Análisis de precipitación en la cuenca de Catamayo durante diciembre 2024 y enero 2025 a partir de imágenes del radar GUAXX

Abstract

Abstract:Precipitation detection in Andean regions is limited by the sparse spatial coverage of meteorological stations, giving remote systems, such as weather radars, an advantage. In this study, the reflectivity products (PPI) of the GUAXX radar in the Catamayo River basin were calibrated during December 2024 and January 2025 by integrating them with records from 14 rain gauge stations. The calibrated reflectivity images (PPI) were used to evaluate the accuracy of the precipitation quantity (PAC) products, which were automatically generated by the radar's proprietary software, applying the standard Marshall-Palmer Z-R relationship ( = 2001.6). The results of the comparison between the calibrated PPI images and the PAC images at independent points indicated coefficients of determination of 2 = 0.3186 in December and 2 = 0.6414 in January, which demonstrates the limitations associated with the standard Z-R relationship, since the parameters of the equations depend on the type of precipitation and its intensity, so these must be determined specifically for each region and season of the year.