Importance of Spatial Resolution in Global Groundwater Modeling

摘要: Global-scale gradient-based groundwater models are a new endeavor for hydrologists who wish to improve global hydrological (GHMs). In particular, the integration of such into GHMs improves simulation water flows between surface and capillary rise thus evapotranspiration. Currently, these not able simulate table depth adequately over entire globe. Unsatisfactory model performance compared well observations suggests that higher spatial resolution is required better represent high variability land elevations. this study, we use New Zealand as testbed analyze impacts on results models. Steady-state hydraulic heads simulated by two versions G3 M, at resolutions 5 arc-minutes (9 km) 30 arc-seconds (900 m), with from Canterbury region. The output three other different analyzed well. Considering distribution residuals, general patterns unsatisfactory remain resolutions, suggesting an increase in alone does fix problems systematic overestimation head. We conclude (1) understanding how low-resolution can be evaluated required, (2) merely increasing global-scale will freshwater system.