The impact of hydrological model structure on the simulation of extreme runoff events

Summary

This study examined how differences in hydrological model structure influence predictions of extreme runoff events by combining the FUSE modular modelling framework with large ensemble meteorological simulations across four climate zones. The research found that model structure had greater impact on low-flow extremes than high-flow extremes, and that this impact varied substantially between climate zones, with cold and temperate regions showing larger sensitivity to process formulations such as evaporation than arid and tropical regions. These findings provide guidance for selecting appropriate model structures when simulating hydrological extremes in different climatic contexts.

UK applicability

The findings are potentially relevant to UK water resource management and flood prediction given the United Kingdom's temperate climate zone classification, where the study found significant sensitivity of extreme runoff simulation to hydrological process formulations. However, the paper does not explicitly address UK catchments or policy, so applicability would depend on whether UK hydrological models align with the tested model structures.

Key measures

Magnitude and timing of simulated extreme runoff events (high-flow and low-flow); return period analysis; comparison across hydrological model structures and climate zones

Outcomes reported

The study quantified how different hydrological model structures affect the magnitude and timing of simulated extreme high- and low-flow events across four climate zones using ensemble meteorological simulations. Model structure impact varied significantly by climate zone and flow regime, with larger effects on low-flow compared to high-flow events.

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