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GroMoPo Metadata for Nubian Aquifer System model


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Created: Feb 06, 2023 at 7:16 p.m.
Last updated: Feb 06, 2023 at 7:16 p.m.
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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.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Chad, Egypt, Lybia, Sudan
North Latitude
31.1245°
East Longitude
32.3332°
South Latitude
17.3148°
West Longitude
18.7611°

Content

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

GroMoPo, M. Cuthbert (2023). GroMoPo Metadata for Nubian Aquifer System model, HydroShare, http://www.hydroshare.org/resource/1d0dcf9ec9ef493884358852146119ec

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/
CC-BY

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