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The main objective of this study was to evaluate the use of TOPMODEL, a conceptual physically based hydrological model, to improve the comprehension of flow generation mechanisms in a sub-tropical meso-scale basin. With an area of 59 km, the basin is located in the headwaters of Corumbataí river, one of the main tributaries of the Piracicaba river basin, county of Analândia, São Paulo state, Brazil. Calibration was performed in 15 day periods during the wet seasons of the 92/93 and 93/94 hydrological years, employing hourly data of flow, precipitation and evapotranspiration. Considering that this model is physically based, field measurements of soil hydraulic properties were performed in order to analyze the actual meaning of the parameters. The Monte Carlo method was employed to estimate parameters and the sensitivity analysis was accomplished by using the KolmogorovSmirnov test for two samples. This test compares the distribution of the satisfactory and unsatisfactory values of a given parameter based on the Nash and Sutcliffe efficiency. This preliminary evaluation of TOPMODEL allowed an analysis of the flow generation processes in this particular region through a comparison of calibrated and measured parameters and the suggestion of some possible modifications to enhance representation of the real processes. The model showed a good potential for further use but local adaptations must be studied.

ANÁLISE DA REPRESENTATIVIDADE FÍSICA DOS PARÂMETROS DO TOPMODEL EM UMA BACIA DE MESO ESCALA LOCALIZADA NAS CABECEIRAS DO RIO CORUMBATAÍ, SÃO PAULO.