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Evaluation of near-surface groundwater aquifers through integrated geophysical and geodetic measurements
Journal of King Saud University-Science ( IF 3.7 ) Pub Date : 2021-07-21 , DOI: 10.1016/j.jksus.2021.101549
Ali M. Radwan 1 , Sayed Bedair 2 , Khamis Mansour 1 , Kamal Abdelrahman 3 , Mohamed Rashwan 1 , Federica Sparacino 4, 5 , Mohammed S. Fnais 3
Affiliation  

Extensive geophysical and geodetic measurements were carried out to evaluate the groundwater aquifer, trace the basement relief, as well as detect the igneous intrusions and structural elements (mainly faults) that affect the occurrence of groundwater in the study area. The fieldwork included resistivity sounding, a geomagnetic survey, and Global Positioning System measurements. The magnetic results showed the presence of a group of main faults in East-west trend at the western part of the area and major fault at the northern part of the area of NW-SW trend. The findings also showed the presence of two igneous rock intrusions located in the middle of the eastern part of the valley. Pronounced differences in the depths of basement rocks have been identified, ranging between 0 and 900 m from the surface. Both high horizontal movements and high shear strain rates have been found to be concentrated at the southeast of the study area and it was noted that high stress was accumulated along the main observed faults and at the main groundwater aquifers. The geoelectrical results confirmed the presence of two aquifers; a shallow aquifer (Quaternary aquifer) that narrows northwards and a Nubian sandstone aquifer, which considered the main aquifer. The Nubian sandstone aquifer carries groundwater in the region, which overlies the last geoelectric unit represented by the basement complex layer and geological structures affecting the potential availability of groundwater in the study area, as proved by the geomagnetic survey and stress accumulation.



中文翻译:

通过综合地球物理和大地测量评估近地表地下水含水层

进行了广泛的地球物理和大地测量,以评估地下水含水层,追踪基底起伏,以及检测影响研究区地下水发生的火成岩侵入体和结构要素(主要是断层)。实地工作包括电阻率测深、地磁勘测和全球定位系统测量。地磁结果表明,该地区西部存在一组东西向的主断裂,而北部则存在着一组NW-SW向的主断裂。调查结果还显示,在山谷东部中部存在两个火成岩侵入体。已经确定了基底岩石深度的显着差异,范围在距地表 0 到 900 m 之间。已经发现高水平运动和高剪切应变率都集中在研究区的东南部,并且注意到沿主要观测断层和主要地下水含水层积累了高应力。地电结果证实存在两个含水层;一个向北变窄的浅层含水层(第四纪含水层)和一个被认为是主要含水层的努比亚砂岩含水层。努比亚砂岩含水层携带该地区地下水,其覆盖在以基底复合层为代表的最后一个地电单元和影响研究区地下水潜在可用性的地质结构上,地磁调查和应力积累证明了这一点。

更新日期:2021-08-03
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