Aplicação do SWMM para Modelagem Hidrológico-Hidráulica em uma Grande Bacia de um Rio Costeiro

Abstract

The influence of physical and hydrological parameters involved in the rainfall-flow transformation in a watershed makes this process complex and dynamic. The present work evaluated the hydrological response for the Cocó river basin, which has rural and urban characteristics, using the Storm Water Management Model SWMM software. The basin was modeled under moderate precipitation condition and tidal influence on its outflow, reconstructed from the harmonic method. The discretization of the area under study in drainage sub-basins was performed, a runoff model, a map of land use and occupation using tools based on GIS Geographic Information Systems were developed and the physical parameters were estimated. and spatial of each sub-basin and drainage sections. The results showed that SWMM simulated the flows in the drainage sections of the rural sub-basins with average deviation around 8.6% of the measured flow in the field. For stretches under marine influence, near the mouth of the Cocó river, the results showed that what SWMM was able to simulate with good precision the effect of the tide by describing the complete tidal oscillation in the estuarine stretches. Moreover, for these stretches, the fit between the measured and modeled flows resulted in Nash-Sutcliffe coefficients around 0.6, which were considered satisfactory. In summary, the results obtained and the proposed model have the potential to assist in the integrated management of rural, urban and coastal waters.