Abstract Ground-water samples were collected from 10 wells in Wadi El-Natrun, Western Desert, Egypt, over four consecutive years. The combination of isotopic composition and hydrochemical analyses was used to identify the origin of the groundwater and determine recharging sources as well as to discuss the mechanism controlling hydrochemical variation among wells. Two water sources, a relatively recent/shallow aquifer recharged from Nile River water and a deep/old aquifer (i.e. the Nubian sandstone aquifer system [NSAS]), are identified from isotopic and geographical relationships and the correlation between isotopic data and bicarbonate concentration. It was found that Nile Delta aquifer water was likely supplied as groundwater flows from the southeast and that old water (paleowater) was supplied upward from deeper layers. Some wells show relatively greater variation in concentration as well as in hydrogen isotope composition during the four-year study. Based on the relationship between concentration and isotope composition the variation was not caused by seawater intrusion or salt dissolution but by intensive water loss. The water loss is not directly due to evaporation or suction but is considered to proceed indirectly within the soil.

中文翻译：

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埃及西部沙漠 Wadi El-Natrun 地下水的水化学和同位素研究：对盐渍化过程的影响

摘要 连续四年从埃及西部沙漠Wadi El-Natrun的10口井采集地下水样品。结合同位素组成和水化学分析，确定地下水来源，确定补给源，讨论控制井间水化学变化的机制。根据同位素和地理关系以及同位素数据与碳酸氢盐浓度之间的相关性，确定了两个水源，即从尼罗河水补给的相对较新/浅的含水层和深层/古老的含水层（即努比亚砂岩含水层系统 [NSAS]）。发现尼罗河三角洲含水层水很可能是从东南部流出的地下水提供的，而旧水（古水）则从更深层向上提供。在为期四年的研究中，一些井在浓度和氢同位素组成方面表现出相对较大的变化。根据浓度与同位素组成之间的关系，变化不是由海水入侵或盐溶引起的，而是由强烈的失水引起的。水分流失不是直接由蒸发或吸力造成的，而是被认为是在土壤内间接进行的。