Comparison of Gridded and Measured Rainfall Data for Basin-scale Hydrological Studies

• Published in: Chilean journal of agricultural research 2011-09, Vol.71 (3), p.459-468
• Main Authors: Muñoz, Enrique, Álvarez, César, Billib, Max, Arumí, José Luis, Rivera, Diego
• Format: Article
• Language: English
• Subjects: Agricultural production; AGRICULTURE, MULTIDISCIPLINARY; AGRONOMY; Climate change; Comparative studies; Datasets; Flow velocity; Hydroelectric plants; Hydrology; Irrigation; Precipitation; Rain; Rivers; Simulation; Watersheds
• ISSN: 0718-5839; 0718-5820; 0718-5839
• DOI: 10.4067/S0718-58392011000300018

Global gridded climatological (GGC) datasets, including precipitation and temperature, are becoming more and more precise, accessible, and common, but the utility of these datasets and their limits for hydrological research are still not well determined. In this paper, we compare the performance of two hydrological models that are identical in structure but built with two different inputs: rainfall from rain gauge stations and from a GGC dataset. The objective is to evaluate the utility of gridded datasets in water resource availability studies mainly for hydroelectric and agricultural purposes. The Andean basin of the Laja River, located in south-central Chile, was chosen for this study. It was based on an 18-yr simulation, and it was concluded that i) with gridded climatological datasets in a monthly water balance model, it is possible to reproduce the behavior of an Andean basin with good goodness-of-fit, but with worse results than when using inputs from rain gauges; ii) the amount of rainfall in gridded datasets in the Andean area of the Laja basin is underestimated and damped, an effect which is transferred to the simulated flows; and iii) regarding the main activities in the Laja basin, global gridded datasets are useful for hydrological studies with agricultural purposes prior to a treatment that considers the orographic effect. On the other hand, these datasets are useless for hydroelectric purposes due to the large underestimation of peak flows obtained during the rainy season. Comparación de datos de precipitación grillados y medidos para estudios hidrológicos a escala de cuenca. Datos grillados a escala mundial como precipitación y temperatura están siendo cada vez más precisos, accesibles y comunes, pero la utilidad de estos datos y sus limitaciones para estudios hidrológicos, todavía no están bien definidas. En este trabajo se compara el comportamiento de dos modelos hidrológicos, idénticos en estructura, pero construidos con dos entradas diferentes: la precipitación proveniente de estaciones pluviométricas y la precipitación proveniente de datos grillados a escala mundial. El objetivo es evaluar la utilidad de los datos grillados en estudios de disponibilidad de recursos hídricos, principalmente con fines hidroeléctricos y agrícolas. La cuenca andina del río Laja, ubicada en el centro-sur de Chile fue elegida para este estudio. Sobre la base de 18 años de simulación, se concluyó que i) con datos climatológicos grillados en un modelo de balan