Traveling or Jiggling: Particle Motion Modes and Their Relative Contribution to Bed-Load Variables

IF 3.5 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Journal of Geophysical Research: Earth Surface Pub Date : 2024-08-03 DOI:10.1029/2024JF007637
Daniel Rebai, Alessio Radice, Francesco Ballio
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Abstract

The motion state of a particle is a crucial aspect of sediment transport problems. In this paper, we conceptualized three states: stillness, “transport”, and “non-transport”, considering that not all the particle motions contribute significantly to the mean sediment transport rate. Starting from a data set of bed-load particle tracks obtained from particle tracking velocimetry, we removed the bias from experimental uncertainty and applied one-dimensional, instantaneous, and non-parametric criteria for distinguishing the states. We described the kinematics of particles in transport and non-transport states, presenting some sample trajectories and the distributions of particle velocity and acceleration. While the transport state presents a clear distinction between stream-wise and transverse particle velocity, the non-transport state is related to isotropic particle jiggling, and does not significantly contribute to the bed-load rate. Vice-versa, the particle motions in the non-transport state are relevant for other summary indicators of the transport process, such as the mean number of moving particles and mean particle velocity. We discuss how applying the proposed non-parametric criterion for state separation is beneficial compared to parameter-dependent alternatives available in the literature. Finally, we provide an outlook on possible applications of our concept for the investigation of other sediment transport processes (incipient motion, solid-fluid interface, creeping flow).

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行进还是抖动:粒子运动模式及其对床载荷变量的相对贡献
颗粒的运动状态是泥沙输运问题的一个关键方面。考虑到并非所有颗粒运动都会对平均沉积物输运率产生重大影响,我们在本文中提出了三种状态的概念:静止、"输运 "和 "非输运"。我们从粒子跟踪测速仪获得的床面负荷粒子轨迹数据集出发,消除了实验不确定性带来的偏差,并采用一维、瞬时和非参数标准来区分这些状态。我们描述了颗粒在传输状态和非传输状态下的运动学特性,展示了一些样本轨迹以及颗粒速度和加速度的分布。运移状态下的粒子速度与横向粒子速度有明显区别,而非运移状态则与各向同性的粒子抖动有关,对床面负荷率的影响不大。反之亦然,非迁移状态下的颗粒运动与迁移过程的其他简要指标有关,如移动颗粒的平均数量和平均颗粒速度。我们讨论了与文献中依赖参数的替代方法相比,采用所提出的非参数标准进行状态分离的好处。最后,我们展望了将我们的概念应用于研究其他沉积物输运过程(初生运动、固液界面、蠕动流)的可能性。
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来源期刊
Journal of Geophysical Research: Earth Surface
Journal of Geophysical Research: Earth Surface Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
6.30
自引率
10.30%
发文量
162
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