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Type: | Resource | |
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Created: | Feb 06, 2023 at 7:17 p.m. | |
Last updated: | Apr 17, 2023 at 2:46 p.m. | |
Citation: | See how to cite this resource |
Sharing Status: | Public |
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Views: | 514 |
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Abstract
Groundwater is the world's largest accessible source of fresh water. It plays a vital role in satisfying basic needs for drinking water, agriculture and industrial activities. During times of drought groundwater sustains baseflow to rivers and wetlands, thereby supporting ecosystems. Most global-scale hydrological models (GHMs) do not include a groundwater flow component, mainly due to lack of geohydrological data at the global scale. For the simulation of lateral flow and groundwater head dynamics, a realistic physical representation of the groundwater system is needed, especially for GHMs that run at finer resolutions. In this study we present a global-scale groundwater model (run at 6 0 resolution) using MODFLOW to construct an equilibrium water table at its natural state as the result of long-term climatic forcing. The used aquifer schematization and properties are based on available global data sets of lithology and transmissivities combined with the estimated thickness of an upper, unconfined aquifer. This model is forced with outputs from the land-surface PCRaster GlobalWater Balance (PCR-GLOBWB) model, specifically net recharge and surface water levels. A sensitivity analysis, in which the model was run with various parameter settings, showed that variation in saturated conductivity has the largest impact on the groundwater levels simulated. Validation with observed groundwater heads showed that groundwater heads are reasonably well simulated for many regions of the world, especially for sediment basins (R-2 = 0.95). The simulated regional-scale groundwater patterns and flow paths demonstrate the relevance of lateral groundwater flow in GHMs. Inter-basin groundwater flows can be a significant part of a basin's water budget and help to sustain river baseflows, especially during droughts. Also, water availability of larger aquifer systems can be positively affected by additional recharge from inter-basin groundwater flows.
NOTE: Model has global extent, bounding box is positioned over the Atlantic Ocean for visibility.
Subject Keywords
Coverage
Spatial
Content
Additional Metadata
Name | Value |
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DOI | 10.5194/hess-19-823-2015 |
Depth | |
Scale | Global |
Layers | |
Purpose | groundwater resources |
GroMoPo_ID | 5 |
IsVerified | True |
Model Code | MODFLOW |
Model Link | https://doi.org/10.5194/hess-19-823-2015 |
Model Time | SS |
Model Year | 2015 |
Model Authors | Inge de Graaf |
Model Country | Global |
Data Available | input and output publicly available |
Developer Email | |
Dominant Geology | Model focuses on multiple geologic materials |
Developer Country | |
Publication Title | A high-resolution global-scale groundwater model |
Original Developer | |
Additional Information | model result: groundwater table depth (m below surface) at 5-arcminutes resolution |
Integration or Coupling | Surface water;Water use |
Evaluation or Calibration | static water levels |
Geologic Data Availability |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
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