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首页> 外文期刊>Nordic hydrology >Eolian and fluvial sedimentation in the southwestern Sinai Mountains, Egypt: a record of flash floods during the late Pleistocene
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Eolian and fluvial sedimentation in the southwestern Sinai Mountains, Egypt: a record of flash floods during the late Pleistocene

机译：埃及西南西奈山的风尘和河流沉积：更新世晚期山洪暴发的记录

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摘要

Wadis emerging from the southwestern Sinai Mountains (Egypt) westwards to the Gulf of Suez are filled by >40 m thick late Pleistocene sediments, which have been subsequently incised to bedrock after the Last Glacial Maximum (LGM). Sedimentation and erosion resulted from changes in the basin's hydrological conditions caused by climate variations. Sediment characteristics indicate distinct processes ranging from high to low energy flow regimes. Airborne material is important as a sediment source. The fills are associated with alluvial fans at wadi mouths at the mountain fronts. Each alluvial fan is associated and physically correlated with the respective sediment fill in its contributing wadi. The alluvial fans have steep gradients and are only a few kilometers long or wide. The alluvial fans converge as they emerge from the adjacent valleys. According to optically stimulated luminescence dating, the initial sediment has an age of ~45 ka and the sedimentation ends ~19 ka, i.e., happened mainly during marine isotope stage (MIS) 3 and early MIS 2 formation and initial incision sometime during LGM. As the delivery of sediments in such a hyper-arid environment is by extreme floods, this study indicates an interval of intense fluvial activity, probably related to increased frequency of extreme floods in Southern Sinai. This potentially indicates a paleoclimatic change in this hyper-arid environment.
机译：从西南西奈山（埃及）向西延伸到苏伊士湾的Wadis充满了厚度超过40 m的晚更新世沉积物，这些沉积物随后在上次冰期最大值（LGM）之后切入基岩。沉积物和侵蚀是由于气候变化导致流域水文条件发生变化而引起的。泥沙特征表明，从高能流态到低能流态的不同过程。空气传播的物质作为沉积物来源很重要。这些填充物与山前旱谷口的冲积扇相关。每个冲积扇与其贡献的河谷中的相应沉积物填充物相关联并在物理上相关联。冲积扇的坡度很陡，只有几公里长或宽。当冲积扇从相邻的山谷中涌出时，它们会聚在一起。根据光激发发光测年，初始沉积物的年龄为〜45 ka，沉积终点为〜19 ka，即主要发生在LGM期间的海洋同位素阶段（MIS）3和早期MIS 2形成以及初始切口。由于在这种高干旱环境中的沉积物是通过极端洪水来输送的，因此本研究表明了一段强烈的河流活动间隔，这可能与西奈南部极端洪水的发生频率增加有关。这潜在地表明了这种超干旱环境中的古气候变化。

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  • 来源
    《Nordic hydrology》 |2013年第2期|281-299|共19页
  • 作者

    JOrg vSlkel; Matthias Leopold; Juliane Huber; JOrg Grunert; Kerstin HDrkamp; Andrew Murray;

  • 作者单位

    Technische Universitat Munchen,Center of Life and Food Sciences weihenstephan,Chair of Geomorphology and Soil Science,85350 Freising,Germany;

    Technische Universitat Munchen,Center of Life and Food Sciences weihenstephan,Chair of Geomorphology and Soil Science,85350 Freising,Germany;

    Technische Universitat Munchen,Center of Life and Food Sciences weihenstephan,Chair of Geomorphology and Soil Science,85350 Freising,Germany;

    Johannes Gutenberg Universitat Mainz,Institute of Geography,55099 Mainz,Germany;

    Helmholtz Zentrum Munchen,Institute of Radiation Protection,85764 Neuherberg,Germany;

    Ttie Nordic Laboratory of Luminescence Dating,Rise National Laboratory,4000 Roskilde,Denmark;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    alluvial fans; flash floods; late pleistocene climate; mis 3; sinai mountains; wadi fillings;

    机译：冲积扇;洪灾;更新世晚期气候;错误3;西奈山;旱谷馅料;

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