Evaluación de productos GPM IMERG V03 y TMPA V7 en la detección de crecidas caso de estudio cuenca del río Cañar

Abstract

The lack of temporal continuity and spatial coverage hydro-metereological information available from automatic and conventional rain gauges, restrict the availability of continuous series for precipitation in Ecuador. The purpose of this project is to evaluate satellite-based products IMERG V03 and TMPA V7 at a different spatio-temporal resolutions of 0.1°x 0.1° 1 hour, and 0.25° x0.25° 3 hours respectively, for flood events during the period March 2014 – December 2015, in the the Cañar river basin. The results show that the satellite-based products improve the spatial distribution registered by rain gages, when including correction methods such as Double Kernel Smoothing (DS), Mean Bias Correction, Residual Inverse Distance Weighting. For the hydrologic station of Puerto Inca, the evaluation of the correction methods was carried out by comparing simulated and observed discharges. It was observed that the corrected rainfall data, when applying the Double Kernel Smoothing(DS) and Residual Inverse Distance Weigthing (RIDW) methods on the hydrologic model, produces discharges that are closer to the observed ones. Moreover, the calibrated hydrologic model HEC-HMS performs well for all satellite-based products IMERG V03 and TMPA V7 for flood events, where these products register a high probability for detection (POD) and for high rainfall intensity.