Sedimentary cover in the South Western Desert of Egypt as deduced from Bouguer gravity and drill-hole data

Senosy, Mahmoud M.; Youssef, Mohamed Ahmed; Zaher, M. A.

doi:10.1016/j.jafrearsci.2013.02.001

Cited by 13 publications

(5 citation statements)

References 11 publications

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“…6). The depth to the basement rocks was then extracted using two dimensional (2D) models (grid size: 1° × 1°), where each of the 2D models was represented by three layers: a top sedimentary cover (average density: 2.60 g/cm 3 ; Senosy et al, 2013), a mid dle basement layer (average density: 2.8 g/cm 3 ; Gaulier et al, 1988;Marsouk, 1988;Saleh et al, 2006), and a lower uppermantle layer (average density: 3.25 g/cm 3 ; Gaulier et al, 1988;Mar souk, 1988;Saleh et al, 2006). Available well data (~2000 wells; Fig.…”

Section: Mapping Depth To Basement Using Gravity and Field Datamentioning

confidence: 99%

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

Anwar

Sultan

Yan

et al. 2016

Geological Society of America Bulletin

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Data from the Gravity Recovery and Climate Experiment (GRACE) and outputs of the CLM4.5 model were used 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 km 3 , and 32.8 km 3 , respectively, and knowing the annual extraction rates over these two areas (~0.40 ± 0.20 km 3 ), recharge rates were estimated at 0.78 ± 0.49 km 3 /yr and 1.44 ± 0.42 km 3 /yr, respectively. (2) GRACEderived groundwater depletion rates over the Dakhla subbasin and the Northern Kufra section were estimated at 4.44 ± 0.42 km 3 /yr and 0.48 ± 0.32 km 3 /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. Our 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.

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Section: Mapping Depth To Basement Using Gravity and Field Datamentioning

confidence: 99%

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

Anwar

Sultan

Yan

et al. 2016

Geological Society of America Bulletin

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“…It has high fertile lands and is the main Oasis which supports high population [10]. This is due to the large amount of groundwater presented in this locality, where the thickness of the NSSA ranges between 600 and 900 m. Therefore, this area should take a priority in the sustainable development project of southern Egypt [11]. The two main parameters should be under detailed study are soil suitability and water availability for crops [7].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Land Suitability and Water Requirements for Different Crops in Dakhla Oasis, Western Desert, Egypt

Fadl

Abuzaid

2017

IJPSS

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Land reclamation projects in Egypt have been directed towards the Western Desert; however, such expansion requires devoting land and water resources to the optimum use. Hence, the current work aimed at assessing land suitability and water requirements for various crops in an area located west of Dakhla Oasis. The geomorphic features were identified after the processing of Landsat 8.0 satellite image and Digital elevation model (DEM) verified by field and ground studies. Samples of thirty-one soil profiles and eleven water wells were collected and analyzed. Land suitability was assessed using MicroLEIS software with an Almagra model. The main geomorphic units are plateau, pediplain, depression and sand sheets. About 97% of the soils are suitable (high, moderate and marginal) for maize, sunflower, soya bean, wheat, sugar beet, cotton, watermelon, alfalfa, potato, peach, citrus, and olive. Water requirements for each crop were calculated using

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“…There have been numerous studies on the analysis of the lineaments in delineating basement and basin structures deduced from magnetic and gravity data (Berendsen et al, 1983;Johnsgard, 1983;Al Fasatwi and van Dijk, 1989;Fichler et al, 1999;Lyatsky et al, 2004;Hassan and Peirce, 2008;Aydogan, 2011;Davy et al, 2012;Feumoe and Ndougsa-Mbarga, 2012;Yutsis et al, 2012). Due to the fact that gravity anomalies can be caused by varying mass distributions at different depths, interpreting them is not a unique problem involving subsurface density structures (Blakely, 1996;Senosy et al, 2013). However, borehole data can be used as constraints to lessen the non-uniqueness problem.…”

Section: Open Access Edited Bymentioning

confidence: 99%

“…The gravitational and loading effect of the sediments was also calculated by taking the average density of the common rock types in El Kharga region (density: ~2.60 g/cm 3 ; Senosy et al, 2013). The gravitational effect in gal of the sedimentary sequence was determined using Eq.…”

Section: Gravity Effect Of the Sedimentary Covermentioning

confidence: 99%

Sedimentary cover and structural trends affecting the groundwater flow in the Nubian Sandstone Aquifer System: Inferences from geophysical, field and geochemical data

2023

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This study combined gravity data from the Earth Gravitational Model (EGM2008) with other data to better understand the spatial variations of the sedimentary cover and the structural trends that affect groundwater flow in the Nubian Sandstone Aquifer System. Our findings were verified and evidenced by geological, geochronological, geochemical data, and earthquake records: 1) The Uweinat-Aswan basement uplift, which runs east-west, partially isolates the Dakhla subbasin from the shallower northern Sudan subbasin, and thereby impeding the south-to-north groundwater flow from northern Sudan platform to the Dakhla subbasin; 2) A thickening of the sedimentary cover in the NE-SW direction from the southern Kufra through the northern Kufra to the Dakhla subbasin; 3) The sedimentary cover was found to increase from less than 500 m in the south (Northern Sudan and Uweinat region) to more than 6 km in the north (Mediterranean coast); 4) A number of structural trends (NE-SW, N-S, E-W, and NW-SE) affecting the region; 5) A large Pelusium megashear system that runs northeast to southwest makes it easier for groundwater to flow from the Kufra subbasin to the Dakhla subbasin; 6) Along the paths that groundwater takes, like from Siwa to Qattara and from northwest Farafra to north Bahariya, and along structures that run in the same direction as the flow, a progressive increase in 36Cl groundwater ages were observed; 7) It is a better way to learn about the hydrogeological context of large aquifers and figure out how to best manage these underground water sources.

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Sedimentary cover in the South Western Desert of Egypt as deduced from Bouguer gravity and drill-hole data

Cited by 13 publications

References 11 publications

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

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

Assessment of Land Suitability and Water Requirements for Different Crops in Dakhla Oasis, Western Desert, Egypt

Sedimentary cover and structural trends affecting the groundwater flow in the Nubian Sandstone Aquifer System: Inferences from geophysical, field and geochemical data

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