Hydrology Research (Apr 2023)
Global hydrological parameter estimates to local applications: Influence of forcing and catchment properties
Abstract
Data scarcity in many areas around the world represents a major problem for hydrological model calibrations. Global parameter estimates and global forcing can provide possibilities to access hydrological responses in ungauged regions. In this study, we applied HBV global parameter estimates considering uncertainty in the Upper Neckar and Upper Danube catchments, Germany, to answer what are the influencing factors and how good are their local applications. We tested simulations with precipitation in spatial resolutions from 0.05 to 0.2° and with local/global sources. Results show that the general performance is acceptable to good (Kling-Gupta efficiency, KGE: 0.51–0.79) in both catchments using local or global precipitation. The influence of spatial resolutions is insignificant while using local precipitation slightly increases performance in both catchments. Catchment properties such as complex topography and special karst subsurface may lead to a deterioration of performance by 0.2 of median KGE in the Upper Danube compared with the Upper Neckar catchment. The median correlation coefficient, runoff ratio and relative error suggest that using global parameter estimates can reproduce seasonality and long-term water balance in our studied region. Our study highlights the potential of using global parameter estimates and global forcing in ungauged areas. HIGHLIGHTS Global parameter estimates with global forcing can produce acceptable local discharge simulations in our study area.; Catchment properties have more impacts on local applications than sources and spatial resolutions of forcing when applying global parameter estimates.; Our study highlights the potential of using global forcing to understand hydrological behavior and water balance at a monthly scale in ungauged areas.;
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