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Sedimentation processes in silt-rich sediment systems

机译：富泥沙沉积系统中的沉积过程

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摘要

Sediment found in China’s Yangtze and Yellow River systems is characterized by large silt fractions. In contrast to sand and clay, sedimentation and erosion behaviour of silt and silt–clay–sand mixtures is relatively unknown. Therefore, settling and consolidation behaviour of silt-rich sediment from these river systems is analysed under laboratory conditions in specially designed settling columns. Results show that a transition in consolidation behaviour occurs around clay contents of about 10 %, which is in analogy with the transition from non-cohesive to cohesive erosion behaviour. Above this threshold, sediment mixtures consolidate in a cohesive way, whereas for smaller clay percentages only weak cohesive behaviour occurs. The settling behaviour of silt-rich sediment is found to be in analogy with granular material at concentration below 150 g/l. Above 150–200 g/l, the material settles in a hindered settling regime where segregation is limited or even prevented. The results indicate that for modelling purposes, multiple sediment fractions need to be assessed in order to produce accurate modelling results.
机译：在中国的长江和黄河水系中发现的沉积物的特征是泥沙含量大。与沙子和粘土相反，粉砂和粉砂-粘土-砂混合物的沉积和侵蚀行为是相对未知的。因此，在实验室条件下，在专门设计的沉降柱中分析了来自这些河流系统的富沙沉积物的沉降和固结行为。结果表明，固结行为的转变发生在大约10％的粘土含量附近，这与从非粘性侵蚀行为向粘性侵蚀行为的转变类似。高于该阈值，沉积物混合物以粘结方式固结，而对于较小的粘土百分比，仅会发生弱的粘结行为。发现富含淤泥的沉积物的沉降行为与浓度低于150 g / l的颗粒状物质相似。高于150-200克/升时，物料会在受阻的沉降状态下沉降，在此情况下隔离会受到限制甚至被阻止。结果表明，出于建模目的，需要评估多个沉积物部分，以产生准确的建模结果。

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