Controls on local scour and deposition induced by obstacles in fluvial environments
Controls on local scour and deposition induced by obstacles in fluvial environments
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DOI：
10.1016/j.catena.2010.11.002
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发表时间：
2012-04
期刊：
影响因子：
6.2
通讯作者：
T. Euler;J. Herget
中科院分区：
文献类型：
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作者：
T. Euler;J. Herget
河流环境中的障碍物会导致水流分离和三维流场的出现，从而导致冲刷和沉积，即使河床上没有发生一般的沉积物输送。由此产生的形式通常被称为“河流障碍物痕迹”。这些形式的形态和动力学取决于障碍物、流动和沉积物特征。由于目前还没有普遍认可的分析这些形状的方法，因此开发了一种基于过程的方法，将某些依赖的形态测量变量与适应的障碍物雷诺数相关联。该新方法通过在实验室水槽中进行实验来应用，并根据其他实验室和现场数据进行验证。这项工作的结果表明，河流障碍物标记的形态测量与障碍物雷诺数之间存在显着关系，特别是当形态测量变量组合时。该方法的进一步验证、校准和推广将有助于充分评估河流环境中的障碍物对泥沙输运微观和中观过程的影响。
Obstacles in fluvial environments cause flow separation and the emergence of three-dimensional flow fields that can lead to scour and deposition, even when no general sediment transport at the bed occurs. Resulting forms are commonly denoted as ‘fluvial obstacle marks’. The morphology and dynamics of these forms is depended on obstacle-, flow- and sediment characteristics. As no generally approved approach for analysis of these forms exists yet, a process-based method is developed that relates certain dependent morphometric variables to an adapted obstacle Reynolds number. The novel approach was applied by conducting experiments in a laboratory flume and validated against other laboratory and field data. The results of this work have shown a significant relationship between the morphometry of fluvial obstacle marks and obstacle Reynolds number, especially when morphometric variables were combined. Further validation, calibration and extension and of this approach will help to adequately asses the influence of obstacles in the fluvial environment on micro- and meso-scale processes of sediment transport.