期刊
SUSTAINABILITY
卷 14, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/su14116823
关键词
NSAS; groundwater flow model; ages data
资金
- Abdullah Alrushaid Chair for Earth Science Remote Sensing Research
The Nubian Sandstone Aquifer System (NSAS) is a large groundwater system consisting of three major sub-basins. This study used a combination of groundwater flow modeling and isotopic data to investigate the system's hydrologic setting and connectivity. It found that the NSAS was recharged during wet climatic periods and identified preferential groundwater flow conduits and hindrances.
The Nubian Sandstone Aquifer System (NSAS) is made up of three major sub-basins: Kufra, Dakhla, and the N. Sudan Platform. It is one of the world's largest groundwater systems. The aquifer's hydrologic setting, connectivity of its sub-basins, and groundwater flow across these sub-basins are currently unclear. To address these issues, we used a combined approach that included: (1) a regionally calibrated groundwater flow model that mimics early (>10,000 years) steady-state conditions under wet climatic periods and later (<10,000 years BP-1960; 1960-2010) transient conditions under arid climatic periods; and (2) groundwater ages (Cl-36, Kr-81) and isotopic (O-18, H-2) data. The NSAS was recharged on a regional scale in previous wet climatic periods; however, in dry periods, its outcrops are still receiving local modest recharge. A progressive increase in Cl-36 groundwater ages was found along groundwater flow directions and along structures that are sub-parallel to the flow direction. The NE-SW Pelusium mega shear zone is a preferential groundwater flow conduit from the Kufra to the Dakhla sub-basin. The south-to-north groundwater flow is hampered by the Uweinat-Aswan basement uplift. The findings provide useful information about the best ways to use the NSAS.
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