Analysis On The Nubian Sandstone Aquifer System

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The integrated geophysical, remote sensing, isotopic and geochronologic and modelling studies on the Nubian Sandstone Aquifer System have come up with the following findings and recommendations:
1- Geophysical studies:
Based on the integration of gravity, magnetic, and borehole data the structural trends, uplifts and sedimentary cover affecting the aquifer behavior have been conducted. The area of the NSAS is affected by several structural trends in different directions; the most prominent directions are NE–SW, N–S, E–W, and NW–SE. The dominant NE-SW trend is associated with the Pelusium and Qattara mega shears.

The sedimentary cover shows a northward increase from less than 0.5 km in northern Sudan and southern Egypt to more than 6 km at the Mediterranean coast. The sediments thickness shows a shallowing of the basement rocks along the east-west trending Uweinat-Aswan basement uplift which may impede the south to north groundwater flow and replenishment from the recharge areas in the south.

The NE-SW trending Pelusium mega shear cuts the Precambrian rocks and continues upward in the sedimentary cover; it formed deep structural controlled basins along its zone, which were filled by high thick sediments of relatively high hydraulic conductivities extending from the Kufra Basin in Libya and Chad to the northern part of Dakhla Basin in Egypt. This zone could provide a preferred groundwater flow pathway from the Kufra to the Dakhla Basin.

2- Climatically (GRACE & CLM4.5):

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