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Impacts of Seawater Rise on Seawater Intrusion in the Nile Delta Aquifer, Egypt

机译：埃及尼罗河三角洲含水层中海水上升对海水入侵的影响

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Several investigations have recently considered the possible impacts of climate change and seawater level rise on seawater intrusion in coastal aquifers. All have revealed the severity of the problem and the significance of the landward movement of the dispersion zone under the condition of seawater level rise. Most of the studies did not consider the possible effects of the seawater rise on the inland movement of the shoreline and the associate changes in the boundary conditions at the seaside and the domain geometry. Such effects become more evident in flat, low land, coastal alluvial plans where large areas might be submerged with seawater under a relatively small increase in the seawater level. None of the studies combined the effect of increased groundwater pumping, due to the possible decline in precipitation and shortage in surface water resources, with the expected landward shift of the shore line. In this article, the possible effects of seawater level rise in the Mediterranean Sea on the seawater intrusion problem in the Nile Delta Aquifer are investigated using FEFLOW. The simulations are conducted in horizontal view while considering the effect of the shoreline landward shift using digital elevation models. In addition to the basic run (current conditions), six different scenarios are considered. Scenarios one, two, and three assume a 0.5 m seawater rise while the total pumping is reduced by 50%, maintained as per the current conditions and doubled, respectively. Scenarios four, five, and six assume a 1.0 m seawater rise and the total pumping is changed as in the first three scenarios. The shoreline is moved to account for the seawater rise and hence the study domain and the seaside boundary are modified accordingly. It is concluded that, large areas in the coastal zone of the Nile Delta will be submerged by seawater and the coast line will shift landward by several kilometers in the eastern and western sides of the Delta. Scenario six represents the worst case under which the volume of freshwater will be reduced to about 513 km~3 (billion m~3).
机译：最近的一些调查考虑了气候变化和海水水平上升对沿海含水层中海水入侵的可能影响。所有这些都揭示了问题的严重性，以及在海水水位上升的情况下分散区向内移动的重要性。大多数研究都没有考虑到海水上升对海岸线向内陆移动的可能影响，以及在海边边界条件和区域几何形状方面的相关变化。这种影响在平坦，低地，沿海冲积计划中变得更加明显，在这些计划中，大范围地区可能会被海水淹没，而海水水位的增加相对较小。由于降水量的减少和地表水资源的短缺，以及预计的海岸线向岸移动，没有一项研究将增加地下水泵送的影响结合在一起。在本文中，使用FEFLOW研究了地​​中海海水位上升对尼罗河三角洲含水层中海水入侵问题的可能影响。该模拟是在水平视图中进行的，同时考虑了使用数字高程模型的海岸线向岸移动的影响。除了基本运行（当前条件）外，还考虑了六个不同的方案。方案一，方案二和方案三假设海水上升量为0.5 m，而总抽水量减少了50％（根据当前条件保持不变，分别增加一倍）。情景4，情景5和情景6假设海水上升了1.0 m，并且总抽水量发生了变化，就像前三种情景一样。海岸线的移动是考虑到海水上升的原因，因此研究范围和海边边界也作了相应的修改。结论是，尼罗河三角洲沿海地区的大片区域将被海水淹没，海岸线将在三角洲的东西两侧向陆地移动数公里。方案六是最坏的情况，在这种情况下，淡水量将减少到约513 km〜3（十亿m〜3）。

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  • 来源
    《Ground water》 |2014年第2期|264-276|共13页
  • 作者

    Ahmed Sefelnasr; Mohsen Sherif;

  • 作者单位

    Geology Department, Faculty of Science, Assuit University,71516 Assuit, Egypt;

    Department of Civil and Environmental Engineering, College of Engineering, United Arab Emirates University, P.O. Box # 15551, Al Ain, United Arab Emirates;

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