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

Mohamed, Ahmed; Sultan, Mohamed; Ahmed, Mohamed; Yan, Eugene; Ahmed, Ezzat

doi:10.1130/B31460.1

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

Journal Article · Thu Dec 22 00:00:00 EST 2016 · Geological Society of America, Bulletin

DOI:https://doi.org/10.1130/B31460.1· OSTI ID:1394777

Mohamed, Ahmed ^[1]; Sultan, Mohamed ^[2]; Ahmed, Mohamed ^[3]; Yan, Eugene ^[4]; Ahmed, Ezzat ^[5]

Western Michigan Univ., Kalamazoo MI (United States). Dept. of Geosciences; Assiut Univ. (Egypt). Geology Dept.
Western Michigan Univ., Kalamazoo MI (United States). Dept. of Geosciences
Western Michigan Univ., Kalamazoo MI (United States). Dept. of Geosciences; Suez Canal Univ., Ismailia (Egypt). Geology Dept.
Argonne National Lab. (ANL), Argonne, IL (United States). Environmental Science Division
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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Aeronautic and Space Administration (NASA)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1394777

Journal Information:: Geological Society of America, Bulletin, Journal Name: Geological Society of America, Bulletin Journal Issue: 5-6 Vol. 129; ISSN 0016-7606

Publisher:: Geological Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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

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