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GIS-based evaluation and statistical determination of groundwater geochemistry for potential irrigation use in El Moghra, Egypt
Environmental Monitoring and Assessment ( IF 2.9 ) Pub Date : 2021-04-27 , DOI: 10.1007/s10661-021-09058-2
Mohamed Galal Eltarabily , Hossam Eldin M. Moghazy

The El Moghra area is located in northwestern Egypt in the Western Desert. It is classified as the first priority of the national project to reclaim 1.50 million feddan of Egypt’s desert lands. Groundwater quality assessment of the El Moghra aquifer is essential because irrigation water requirements in the El Moghra area depend solely on groundwater. A geochemistry analysis was conducted for 230,000 feddans from forty-six groundwater samples collected during the drilling process of deep wells in year 2018 and 2019. Our study’s main objective is to determine whether the groundwater in the El Moghra aquifer is suitable for irrigation use. ArcGIS was used to prepare the geospatial distribution maps of major elements. Hydrochemical characteristics and groundwater types were identified from descriptive analyses of groundwater samples. Multivariate statistical analysis was run using SPSS; correlation coefficients were first determined; then, a correlation matrix was generated. Principal component analysis was performed and a covariance matrix with varimax rotation was produced. Results revealed the alkalinity and the high salinity of groundwater in the project study area. Most of the samples had a total hardness greater than 300 mg/l. Sodium chloride (Na–Cl) is the dominant type for groundwater samples. The mechanism controlling groundwater chemistry depends on rock weathering. Principal component analysis results showed that two eigenvectors among ten have a 72.86% contribution to the cumulative variance. The higher TDS values (14,008 mg/l) confirm the ions release when the upward groundwater flow from the lower Nubian Sandstone aquifer system to the upper quaternary aquifer occurs. Additionally, the geospatial maps of ion distribution showed that the frequent release of minerals happens in the northwestern part of the project study area: the eastern Qattara Depression. A perfect correlation between sodium and chloride distributions was obtained, and it is identical to the electrical conductivity distribution as well. Our study recommends very salt-tolerant crops as canola, barley, quinoa, and jojoba to be planted in the project area. Drought-tolerant crops as Barbary fig and Jatropha are also recommended. Applying irrigation water frequently with short intervals between irrigations to avoid soil drying and surface clusters’ formation, as well as enhance leeching of salts away from the root systems, is essential.



中文翻译:

基于GIS的埃及El Moghra潜在灌溉用水的地下水地球化学评估和统计确定

El Moghra地区位于埃及西北部的西部沙漠中。它被列为国家工程的重中之重,该工程要求收回埃及沙漠土地的150万名联邦苏丹。El Moghra含水层的地下水质量评估至关重要,因为El Moghra地区的灌溉水需求完全取决于地下水。从2018年和2019年深井钻井过程中收集的46份地下水样品中,对23万联邦调查人员进行了地球化学分析。我们的主要目标是确定El Moghra含水层中的地下水是否适合灌溉。使用ArcGIS来准备主要元素的地理空间分布图。通过对地下水样品进行描述性分析,确定了水化学特征和地下水类型。使用SPSS进行多变量统计分析;首先确定相关系数;然后,生成一个相关矩阵。进行了主成分分析,并产生了具有varimax旋转的协方差矩阵。结果显示了项目研究区地下水的碱度和高盐度。大多数样品的总硬度大于300 mg / l。氯化钠(Na–Cl)是地下水样品的主要类型。控制地下水化学作用的机制取决于岩石的风化作用。主成分分析结果表明,十个特征向量中的两个特征向量对累积方差的贡献为72.86%。TDS值较高(14,008 mg / l)确认当从下部努比亚砂岩含水层系统到上部第四纪含水层的向上地下水流发生时,离子释放。此外,离子分布的地理空间图表明,矿物质的频繁释放发生在项目研究区域的西北部:东部卡塔拉De陷。获得了钠和氯分布之间的完美相关性,它也与电导率分布相同。我们的研究建议在项目区种植耐盐性很强的农作物,例如油菜,大麦,藜麦和霍霍巴。还推荐使用耐旱作物,如巴巴里无花果和麻风树。每次灌溉之间要间隔很短的时间间隔频繁施用灌溉水,以避免土壤干燥和地表团簇的形成,

更新日期:2021-04-28
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