Bed particles were tracked using passive integrated transponder tags in a wandering reach of the San Juan River, British Columbia, Canada, to assess particle movement around three major bars in the river. In‐channel topographic changes were monitored through repeat LiDAR surveys during this period and used in concert with the tracer data set to assess the relationship between particle displacements and changes in channel morphology, specifically, the development and re‐working of bars. This has direct implications for virtual velocity and morphologic based estimates of bedload flux, which rely on accurate estimates of the variability and magnitude of particle path lengths over time. Tracers were deployed in the river at three separate locations in the Fall of 2015, 2016, 2017, and 2018, with recovery surveys conducted during the summer low‐flow season the year after tracer deployment and multiple mobilizing events. Tracers exhibited path length distributions reflective of both morphologic controls and year to year differences related to the annual flow regime. Annual tracer transport was restricted primarily to less than one riffle‐pool‐bar unit, even during years with a greater number of peak floods and duration of competent flow. Tracer deposition and burial was focused along bar margins, particularly at or downstream of the bar apex, reflecting the downstream migration and lateral bar accretion observed on Digital Elevation Models of difference. This highlights the fundamental importance of bar development and re‐working underpinning bedload transport processes in bar‐dominated channels.

中文翻译：

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流浪砾石床中的河床颗粒位移和形态发展

在加拿大不列颠哥伦比亚省圣胡安河四处游荡的河段中，使用无源集成应答器标签跟踪了床颗粒，以评估河中三个主要条形物周围的颗粒运动。在此期间，通过重复的LiDAR调查监测通道内地形变化，并将其与示踪剂数据集一起用于评估颗粒位移与通道形态变化之间的关系，特别是钢筋的开发和返工。这直接影响了基于虚拟速度和基于形态的床荷通量估计，这取决于粒子路径长度随时间变化和大小的准确估计。在2015年，2016年，2017年和2018年秋季，示踪剂被部署在河中三个不同的位置，在部署示踪剂和多次动员事件后的第二年夏季低流量季节进行了恢复调查。示踪剂显示出路径长度分布，既反映了形态学控制又反映了与年度流量模式有关的逐年差异。年度示踪剂运输主要被限制在少于一个浅滩池栏单位，即使在洪峰高峰和有效流量持续时间较长的年份也是如此。示踪剂的沉积和埋藏集中在条带的边缘，特别是在条尖或条尖的下游，反映了在数字高程模型中观察到的向下游的迁移和条带的横向堆积。这突出了棒材开发和返工的根本重要性，这是棒材主导渠道中床载运输过程的基础。