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Probabilistic description of grain resistance from simultaneous flow field and grain motion measurements

机译:同时进行流场和谷物运动测量的谷物阻力的概率描述

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摘要

Experiments were carried out using a mobile gravel bed placed in a tilting flume witha modified particle image velocimetry (PIV) system. Individual grain movements weresurveyed using data from time series of images. Near-bed velocity flow fieldmeasurements were made simultaneously above the same area of the sediment surface byapplying cross-correlation techniques to the collected plan view images. Statistics of grainmotions were collected through a semiautomatic procedure. Significant changes in theflow field were observed in the proximity of the entrained or deposited particles. A strongcorrelation is shown between the changes in the local streamwise and lateral velocityand the movement of the grains. The theory of Grass is revisited and developed based onthe experimental results. The probability distribution of individual grain resistance hasbeen derived from the statistics of the near-bed velocity field and of the entrainment risk.
机译:使用放置在带有改进的粒子图像测速(PIV)系统的倾斜水槽中的移动砾石床进行实验。使用来自图像时间序列的数据调查了各个谷物的运动。通过对收集的平面图图像应用互相关技术,在沉积物表面相同区域的上方同时进行近床速度流场测量。通过半自动程序收集谷物运动的统计数据。在夹带或沉积的颗粒附近观察到流场的显着变化。局部流向和横向速度的变化与晶粒的运动之间显示出很强的相关性。根据实验结果对草理论进行了回顾和发展。从近床速度场和夹带风险的统计数据中得出了各个谷物抵抗力的概率分布。

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