scholarly journals Turbulent Flow Structure in a Confluence: Influence of Tributaries Width and Discharge Ratios

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 465
Author(s):  
Leila Alizadeh ◽  
João Fernandes
Keyword(s):  
Turbulent Flow ◽  
Shear Layer ◽  
Flow Structure ◽  
Transport Processes ◽  
Momentum Ratio ◽  
Experimental Campaign ◽  
Flow Mechanisms ◽  
Turbulent Flow Structure ◽  
Physical Mixing ◽  
The Difference

River channel confluences are rather important interfaces where intense changes in physical, mixing and sediment transport processes occur. Following an experimental campaign, the main flow mechanisms in confluences and the development of the shear layer formed between the two tributary flows are presented. As the experimental flow cases comprised changes in the flow discharge and channel widths of the tributaries, the influence of width and discharge ratios on the turbulent flow structure and shear layer is also evaluated. Main findings indicate that changes in the difference between momentum ratio in the tributaries have a significant effect on the magnitude and location of flow mechanisms.

scholarly journals Turbulent flow structure at a 90-degree open channel confluence: Accounting for the distortion of the shear layer

2016 ◽  
Vol 12 ◽  
pp. 130-147 ◽  
Author(s):  
Saiyu Yuan ◽  
Hongwu Tang ◽  
Yang Xiao ◽  
Xuehan Qiu ◽  
Huiming Zhang ◽  
...  
Keyword(s):  
Turbulent Flow ◽  
Shear Layer ◽  
Flow Structure ◽  
Open Channel ◽  
Turbulent Flow Structure ◽  
Channel Confluence

scholarly journals Turbulent Flow Structure of Separated Shear Layer in Stepped Open Channel

2001 ◽  
Vol 4 ◽  
pp. 541-548
Author(s):  
Terunmori OHMOTO ◽  
Norimitsu NARIAI ◽  
Kouichi YAKITA
Keyword(s):  
Turbulent Flow ◽  
Shear Layer ◽  
Flow Structure ◽  
Open Channel ◽  
Separated Shear Layer ◽  
Turbulent Flow Structure

Turbulent flow structure at a discordant river confluence: Asymmetric jet dynamics with implications for channel morphology

2017 ◽  
Vol 122 (6) ◽  
pp. 1278-1293 ◽  
Author(s):  
Alexander N. Sukhodolov ◽  
Julian Krick ◽  
Tatiana A. Sukhodolova ◽  
Zhengyang Cheng ◽  
Bruce L. Rhoads ◽  
...  
Keyword(s):  
Turbulent Flow ◽  
Flow Structure ◽  
Channel Morphology ◽  
River Confluence ◽  
Turbulent Flow Structure

Turbulent characteristics of flow in the vicinity of mid-channel braid bar

2020 ◽  
Author(s):  
Mohammad Amir Khan ◽  
Nayan Sharma ◽  
MANISH PANDEY ◽  
Mohd Obaid Qamar
Keyword(s):  
Turbulent Flow ◽  
Flow Structure ◽  
Turbulent Intensity ◽  
Flow Area ◽  
Fluvial Processes ◽  
Relative Dominance ◽  
Turbulent Characteristics ◽  
Turbulent Flow Structure ◽  
The Impact ◽  
Channel Bar

The impact of a mid-channel bar on the turbulent flow structure has been investigated in this research. A new Dominance Function S_(i,H) is proposed in this study as a measure of the relative dominance of ejection and sweep events in turbulent flow structure. Occurrence of the kolk-boil phenomenon is observed due to interaction of ejection and sweep events.. A new parameter Movement Ratio is formulated in this study which is found to faithfully reflect the fluvial processes of sedimentation and scouring on the channel bed.. Acceleration of flow is seen to occur at adjoining regions close to the upstream end of the bar. Due to the presence of the bar, the flow area in its proximity decreases which has caused increment in the velocity at sections located near the upstream end of the mid-channel bar. For model runs with bars, a distinct bulge in the turbulent intensity graph is observed.

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