Importance of Spatial Resolution in Global Groundwater Modeling

Ground Water
Robert ReineckePetra Döll

Abstract

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

References

Dec 6, 2005·Ground Water·Henk M Haitjema, Sherry Mitchell-Bruker
Feb 23, 2013·Science·Y FanG Miguez-Macho
Nov 20, 2013·The Hastings Center Report·James L Bernat
Oct 4, 2019·Nature·Inge E M de GraafMarc F P Bierkens

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