A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effects of Submerged Vegetation Density on Turbulent Flow Characteristics in an Open Channel
The vegetation density λ affects turbulent flow type in the submerged vegetated river. This laboratory study investigates different types of vegetated turbulent flow, especially the flow at 0.04 < λ < 0.1 and λ = 1.44 by setting the experimental λ within a large range. Vertical distributions of turbulent statistics (velocity, shear stress and skewness coefficients), turbulence kinetic generation rate and turbulence spectra in different λ conditions have been presented and compared. Results indicate that for flow at 0.04 < λ < 0.1, the profiles of turbulent statistics manifest characteristics that are similar to those of both the bed-shear flow and the free-shear flow, and the turbulence spectral curves are characterized with some slight humps within the low-frequency range. For λ = 1.44, the turbulent statistics above the vegetation top demonstrate the characteristics of boundary-shear flow. The spectral curves fluctuate intensely within the low-frequency range, and the spectra of low-frequency eddies above vegetation top are significantly larger than the values below. The change of turbulent flow type induced by an increase of λ would increase the maximum value of turbulence kinetic generation rate GS and change the point where GS is vertically maximum upwards to the vegetation top.
Effects of Submerged Vegetation Density on Turbulent Flow Characteristics in an Open Channel
The vegetation density λ affects turbulent flow type in the submerged vegetated river. This laboratory study investigates different types of vegetated turbulent flow, especially the flow at 0.04 < λ < 0.1 and λ = 1.44 by setting the experimental λ within a large range. Vertical distributions of turbulent statistics (velocity, shear stress and skewness coefficients), turbulence kinetic generation rate and turbulence spectra in different λ conditions have been presented and compared. Results indicate that for flow at 0.04 < λ < 0.1, the profiles of turbulent statistics manifest characteristics that are similar to those of both the bed-shear flow and the free-shear flow, and the turbulence spectral curves are characterized with some slight humps within the low-frequency range. For λ = 1.44, the turbulent statistics above the vegetation top demonstrate the characteristics of boundary-shear flow. The spectral curves fluctuate intensely within the low-frequency range, and the spectra of low-frequency eddies above vegetation top are significantly larger than the values below. The change of turbulent flow type induced by an increase of λ would increase the maximum value of turbulence kinetic generation rate GS and change the point where GS is vertically maximum upwards to the vegetation top.
Effects of Submerged Vegetation Density on Turbulent Flow Characteristics in an Open Channel
Hanqing Zhao (author) / Jing Yan (author) / Saiyu Yuan (author) / Jiefu Liu (author) / Jinyu Zheng (author)
2019
Article (Journal)
Electronic Resource
Unknown
Metadata by DOAJ is licensed under CC BY-SA 1.0
TURBULENT FLOW IN OPEN CHANNELS WITH SUBMERGED VEGETATION
| British Library Conference Proceedings | 2007
Large eddy simulation of free surface turbulent flow in open channel with submerged vegetation
| British Library Conference Proceedings | 2002
Turbulent characteristics in open-channel flow with emergent and submerged macrophytes
| British Library Online Contents | 2010
LATERAL INHOMOGENEITY OF OPEN-CHANNEL FLOW OVER SUBMERGED VEGETATION
| British Library Conference Proceedings | 2007
Turbulent Open-Channel Flow Through Simulated Vegetation
| British Library Conference Proceedings | 1995