Velocity Distribution and the Moments of Turbulent Flow over a Sand-Gravel Mixture Bed

Sharma, Anurag

doi:10.1134/s0097807822010158

Cited by 2 publications

(2 citation statements)

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“…As shown in Figure 1 the coherent structures corresponding to emerging bars was analyzed for correlating sediment transport to instantaneous bursting events [18][19][20][21][22][23]. In hydrodynamics, the study of the 2D turbulent flow structures in the vicinity of the wall is generally performed by applying the well-known quadrant events analysis [24,25], whilst it is not sufficiently rigorous and satisfactory when analyzing 3D water flows [26][27][28][29].…”

Section: Laboratory Experimentsmentioning

confidence: 99%

“…Among others, McSherry et al [13] and Jalalabadi et al [14] have observed that bursting turbulent events can be effectively coupled to the classical threshold shear stress theory for the prediction of particles entrainment mechanisms [15][16][17]. In recent hydro-geomorphological numerical and experimental research, the study of the coherent structures corresponding to emerging bars was analyzed for correlating sediment transport to instantaneous bursting events [18][19][20][21][22][23]. In hydrodynamics, the study of the 2D turbulent flow structures in the vicinity of the wall is generally performed by applying the well-known quadrant events analysis [24,25], whilst it is not sufficiently rigorous and satisfactory when analyzing 3D water flows [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional Hole Size (3DHS) Approach for Water Flow Turbulence Analysis over Emerging Sand Bars: Flume-Scale Experiments

Khan

Sharma

Lama

et al. 2022

Water

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The many hydrodynamic implications associated with the geomorphological evolution of braided rivers are still not profoundly examined in both experimental and numerical analyses, due to the generation of three-dimensional turbulence structures around sediment bars. In this experimental research, the 3D velocity fields were measured through an acoustic Doppler velocimeter during flume-scale laboratory experimental runs over an emerging sand bar model, to reproduce the hydrodynamic conditions of real braided rivers, and the 3D Turbulent Kinetic Energy (TKE) components were analyzed and discussed here in detail. Given the three-dimensionality of the examined water flow in the proximity of the experimental bar, the statistical analysis of the octagonal bursting events was applied to analyze and discuss the different flume-scale 3D turbulence structures. The main novelty of this study is the proposal of the 3D Hole Size (3DHS) analysis, used for separating the extreme events observed in the experimental runs from the low-intensity events.

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