Resumo

GUACHAMIN, Wilmer; PAEZ-BIMOS, Sebastián  e  HORNA, Natalia. Evaluation of IMERG V03 and TMPA V7 products in the detection of flood events in Cañar river basin. Rev Politéc. (Quito) [online]. 2019, vol.42, n.2, pp.31-48. ISSN 2477-8990.

The satellite precipitation products, such as Tropical Rainfall Measuring (TRMM) and it is successor Global Precipitation Measurement (GPM), provide precipitation data for hydrological applications in basins without data or with scarce information. The purpose of this paper is to evaluate satellite-based products IMERG V03 and TMPA V7, for hydrological modeling and the potential detection of flood discharges in the Cañar river basin. The evaluation of IMERG V03 and TMPA V7 satellite products at a different spatio-temporal resolutions of 0.1°x 0.1° (10 x 10 km) 1 hour, and 0.25° x0.25° (25 x 25 km) 3 hours respectively, at events during the period March 2014 – December 2015, shows that the rainfall intensity is underestimated. This is related to the disperse rain gages, which do not register in a proper manner the rainfall events, as well as the mountainous topography of the terrain. The results show that the satellite-based products improve the rainfall spatial distribution registered by rain gages, when including correction methods such as Double Kernel Smoothing (DS) and Residual Inverse Distance Weighting (RIDW). The evaluation of the correction methods was carried out by comparing discharges simulated with the hydrological model HEC-HMS and observed ones. When applying the DS and RIDW methods to IMERG V03 and TMPA V7 products, the hydrological model is able to produce discharges that are closer to the observed ones. Moreover, the calibrated hydrologic model HEC-HMS can simulate discharges that fit the flood events for all both satellite-based products (IMERG V03 and TMPA V7), when these products register a high probability for detection (POD) and a high rainfall intensity. The results show the potential of satellite products merged with rainfall observations for the simulation of flood discharges in basins with scarce rainfall data.

Palavras-chave : IMERG; TMPA; DS; RIDW; modelling; flood events.

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