Preprints
https://doi.org/10.5194/hess-2024-336
https://doi.org/10.5194/hess-2024-336
06 Nov 2024
 | 06 Nov 2024
Status: this preprint is currently under review for the journal HESS.

Using global reanalysis and rainfall-runoff model to study multi-decadal variability in catchment hydrology at the European scale

Pierre Brigode and Ludovic Oudin

Abstract. This study explores the ability of global reanalyses to simulate catchment hydrology at the European scale using a conceptual rainfall–runoff model. We used two reanalyses, NOAA 20CR and ERA-20C, to simulate daily streamflows for over 2000 catchments since the 1840s. Our findings show that both reanalyses perform well, particularly for mean flows, with simulation performance improving as catchment size increases, though challenges remain for Mediterranean and snow-dominated regions. Additionally, the study highlights significant multi-decadal variations in streamflow, revealing alternating wet and dry periods across Europe. These findings provide valuable insights into long-term hydrological trends and offer a useful framework for understanding future changes in both water resources and hydrological extremes, such as floods, under climate variability.

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Pierre Brigode and Ludovic Oudin

Status: open (until 25 Dec 2024)

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Pierre Brigode and Ludovic Oudin
Pierre Brigode and Ludovic Oudin

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Short summary
We analyzed how well two global climate datasets can simulate river flows across Europe over the last 150 years. Our results show good performance overall, revealing important long-term changes in water availability and extreme events, like floods, in different regions. This research helps us better understand past and future water trends, providing insights to manage resources and address the challenges posed by climate change.