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Consolidation of sediments discharged from the Yellow River: implications for sediment erodibility

机译：黄河排放的泥沙合并：对泥沙侵蚀的影响

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摘要

Consolidation processes acting on an intertidal mudflat in the Yellow River delta, China, were investigated using field and laboratory experiments. The dissipation of excess pore pressure was examined in an excavated experimental plot to characterise the short-term consolidation of sediments discharged from the Yellow River. Changes in sediment strength were monitored over a 5-year period, together with measurements of physical and mechanical properties using laboratory experiments. In addition, the erodibility of silty sediments under wave loading conditions was also tested in the field. Results showed that sediments discharged from the Yellow River experienced a high rate of consolidation after initial deposition. Excess pore pressure dissipated completely after approximately 45 to 51 h. Sediments were then in a state of quasi-overconsolidation and showed heterogeneity in strength. Hydrodynamic action appears to be crucial to sediment consolidation in the primary period and plays a decisive role in the development of a stiff stratum. Changes in sediment strength due to wave-induced secondary modifications over varying temporal and spatial scales are consistent with variations in sediment erodibility. This factor should be considered in the development of erosion models for intertidal mudflat sediments.
机译：利用田间和实验室试验研究了在中国黄河三角洲潮间带滩涂的固结过程。在一个开挖的试验区检查了多余孔隙压力的消散，以表征从黄河排放的沉积物的短期固结。在5年的时间内监测沉积物强度的变化，并使用实验室实验测量物理和机械性能。此外，还在野外测试了波浪载荷条件下粉质沉积物的侵蚀性。结果表明，从黄河排放的沉积物在初次沉积后经历了高固结率。大约45至51小时后，多余的孔隙压力完全消失。沉积物然后处于准超固结状态，强度呈异质性。在初期，水动力作用对于泥沙固结至关重要，并且在坚硬地层的发展中起决定性作用。由于波浪引起的时空变化和空间尺度上的二次变质而引起的沉积物强度变化与沉积物可蚀性的变化是一致的。在开发潮间带滩涂沉积物侵蚀模型时应考虑这一因素。

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  • 来源
    《Ocean Dynamics》 |2013年第4期|371-384|共14页
  • 作者

    Xiaolei Liu; Yonggang Jia; Jiewen Zheng; Xiujuan Yang; Hongxian Shan;

  • 作者单位

    Key Laboratory of Marine Environmental Ecology Ministry of Education">(1);

    Key Laboratory of Marine Environmental Ecology Ministry of Education">(1);

    Faculty of Environmental Science Engineering Ocean University of China">(2);

    Key Laboratory of Marine Environmental Ecology Ministry of Education">(1);

    Architecture Engineering Department Wenjing College Yantai University">(3);

    Key Laboratory of Marine Environmental Ecology Ministry of Education">(1);

    Faculty of Environmental Science Engineering Ocean University of China">(2);

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Consolidation; Erodibility; Sediment strength; Hydrodynamics; Intertidal flats; Yellow River delta;

    机译：合并;可蚀性泥沙强度;流体力学潮间带;黄河三角洲;

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