GroMoPo Metadata for Nubian Aquifer System model

Authors:

GroMoPo Mark Cuthbert

Owners:

gromopo_admin

Type:

Resource

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The size of this resource is 1.8 KB

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°

Streets Terrain Satelite

Spatial Extent

Content

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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

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/

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