Evaluación de los modelos hidrológicos HEC-HMS Y HBV-light en la Subcuenca del Río Tomebamba

Abstract

This research aims to represent the hydrological behavior of the Tomebamba River Subbasin through the evaluation of rain-runoff generation processes in two monitoring points: The Surucucho hydrological station and The Matadero hydrological station. In order to evaluate the behavior within the study area, two hydrological models were established: HEC-HMS and HBV-light according with bibliographical data. The results based on the KGE goodness index showed that in the calibration stage were insufficient for Surucucho and satisfactory for Matadero for both models. Based on these results, it was determined that HBV-light has a better overall performance because KGE values were higher than those obtained in HEC-HMS. Likewise, for the validation stage, HBV-light has higher values of KGE than HEC-HMS in both monitoring points. By incorporating different land uses into the modeling, it was found that HEC-HMS considers the variation in land use contrary to HBV- light where this factor is not important. Finally, the sensitivity analysis shows that lag time and curve number are the most sensitive parameters in HEC-HMS, while the most influential parameters in the simulation in HBVlight are the soil moisture value above which AET reaches PET, and the parameter that determines the relative contribution to runoff from rain.