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Flow turbulence presented by different vegetation spacing sizes within a submerged vegetation patch

Journal of Hydrodynamics 2023年第6期35卷 1131-1145页

作者： Chukwuemeka Kingsley John Jaan H.Pu Yakun Guo Prashanth R.Hanmaiahgari Manish Pandey Faculty of Engineering and Informatics University of BradfordBradfordUK Department of Civil Engineering Indian Institute of TechnologyKharagpurIndia National Institute of Technology(NIT) WarangalIndia

This study presents results from a vegetation-induced flow experimental study which investigates 3-D turbulence structure profiles,including Reynolds stress,turbulence intensity and bursting analysis of open channel *** vegetation densities have been built between the adjacent vegetations,and the flow measurements are taken using acoustic Doppler velocimeter(ADV)at the locations within and downstream of the vegetation *** different tests are conducted,where the first test has compact vegetations,while the second and the third tests have open spaces created by one and two empty vegetation slots within the vegetated *** reveals that over 10%of eddies size is generated within the vegetated zone of compact vegetations as compared with the fewer *** turbulence structures variation is also observed at the points in the non-vegetated *** findings from burst-cycle analysis show that the sweep and outward interaction events are dominant,where they further increase away from the *** effect of vegetation on the turbulent burst cycle is mostly obvious up to approximately two-third of vegetation height where this phenomenon is also observed for most other turbulent structure.

关键词： Velocity profiles acoustic Doppler velocimeter(ADV) turbulent intensities Reynolds stress turbulent bursting vegetated flow vegetation spacing sizes

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SUSPENDED SEDIMENT TRANSPORT CAPACITY OF OPEN CHANNEL FLOW

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International Journal of Sediment Research 1997年第3期 1-10页

作者： Zhixian Cao Prot. Dr.-Ing.. Director of Institute of Hydraulic Engineering, Tianjin University. Tianjin 300072. China. Wensheng WangSenior Engineer, Associate Director of Lower Haihe River Administration Bureau. Ministry of Water Resources. Tianjin 300061

A turbulent bursting-based formulation for suspended sediment transport capacity is verified with data from Brownlie (1981). Previous formulations are examined using the results of data analysis. Satisfactory performance of the turbulent bursting-based formulation is demonstrated, in addition to its strong physical background. Einstein’s formula is found to over-or under-estimate sediment transport capacity in some cases. Celik and Rodi’s correlation is shown to behave poorly. The WUHEE curve does not fit the measured data well. Further, the transport capacity is exhibited to increase nonlinearly with the nondimensional quantity u3 /ghw. This behavior upsets many existing formulas, in which the transport capacity is represented as linear functions of U3 /ghw. It is suggested that existing formulations be used cautiously, and more wellgrounded developments based on turbulent bursting be pursued.

关键词： sediment transport capacity sediment entrainment near-bed sediment concentration turbulent bursting sediment transport open channel flow

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