Author(s): Laryssa Freitas; Maria Manuela Portela; Luis Angel Espinosa; Jose Matos

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Abstract: In mainland Portugal, the acquisition of ground-based hydrological data primarily relies on the Portuguese Institute for the Sea and the Atmosphere (IPMA) and the Portuguese Environment Agency (APA), through the National System of Information on Water Resources (SNIRH) database. However, these datasets often exhibit limitations, particularly at the sub-daily timescale, such as short lengths and frequent data gaps. To tackle these challenges, reanalysis data, particularly ERA5-Land, emerges as a valuable alternative dataset for hydrological variables. Recent studies have showcased a remarkable alignment between empirical non-exceedance probability curves obtained from ground-based stations and those from ERA5-Land reanalysis data, indicating the potential effectiveness of ERA5-Land precipitation data in assessing exceptional precipitation and, consequently, in establishing Intensity-Duration-Frequency (IDF) curves. This study delves into exploring this potential. The results achieved indicate a strong adjustment between dimensionless IDF curves for durations ranging from 6 to 120 hours. These findings underscore the promising utility of ERA5-Land in constructing IDF curves and highlight its potential to enhance hydrological analysis across the country. However, further investigations are warranted to fully assess its applicability and reliability in broader contexts.

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Year: 2024