Several researchers have studied turbulent structures, such as ejections, sweeps, and outwards and inwards interactions in flumes, where the streamwise velocity dominates over vertical and transversal velocities. However, this research presents an experimental study in which there are ejections associated with the interchange between surface and subsurface water, where the vertical velocity dominates over the streamwise component. The experiment is related to a surface alluvial stream that is polluted with fine sediment, which is percolated into the bed. The subsurface flow is modified by a lower permeability associated with the fine sediment and emerges to the surface current. Quasi-steady ejections are produced that drag fine sediment into the surface flow. Particle image velocimetry (PIV) measured the velocity field before and after the ejection. The velocity data were analyzed by scatter plots, power spectra, and wavelet analysis of turbulent fluctuations, finding changes in the distribution of turbulence interactions with and without the presence of fine deposits. The flow sediment ejection changes the patterns of turbulent structures and the distribution of the turbulence interactions that have been reported in open channels without subsurface flows.

中文翻译：

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流动-沉积物湍流喷射：被细沉积物污染的砾石床中地表和地下流之间的相互作用

几位研究人员研究了湍流结构，例如喷射、扫掠以及水槽中的向外和向内相互作用，其中流向速度支配垂直和横向速度。然而，这项研究提出了一项实验研究，其中存在与地表水和地下水之间的交换相关的喷射，其中垂直速度在流向分量上占主导地位。该实验涉及被细小的沉积物污染的地表冲积流，该冲积流渗入床中。地下流被与细粒沉积物相关的较低渗透率所改变，并出现在地表流中。产生准稳态喷射，将细小的沉积物拖入地表流。粒子图像测速 (PIV) 测量了喷射前后的速度场。速度数据通过散点图、功率谱和湍流波动的小波分析进行分析，发现存在和不存在细粒沉积物时湍流相互作用分布的变化。流动沉积物喷射改变了湍流结构的模式和湍流相互作用的分布，这些分布在没有地下流动的明渠中已有报道。