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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Comparing the behaviour of spherical beads and natural grains in bedload mixtures
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Comparing the behaviour of spherical beads and natural grains in bedload mixtures

机译：比较球形珠和天然粒度在床单混合中的行为

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It is common to use idealised materials to study the dynamics of granular transport in fluid flows, but the impact of this choice upon sediment behaviour has not been extensively explored. To tackle this research gap, two experiments were undertaken to explore the influence of a finer grain input to a channelized coarser granular flow driven by a shallow fluid flow. The first set of runs was undertaken using spherical glass beads, and the second set with natural fluvial sediment. The transport system approximates a narrow slice through the bedload at the bottom of a river. In the runs with natural grains, the infiltration of fine sediment into the bed was similar to the spherical glass beads, but with reduced infiltration capacity. We ascribe this behaviour to irregular and variable pore shapes and sizes in the natural material. The behaviour of the bedload in the natural material runs matched that of the bead runs only when the feed contained a high content of fines. When the feed contained a low content of fines the transport of natural grains was more complex, including the emergence of migrating collections of grains. However, the overall changes in bed and water slope due to the finer grain input were comparable in both sets of experiments. We conclude that artificial, idealised materials qualitatively represent sedimentary phenomena, but that quantitative differences in the outcomes must be expected. (c) 2020 John Wiley & Sons, Ltd.
机译：通常使用理想化的材料来研究流体流动粒状输送的动力学，但这种选择对沉积物行为的影响尚未得到广泛探索。为了解决这一研究差距，进行了两次实验，探讨了更细粒输入对由浅流体流动驱动的引导粗粒状流动的影响。第一组运行使用球形玻璃珠，第二组具有天然河流沉积物。运输系统通过河底的床单近似窄切片。在含有天然晶粒的运行中，细沉积物进入床中的渗透与球形玻璃珠子相似，但渗透能力降低。我们将这种行为归类为不规则和可变的孔形状和尺寸在天然材料中。床单在天然材料中的行为仍然在饲料含有高含量的细粒时才能匹配珠子的行为。当饲料含有低含量的细粒时，天然晶粒的运输更复杂，包括迁移谷物收集的出现。然而，由于两组实验中，由于细粒输入导致的床和水坡的整体变化。我们得出结论，人工，理想化的材料质量代表沉积现象，但必须预期结果的定量差异。 （c）2020 John Wiley＆Sons，Ltd。

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