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首页> 外文期刊>Estuarine Coastal and Shelf Science >Lagoons of the Nile delta, Egypt, heavy metal sink: With a special reference to the Yangtze estuary of China
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Lagoons of the Nile delta, Egypt, heavy metal sink: With a special reference to the Yangtze estuary of China

机译：埃及尼罗河三角洲的泻湖，重金属水槽：特别提到中国长江口

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摘要

Lagoons of the Nile delta are a vital aquacultural base for millions of people in Egypt. Since the 1960s, when the Aswan High Dam was completed, the estuary has changed from high to low turbidity and this has dramatically altered the eco-hydrological environment. In this study we attempt to explore the spatial and temporal distribution of heavy metals (Al, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn) based on 6 short sediment cores recovered from Manzala, Burullus and Edku lagoons on the Nile delta. Radiometric dating indicates that the upper 10-15 cm of the core sediment is post-Aswan Dam. Manzala on the eastern delta coast is severely polluted by almost all metals analyzed in the present study, especially Mn, Pb, Zn and Cd, due to its connection to the city of Cairo, and the direct human input from neighboring mega-cities, where the petro-chemical industry is thought to be a major source. Although Burullus on the central delta coast has the lowest concentrations of Mn and Pb, there is an increasing trend, implying a linkage to local agricultural sources, and the recently expanding megacities in the central delta plain. Edku on western delta coast seems remote from any major pollution sources, but higher Mn, Pb, and Zn in the upper portion of the lake sediment suggest human influences from Alexandria to the west via the littoral current. The horse-saddle distribution pattern of polluted metals along the Nile coast, as evidenced by the Enrichment Factor (EF), is closely associated with the regulated runoff to the lower delta plain and coast, where extremely low precipitation occurs. This physical setting is certainly prone to concentrating anthropogenic heavy metals in the lagoons. The opposite example is the intensively-cultivated Yangtze estuary in China, where monsoonal precipitation flushes out a huge amount of metals as manifested by the lower EF than that of the Nile.
机译：尼罗河三角洲的泻湖是埃及数百万人的重要水产养殖基地。自1960年代以来，阿斯旺高坝建成后，河口从高浊度变为低浊度，这极大地改变了生态水文环境。在这项研究中，我们试图根据从Manzala，Burullus和Edku泻湖上回收的6个短沉积岩心，探索重金属（Al，Cd，Cr，Cu，Fe，Mn，Ni，Pb和Zn）的时空分布。尼罗河三角洲。放射性测年表明核心沉积物的上部10-15厘米是阿斯旺水坝之后。本研究中分析的几乎所有金属都对东部三角洲海岸的曼萨拉造成了严重污染，特别是锰，铅，锌和镉，因为它与开罗市相连，并且来自邻近大城市的直接人类输入，在那里人们认为石化工业是主要来源。尽管中部三角洲海岸的Burullus的Mn和Pb含量最低，但趋势呈上升趋势，这暗示着与当地农业资源的联系以及中部三角洲平原最近扩张的特大城市。西部三角洲海岸的埃德库（Edku）似乎远离任何主要污染源，但湖泊沉积物上部的锰，铅和锌含量较高，表明人类通过沿海水流从亚历山大到西部。富集因子（EF）证明，尼罗河沿岸污染金属的马鞍分布模式与下游三角洲平原和沿海的受控径流密切相关，那里的降水极少。这种物理环境肯定易于在泻湖中浓缩人为的重金属。相反的例子是中国密集耕种的长江口，季风性降水冲刷出大量金属，其EF值比尼罗河低。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2013年第20期|282-292|共11页
  • 作者

    Jiawei Gu; Alaa Salem; Zhongyuan Chen;

  • 作者单位

    State Key Laboratory of Estuarine and Coastal Research of East China Normal University, Shanghai 200062, China,Department of Geography of Henan Institute of Education, Zhengzhou 450046, China;

    Geological Sciences Department of Kafrelsheikh University, Kafrelsheikh 33516, Egypt,State Key Laboratory of Estuarine and Coastal Research, East China Normal University, North Zhongshan Rd. 3663, Shanghai 200062, China;

    State Key Laboratory of Estuarine and Coastal Research of East China Normal University, Shanghai 200062, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    heavy metal contamination; post-dam sedimentation; lagoons; nile delta; yangtze delta;

    机译：重金属污染;大坝后沉积;泻湖尼罗河三角洲长江三角洲;

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