Modelación hidrológica en la cuenca del río puyango mediante el modelo gr4j: evaluar la respuesta hidrológica aplicando los métodos de evapotranspiración incorporados en el software rs minerve.

Abstract

The present investigation was carried out with the purpose of evaluating the hydrological response of the Puyango river basin with its mouth at the Puyango station with code H0591, located at the height of the Las Lajas and Puyango cantons, for which the GR4J model and the evapotranspiration estimation methods included in the RS Minerve software were used. Prior to the hydrological modeling, the cartographic analysis was carried out to determine the geomorphological parameters and discretize the basin into seven hydrological units or sub-basins, as well as the statistical analysis of the information on precipitation, temperature, and flow to homogenize and fill in the time series. Subsequently, the hydrological modeling was carried out for the period from January 1982 to December 1988, of which the first five years were used to perform the calibration and the remaining two to validate the model. During these processes, the performance of the model was evaluated through statistical indicators, of which, to carry out a multi-objective calibration, greater weight was given to Nash, Nash for logarithm values, Pearson's correlation coefficient and root of the relative mean square error (RRMSE). As a result of the simulation of the three methods used, that of Turc and Mc Guinness were the ones that obtained the best results. With the Turc method, Nash values were obtained from Nash (0.81 - 0.56), Nash ln (0.85 - 0.79), Pearson (0.94 - 0.93) and RRMSE (0.47 - 0.64), while the McGuinness method reached values for Nash (0.78 - 0.45), Nash ln (0.82 - 0.78), Pearson (0.93 - 0.91) and RRMSE (0.52 - 0.71).