Spatial-Temporal Evaluation of Satellite-Derived Rainfall Estimations for Water Resources Applications in the Upper Congo River Basin

Author:

Boluwade Alaba1

Affiliation:

1. University of Prince Edward Island

Abstract

Abstract Satellite rainfall estimates are robust alternatives to gauge precipitation, especially in Africa, where several watersheds and regional water basins are poorly gauged or ungauged. In this study, six satellite precipitation products: the Climate Hazards Group Infrared Precipitation with Stations (CHIRPS); Tropical Applications of Meteorology Using Satellite and Ground-based Observations (TAMSAT); Tropical Rainfall Measuring Mission (TRMM); and the National Aeronautics and Space Administration’s new Integrated Multi-Satellite Retrievals for Global Precipitation Measurement (GPM) early run (IMERG-ER), late run (IMERG-LR) and final run (IMERG-FR) are used to force a gauge-calibrated Soil & Water Assessment Tool (SWAT) model for the Congo River Basin, Central Africa. In this study, the National Centers for Environmental Prediction's Climate Forecast System Reanalysis (CFSR) calibrated version of the SWAT was used as the benchmark/reference while scenario versions will be created as configurations using each satellite product identified above. CFSR was used as an independent sample, to prevent bias towards any of the satellite products. The calibrated CFSR model captured and reproduced the hydrology (timing, peak flow & seasonality) of this basin using the average monthly discharge from Jan,1984- Dec,1991. Furthermore, the results show that TRMM, IMERG-FR, and CHIRPS captured the peak flows and correctly reproduced the seasonality and timing of the monthly discharges (Jan 2007- Dec 2010). In contrast, TAMSAT, IMERG-ER, and IMERG-LR overestimated the peak flows. These results show that some of these precipitation products must be bias corrected before being used for practical applications. The results of this study will be significant in integrated water resources management in the Congo River Basin and other regional river basins in Africa. Most important, the results obtained from this study has been hosted in a repository for free access to all interested in hydrology and water resources management in Africa

Publisher

Research Square Platform LLC

Reference47 articles.

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