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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Bedload tracing in a high-sediment-load mountain stream
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Bedload tracing in a high-sediment-load mountain stream

机译：高泥沙山区河流的泥沙追踪

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This paper reports a radiofrequency identification (RFID) tracing experiment implemented in a high-sediment-load mountain stream typical of alpine gravel-bed torrents. The study site is the Bouinenc Torrent, a tributary to the Bléone River in southeast France that drains a 38·9-km~2 degraded catchment. In spring 2008, we deployed 451 tracers with b-axis ranging from 23 to 520 mm. Tracers were seeded along eight cross-sections located in the upstream part of the lowest 2·3 km of the stream. Three tracer inventories were implemented in July 2008, 2009 and 2010. Recovery rates calculated for mobile tracers declined from 78% in 2008 to 45% in 2009 and 25% in 2010. Observations of tracer displacement revealed very high sediment dispersion, with frontrunners having travelled more than 2 km only three months after their deployment. The declining recovery rate over time was interpreted as resulting from rapid dispersion rather than deep burial. We evaluated that 64% of the tracers deployed in the active channel were exported from the 2·3-km study reach three years after the onset of the tracing experiment. Travel distances were characterized by right-skewed and heavy-tailed distributions, correctly fitted by a power-law function. This supports the idea that in gravel-bed rivers with abundant sediment supply relative to transport capacity, bedload transport can be viewed as a superdiffusive sediment dispersion process. It is also shown that tracers initially deployed in the low-flow channel were characterized by a 15- to 30-fold increase of mobility compared to tracers deployed in gravel bars.
机译：本文报告了在典型的高山砾石床山洪的高沉积物负荷山区河流中实施的射频识别（RFID）追踪实验。研究地点是法国东南部布莱恩河（BléoneRiver）的支流布因南特洪流（Bouinenc Torrent），排水量为38·9km〜2。在2008年春季，我们部署了451个示踪仪，其b轴范围从23到520 mm。示踪剂沿着位于最低2·3 km流上游的八个横截面播种。在2008年7月，2009年和2010年实施了3种示踪剂清单。计算出的示踪剂回收率从2008年的78％下降到2009年的45％和2010年的25％。示踪剂位移的观察结果表明泥沙分散度非常高，领先者曾到过部署仅三个月后超过2公里。随着时间的流逝，回收率下降的原因是快速分散而不是深埋。我们评估了在跟踪实验开始三年后的2·3 km研究中，部署在活动通道中的示踪剂中有64％是出口的。行进距离的特征是右偏斜和重尾分布，并通过幂律函数正确拟合。这支持了这样的观点，即在相对于运输能力而言，泥沙供应量丰富的砾石河道中，河床输沙可以看作是一种超扩散性的泥沙扩散过程。还显示出，最初部署在低流量通道中的示踪剂的特征是，与部署在砾石条中的示踪剂相比，迁移率提高了15到30倍。

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