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Title: Aquifer recharge, depletion, and connectivity: Inferences from GRACE, land surface models, and geochemical and geophysical data

Journal Article · · Geological Society of America, Bulletin
DOI:https://doi.org/10.1130/B31460.1· OSTI ID:1394777
 [1];  [2];  [3];  [4];  [5]
  1. Western Michigan Univ., Kalamazoo MI (United States). Dept. of Geosciences; Assiut Univ. (Egypt). Geology Dept.
  2. Western Michigan Univ., Kalamazoo MI (United States). Dept. of Geosciences
  3. Western Michigan Univ., Kalamazoo MI (United States). Dept. of Geosciences; Suez Canal Univ., Ismailia (Egypt). Geology Dept.
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Environmental Science Division
  5. Assiut Univ. (Egypt). Geology Dept.

We used data from the Gravity Recovery and Climate Experiment (GRACE) and outputs of the CLM4.5 model to estimate recharge and depletion rates for large aquifers, investigate the connectivity of an aquifer's subbasins, and identify barriers and preferred pathways for groundwater flow within an aquifer system. The Nubian Sandstone Aquifer System and its subbasins (Dakhla, Northern Sudan Platform, and Kufra) in northeast Africa were used for demonstration purposes, and findings were tested and verified against geological, geophysical, remote sensing, geochronologic, and geochemical data. There are four major findings. (1) The average annual precipitation data over recharge areas in the southern Kufra section and the Northern Sudan Platform subbasin were estimated at 54.8 km3, and 32.8 km3, respectively, and knowing the annual extraction rates over these two areas (similar to 0.40 ± 0.20 km3), recharge rates were estimated at 0.78 ± 0.49 km3/yr and 1.44 ± 0.42 km3/yr, respectively. (2) GRACEderived groundwater depletion rates over the Dakhla subbasin and the Northern Kufra section were estimated at 4.44 ± 0.42 km3/yr and 0.48 ± 0.32 km3/yr, respectively. (3) The observed depletion in the southern parts of the Dakhla subbasin is apparently caused by the presence of the east- west- trending Uweinat-Aswan basement uplift, which impedes the south-to-north groundwater flow and hence reduces replenishment from recharge areas in the south. (4) A major northeast- southwest- trending shear zone (Pelusium shear system) is apparently providing a preferred groundwater flow pathway from the Kufra to the Dakhla subbasin. Thus, inte-grated approach provides a replicable and cost-effective model for better understanding of the hydrogeologic setting of large aquifers worldwide and for optimum management of these groundwater resources.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
AC02-06CH11357; 2000007141
OSTI ID:
1394777
Journal Information:
Geological Society of America, Bulletin, Vol. 129, Issue 5-6; ISSN 0016-7606
Publisher:
Geological Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 50 works
Citation information provided by
Web of Science

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Cited By (5)

Use of Geophysical and Remote Sensing Data for Assessment of Aquifer Depletion and Related Land Deformation journal January 2018
Rock-water interaction processes based on geochemical modeling and remote sensing applications in hyper-arid environment: cases from the southeastern region of Egypt journal September 2018
Forecasting GRACE Data over the African Watersheds Using Artificial Neural Networks journal July 2019
Multi-Scale Hydrologic Sensitivity to Climatic and Anthropogenic Changes in Northern Morocco journal December 2019
Groundwater Quality Patterns and Spatiotemporal Change in Depletion in the Regions of the Arabian Shield and Arabian Shelf journal October 2019

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