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首页> 外文期刊>International Journal of Geosciences >Geophysical Evaluation for Evidence of Recharging the Pleistocene Aquifer at El-Nubariya Area, West Nile Delta, Egypt
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Geophysical Evaluation for Evidence of Recharging the Pleistocene Aquifer at El-Nubariya Area, West Nile Delta, Egypt

机译：埃及西尼罗河三角洲El-Nubariya地区更新世含水层充填证据的地球物理评估

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With ever increasing demands on water resources, Egypt is facing increasing water needs, demanded by a rapidly growing population, by higher standards of living and by an agricultural policys. West Nile Delta represents a new agricultural area where the reclaimed lands are irrigated with groundwater in addition to surface water. The evaluation of groundwater aquifers in West Nile Delta area requires information about the extension, depth and distribution and source of recharging these aquifers. In this work, an integrated study using geoelectric, geomagnetic, hydrogeologic and hydrochemistry investigations has been applied to evaluate groundwater aquifers and to delineate subsurface structures predominant in the basement rocks at El-Nubariya area, West Nile Delta, Egypt. Thirty-five Vertical Electrical Soundings (VES) have been applied to identify the subsurface geoelctric layers predominant in the study area. As well as a detailed land magnetic survey has been carried out along the study area using two automatic proton precession magnetometers with an accuracy of 1 nT. These surveys allowed us to establish the subsurface structures and their relation with the detected aquifers. The geoelectric results are illustrated along seven geoelectric profiles and correlated with the lithologic and hydrogeologic data of drilled wells. The third geoelectric layer represents the water saturated zone (aquifer) with thickness varies from 14 m to 58 m, increasing to east and southeast directions. The hydrchemisty anlysis shows that the salinity of the water aquifer ranges from 600 ppm in the southeast to 3900 ppm in the south. The major dominant dissolved salt is Nacl. In the east and southeast, the water type becomes more NaSO4 which refers to dissolution of gypsum in addition to fertilizers. The magnetic data have been analyzed using horizontal gradient and 3D magnetic modeling along the locations of geolectric profiles. The results indicate that the fault structures are trending in E-W, NW-SE and NE-SW directions. These faults confirm the results obtained from the well geolectric interpretation. These fault structures act as recharging paths from lower brackish to upper fresh water aquifers.
机译：随着对水资源的需求不断增长，埃及正面临着日益增长的水需求，这是人口快速增长，生活水平提高和农业政策所要求的。西尼罗河三角洲代表了一个新的农业地区，在该地区的开垦土地上除了地表水外还灌溉了地下水。对西尼罗河三角洲地区的地下水含水层进行评估需要有关这些含水层的扩展，深度和分布以及补给源的信息。在这项工作中，利用地电，地磁，水文地质和水化学调查进行的综合研究已用于评估地下水含水层并描绘出埃及西尼罗河三角洲El-Nubariya地区基底岩中主要的地下结构。已经应用了35种垂直电测深（VES）来识别研究区域中主要的地下电土层。沿研究区域进行了详细的陆地磁测量，使用了两个自动质子进动磁力计，精度为1 nT。这些调查使我们能够确定地下结构及其与所探测含水层的关系。沿七个地电剖面图说明了地电结果，并将其与钻井的岩性和水文地质数据相关联。第三地电层代表水饱和区（含水层），厚度从14 m到58 m不等，向东和向东南方向增加。水化学分析表明，含水层的盐度范围从东南的600 ppm到南部的3900 ppm。主要的主要溶解盐是Nacl。在东部和东南部，水类型变为更多的NaSO4，这意味着除肥料外还溶解了石膏。沿地电剖面的位置使用水平梯度和3D磁性建模分析了磁性数据。结果表明，断层构造在E-W，NW-SE和NE-SW方向上呈趋势。这些断层证实了从井电解释中获得的结果。这些断层构造充当了从低咸水到高淡水含水层的补给路径。

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