Challenges in developing a global gradient-based groundwater model (G 3 M v1.0) for the integration into a global hydrological model

In global hydrological models, groundwater (GW) is typically represented by a bucket-like linear groundwater reservoir. Reservoir models, however, (1) can only simulate GW discharge to surface water (SW) bodies but not recharge from SW to GW, (2) provide no information on the location of the GW tabl...

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Bibliographic Details
Published in:Geoscientific Model Development 2019-06, Vol.12 (6), p.2401-2418
Main Authors: Reinecke, Robert, Foglia, Laura, Mehl, Steffen, Trautmann, Tim, Caceres, Denise, Doll, Petra
Format: Article
Language:English
Subjects:
Calibration
Computer simulation
Data assimilation
Data collection
Elevation
Evapotranspiration
Groundwater
Groundwater flow
Groundwater reservoirs
Groundwater resources
Groundwater table
Hydraulics
Hydrologic models
Hydrology
Mountainous areas
Mountains
Piezometric head
Recharge
Resolution
Rivers
Scale models
Semi arid areas
Sensitivity
Sensitivity analysis
Spatial resolution
Surface water
Water
Water bodies
Water discharge
Water resources
Water table
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Summary:In global hydrological models, groundwater (GW) is typically represented by a bucket-like linear groundwater reservoir. Reservoir models, however, (1) can only simulate GW discharge to surface water (SW) bodies but not recharge from SW to GW, (2) provide no information on the location of the GW table, and (3) assume that there is no GW flow among grid cells. This may lead, for example, to an underestimation of groundwater resources in semiarid areas where GW is often replenished by SW or to an underestimation of evapotranspiration where the GW table is close to the land surface. To overcome these limitations, it is necessary to replace the reservoir model in global hydrological models with a hydraulic head gradient-based GW flow model.
ISSN:1991-9603
1991-959X
1991-962X
1991-9603
1991-962X
DOI:10.5194/gmd-12-2401-2019