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Geoelectrical analysis for evaluating the groundwater characteristics of wadi El Madamud Area, Southeast Luxor, Egypt
Journal of Taibah University for Science ( IF 3.3 ) Pub Date : 2020-11-02 , DOI: 10.1080/16583655.2020.1838776
Mohamed A. S. Youssef 1
Affiliation  

In this work, the totally 31 Vertical Electric Soundings (VESes) were carried out at wadi El Madamud, Southeastern Luxor city. These are processed and interpreted the forms of geologic models composed of five geoelectric layers of varying resistivities, lithologies, depths and thicknesses. They are surfacial unconsolidated dry silts, sands and gravels, consolidated silts, sandy gravels, sandstone and clay saturated with water, clay with unsaturated sand intercalations and chalky limestone with chert bands. The surficial layer, dry silts, sands and gravels layer (Quaternary) is cropped out on the surface of the whole area with a very small thickness range (0.5-2.2 meter (m.)) and average thickness 1.1 meters. The surficial layer, Unconsolidated wadi deposits composed of silts, sands and gravels which show the highest resistivity range (3073-90,581 Ω.m.) with average value 27,968 Ω.m. throughout the whole study area. The consolidated silt, sandy and gravels is the second geoelectric layer, which has decreasing resistivity values than the first layer. Thickness of the second geoelectric layer ranges from 1–14 meter. The third geoelectric layer is sandstone and clay saturated with groundwater, which has resistivity range from 4 to1887 Ω.m. and average value 234 Ω.m. and thickness range from 18 to 41 meters with average 21.3 meters. The main target is the shallow aquifer which represented in third geoelectric layer. The clay with unsaturated sandstone intercalation is forth geoelectric layer and has resistivity range from 11 to 10,700 Ω.m. and thickness ranges from 44 to 83 m. The last geoelectric layer is the chalky limestone with chert band, having a wide resistivity range (264–37,045 Ω.m.) with non-defined thickness. The thickness and true resistivity maps of the different layers and 2D geoelectric cross sections are generated for the represented layers to delineate their spatial distribution. The aquifer hydraulic characteristics; such as hydraulic conductivity and transmissivity within the salty aquifer, as well as the groundwater quality (salinity) are estimated, utilizing the true resistivity values acquired on the surface through the geoelectric resistivity survey.



中文翻译:

用地电分析法评估埃及卢克索东南部瓦迪艾尔马达木德地区的地下水特征

在这项工作中,在卢克索东南部的瓦迪·马达马德(wadi El Madamud)进行了总共31次垂直电测深(VESes)。这些被处理并解释了由五个具有不同电阻率,岩性,深度和厚度的地电层组成的地质模型的形式。它们是表面不固结的干粉砂,砂和砾石,固结粉砂,砂砾,水饱和的砂岩和粘土,具有不饱和砂层的粘土和带石带的白垩石灰岩。在整个区域的表面上切出了表层,干粉沙,沙砾层(第四纪),其厚度范围很小(0.5-2.2米(米)),平均厚度为1.1米。表层是由粉砂,沙子和砾石组成的松散的瓦迪沉积物,其电阻率范围最高(3073-90,581Ω.m.)的平均值27,968Ω.m. 遍及整个研究领域。固结的粉砂,沙和砾石是第二层地电层,其电阻率值比第一层低。第二个地电层的厚度为1-14米。第三层地电层是被地下水饱和的砂岩和粘土,其电阻率范围为4至1887Ω.m。平均值234Ω.m。厚度范围从18到41米,平均21.3米。主要目标是第三地电层代表的浅层含水层。夹有不饱和砂岩的粘土在地电层的第四层,电阻率范围为11至10,700Ω.m。厚度范围为44至83 m。最后一个地电层是带石带的白垩灰岩,具有宽电阻率范围(264-37,045Ω.m)。),厚度不确定。为代表的层生成不同层的厚度和真实电阻率图以及2D地电横截面,以描绘其空间分布。含水层的水力特性;利用通过地电电阻率调查获得的地表真实电阻率值来估算含盐含水层中的水力传导率和透射率,以及地下水质量(盐度)。

更新日期:2020-11-03
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