History Of Egypt And Southwestern Part Of Egypt

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In the past periods, the northwestern part of Sudan and southwestern part of Egypt (Kehl and Bornkamm, 1993) were with great effective moisture, which are evident from archaeological sites associated with remnants of playa or lake deposits. This was the source of recharge in the NSAS. The estimated recharge rates of the pluvial period were a little high at the Uweinat highlands and central Sudan area (7–15 mm/year), and low in northern Sudan and southern Egypt area (6–8 mm/year) (Fig. 13). During the filling-up process, the high hydraulically conductive sandstones (~ 4.4×10-5 to 1.3×10-4 ms-1) in the area between central Sudan and Uweint–Asawn uplift were filled up with water to the surface with a general flow in a NE direction from Erdi…show more content…
The groundwater flow from the foothills of the Uweinat highlands has followed the relief of the underlying basement rocks. As the aquifer became full and the groundwater level rose to the ground surface at the Uweinat area, the excess precipitation has formed drainage systems flowing in an ENE direction (Fig. ) to the Tushka depression. This is evidenced from processing of the Radarsat and SRTM images over this area. Therefore, these surface drainages were drained the excess water above the surface away from the system. The groundwater has flowed northeastwards from Uweinat foothills within the Dakhla Basin from Dakhla to Farafa and from Farafra to Bahariya oasis. Provided that the spatial distribution of the high hydraulically conductive sandstones within the Basin, which covered the Precambrian basement slopping northwards. In addition to, the ages of groundwater samples increase progressively along the groundwater flow direction within the Dakhla Basin. Krypton-81 and chlorine-36 (Sturchio et al., 2004; Patterson et al., 2005) show a progression of groundwater ages from Dakhla oasis (~210–230 kyr) to Farafra oasis (~320–330 kyrs) with relatively high flow velocities (~1 m/yr; 3.17 × 10-8 m/s) and with low flow velocities (~0.2 m/yr; 6.34 × 10-9 m/s) from the Farafra to
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