Coupling channel evolution monitoring and RFID tracking in a large, wandering, gravel-bed river: Insights into sediment routing on geomorphic continuity through a riffle–pool sequence
Coupling channel evolution monitoring and RFID tracking in a large, wandering, gravel-bed river: Insights into sediment routing on geomorphic continuity through a riffle–pool sequence
复制标题
将河道演变监测与 RFID 跟踪结合起来，在一条大型、漂流的砾石河床河流中：通过浅滩-池序列深入了解沉积物演进对地貌连续性的影响
DOI：
10.1016/j.geomorph.2014.12.013
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发表时间：
2015
期刊：
影响因子：
3.9
通讯作者：
M. D. Linares
中科院分区：
文献类型：
--
作者：
M. Chapuis;S. Dufour;M. Provansal;B. Couvert;M. D. Linares
大型砾石河床河流中的底质输送和河床流动性不易监测，特别是在洪水期间。在进行流量测量时，较大的范围会导致在流动过程中进入床层变得困难。由于这些后勤问题，目前有关底质运输过程和河床流动性的知识缺乏实地信息，而这种缺失的信息恰好符合河流管理需求。在漂移区域中，缺乏将通道演化和粒子位移联系起来的信息更为引人注目。杜兰斯河是一条大型流动砾石河床河流（流域面积：14,280 km2；平均宽度：240 m），位于法国阿尔卑斯山南部，深受分流和砾石开采影响。为了提高目前对沉积物输送过程与河床形态动力学之间联系的认识，我们利用射频识别 (RFID) 跟踪和地形测量（GPS RTK 和冲刷链）对河道中的沉积物颗粒调查进行了为期 4 年的洪水间隔调查。通过结合洪水前后的地形变化、冲刷链的洪水内侵蚀/沉积模式、示踪颗粒的差异路径以及复杂河段的河床剪应力的空间分布，本文旨在定义该环境中沉积物显着流动性的临界剪应力。砾石追踪突出显示了与这次洪水事件中颗粒物下游迁移和穿过浅滩的传输相一致的位移模式。由于洪水期间无法测量速度，Telemac 三维模型通过估计峰值流量时剪切应力和流动方向的空间分布来帮助解释颗粒位移。尽管在大型、流动的砾石河床中进行 RFID 跟踪确实存在一些技术限制（掩埋、恢复过程耗时），但它提供了有关沉积物通过浅滩-池序列的路线的有用信息。
Bedload transport and bedform mobility in large gravel-bed rivers are not easily monitored, especially during floods. Large reaches present difficulties in bed access during flows for flow measurements. Because of these logistical issues, the current knowledge about bedload transport processes and bedform mobility lacks field-based information, while this missing information would precisely match river management needs. The lack of information linking channel evolution and particle displacements is even more striking in wandering reaches. The Durance River is a large, wandering, gravel-bed river (catchment area: 14,280 km2; mean width: 240 m), located in the southern French Alps and highly impacted by flow diversion and gravel mining. In order to improve current understanding of the link between sediment transport processes and river bed morphodynamics, we set up a sediment particle survey in the channel using Radio Frequency Identification (RFID) tracking and topographic surveys (GPS RTK and scour chains) for a 4-year recurrence interval flood. By combining topographic changes before and after a flood, intraflood erosion/deposition patterns from scour chains, differential routing of tracer particles, and spatial distribution of bed shear stress through a complex reach, this paper aims to define the critical shear stress for significant sediment mobility in this setting. Gravel tracking highlights displacement patterns in agreement with bar downstream migration and transport of particles across the riffle within this single flood event. Because no velocity measurements were possible during flood, aTelemacthree-dimensional model helped interpret particle displacements by estimating spatial distribution of shear stresses and flow directions at peak flow. Although RFID tracking in a large, wandering, gravel-bed river does have some technical limitations (burial, recovery process time-consuming), it provides useful information on sediment routing through a riffle–pool sequence.