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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Particle transport in gravel-bed rivers: Revisiting passive tracer data
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Particle transport in gravel-bed rivers: Revisiting passive tracer data

机译：碎石河河中的粒子运输：重新审视被动示踪数据

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摘要

Data from tracer experiments were compiled and analysed in order to explore the role of geomorphological, hydrological and sedimentological constraints on fluvial gravel transport in gravel-bed rivers. A large data set from 217 transport episodes of tagged stones were compiled from 33 scientific papers. Our analyses showed that while magnitude of peak discharge is a major control on gravel transport and mobility, tracer travel distances show some scale dependence on the morphological configuration of the channel. Our results also highlight differences in the way tracers are displaced between step-pool and riffle and pool channels. The riffle-pool sequence seems to be a more efficient trap for travelling gravels than the step-pool pair. In addition, in step-pool channels there are clear differences in tracer transport between observations of first displacements after tracer seeding (unconstrained-stone conditions), and second and subsequent observations of tracer displacements (constrained-stone conditions). The comparison between tracer experiments under constrained conditions and those under unconstrained conditions also highlights the importance of bed state and structures in gravel mobility. The results of this study confirm that sediment transport in gravel-bed rivers is a complex process, whereby sedimentological and geomorphological controls are superimposed on the hydraulic forcing. (c) 2018 John Wiley & Sons, Ltd.
机译：编制和分析了示踪剂实验的数据，以探讨砾石床河流河流砾石运输的地貌，水文和沉积物结构的作用。从217个标记的石头的传输剧集组成的大型数据被编制于33个科学论文。我们的分析表明，虽然峰值放电的幅度是砾石运输和移动性的主要控制，但是示踪剂行程距离显示出一些比例依赖于通道的形态配置。我们的结果还突出了跟踪器在步进池和Riffle和池渠道之间移位的方式差异。 Riffle-Pool序列似乎是用于踏板的陷阱而不是阶梯池对。另外，在阶梯池通道中，在示踪剂播种机（不受约束 - 石条件）之后的第一位移观察之间存在明显的差异，以及跟踪位移的第二和后续观察（约束 - 石材条件）。在约束条件下的示踪剂实验与无约束条件下的比较也强调了床位和结构在砾石移动中的重要性。本研究的结果证实，砾石床河流中的沉积物运输是一个复杂的过程，从而叠加在液压强制上的沉积学和地貌控制。 （c）2018 John Wiley＆Sons，Ltd。

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