchment discretization for rainfall-runoff simulation / Aplicação do modelo hidrológico SWMM na avaliação de diferentes níveis de detalhamento da bacia hidrográfica submetida ao processo de transformação chuva-vazão

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

For the last years, the distributed hydrological models have been recognized by allowing the incorporation of the spatial variability of catchment characteristics for rainfall-runoff simulation. However, due to this ability, the distributed models tend to be mathematically complex and to require many parameters to be measured or estimated. Although the literature presents several works that attempt to ascertain the level of discretization more appropriate to represent the various systems, the results are contradictory, showing the need for further studies. This work proposes and evaluates different levels of representation of the watershed of the Gregory Creek in the city of São Carlos, SP, under rainfall-runoff simulation, by applying the hydrologic model Storm Water Management Model - SWMM. The calibration of the events, needed to adequacy the model parameters, used as tool the genetic algorithm, producing satisfactory results, with values of Nash and Sutcliffe (1970) efficiency coefficients ranging between 0,74 and 0,87, varying from event to event . In general, the results showed the importance of considering the micro-drainage in the systems representation. For more frequent events, by increasing the level of catchment representation, the velocity of flow became greater, resulted from the low roughness of the conduits, and, therefore, higher peak flows rates were found. The results also emphasized the influence of the impervious areas on the hydrographs, confirming the great importance of careful determination of this parameter.

ASSUNTO(S)

parâmetros swmm swmm urban drainage parameters drenagem urbana modelos chuva-vazão calibração rainfall-runoff calibration

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