Summary
This diagnostic evaluation compared two large-domain hydrologic models (mHM and VIC) calibrated using the Multiscale Parameter Regionalization scheme across 492 medium-sized basins in the contiguous United States. The study identified systematic overestimation of evapotranspiration in VIC relative to mHM and FLUXNET observations, which was attributed to differences in model structure and the prescribed nonlinear relationship between evaporative fraction and soil saturation. Despite these limitations, the VIC-based calibration showed improved evapotranspiration skill compared to pre-existing independent studies.
UK applicability
Whilst this study focuses on the United States hydrological context, its findings on model calibration methodology and the comparative performance of hydrologic models may inform UK water resource management and hydrological forecasting, particularly for large-domain models used in climate impact assessments. The diagnostic approach for evaluating evapotranspiration estimation could be applicable to UK catchment studies, though direct transferability would require recalibration to British catchment conditions.
Key measures
Streamflow, evapotranspiration (ET), evaporative fraction, soil saturation, model parameter sets, runoff variability
Outcomes reported
The study evaluated two large-domain hydrologic models (mHM and VIC) calibrated across 492 medium-sized basins in the contiguous United States, examining their ability to simulate streamflow and evapotranspiration. Key findings showed that VIC overestimated evapotranspiration magnitude and temporal variability compared to mHM and observation-based products, resulting in runoff underestimation.
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