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| Created: | Feb 06, 2023 at 7:16 p.m. | |
| Last updated: | Feb 06, 2023 at 7:16 p.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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Abstract
Parsimonious groundwater modeling provides insight into hydrogeologic functioning of the Nubian Aquifer System (NAS), the world's largest non-renewable groundwater system (belonging to Chad, Egypt, Libya, and Sudan). Classical groundwater-resource issues exist (magnitude and lateral extent of drawdown near pumping centers) with joint international management questions regarding transboundary drawdown. Much of NAS is thick, containing a large volume of high-quality groundwater, but receives insignificant recharge, so water-resource availability is time-limited. Informative aquifer data are lacking regarding large-scale response, providing only local-scale information near pumps. Proxy data provide primary underpinning for understanding regional response: Holocene water-table decline from the previous pluvial period, after thousands of years, results in current oasis/sabkha locations where the water table still intersects the ground. Depletion is found to be controlled by two regional parameters, hydraulic diffusivity and vertical anisotropy of permeability. Secondary data that provide insight are drawdowns near pumps and isotope-groundwater ages (million-year-old groundwaters in Egypt). The resultant strong simply structured three-dimensional model representation captures the essence of NAS regional groundwater-flow behavior. Model forecasts inform resource management that transboundary drawdown will likely be minimal-a nonissue-whereas drawdown within pumping centers may become excessive, requiring alternative extraction schemes; correspondingly, significant water-table drawdown may occur in pumping centers co-located with oases, causing oasis loss and environmental impacts.
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.1007/s10040-013-1039-3 |
| Depth | |
| Scale | Regional |
| Layers | |
| Purpose | groundwater resources;scientific investigation;environmental impacts such as on discharges to oases |
| GroMoPo_ID | 4 |
| IsVerified | True |
| Model Code | MODFLOW |
| Model Link | https://doi.org/10.1007/s10040-013-1039-3 |
| Model Time | 10 000 years before present - present |
| Model Year | 2013 |
| Model Authors | Clifford I. Voss & Safaa M. Soliman |
| Model Country | Chad, Egypt, Lybia, Sudan |
| Data Available | report/paper only |
| Developer Email | |
| Dominant Geology | siliciclastic sedimentary (sandstones, shales) |
| Developer Country | |
| Publication Title | The transboundary non-renewable Nubian Aquifer System of Chad, Egypt, Libya and Sudan: classical groundwater questions and parsimonious hydrogeologic analysis and modeling |
| Original Developer | |
| Additional Information | The transboundary non-renewable Nubian Aquifer System of Chad, Egypt, Libya and Sudan: classical groundwater questions and parsimonious hydrogeologic analysis and modeling. |
| Integration or Coupling | None of the above |
| Evaluation or Calibration | static water levels;groundwater chemistry |
| Geologic Data Availability |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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