Experiments of Three-Dimensional Flow Structure in Braided Rivers

Hua, Zulin; Gu, Li; Chu, Kejian

doi:10.1016/s1001-6058(08)60140-7

Cited by 15 publications

(4 citation statements)

References 12 publications

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“…The shear layer indicate a high level of turbulence, or a large‐scale coherent structure, which is the main mechanism of the mixing interface in the scenario with no density difference (Rhoads & Sukhodolov, 2008). The separation zone is labeled as region A to the left of the shear layer zone, which is a typical characteristics related to the dynamic process in the mainstream‐tributary confluence found both in laboratory experiments (Hua et al., 2009; Rhoads & Sukhodolov, 2004) and field surveys (Baranya et al., 2010; Konsoer & Rhoads, 2013; Rhoads & Sukhodolov, 2004; Weerakoon et al., 2003). However, during the post TGD period, the separation zone almost disappeared (see Figure 6b), because the momentum of the tributary flow seriously reduced (Mr = 0.07) under the high water level condition, and thus the inertial effect of the lateral flow is too small to form a full separation.…”

Section: Resultsmentioning

confidence: 99%

Hydro‐Thermodynamic Processes at a Large Confluence Under Reservoir Regulation

Shi

Sun

Lin

et al. 2022

Water Resources Research

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Section: Resultsmentioning

confidence: 99%

Hydro‐Thermodynamic Processes at a Large Confluence Under Reservoir Regulation

Shi

Sun

Lin

et al. 2022

Water Resources Research

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“…Serger and Nikolay [9] stated that the flow decreased at bifurcation as the flow was separated but it increased at the confluence as the flow converged from multiple channels and this has been agreed upon by many researchers. Hua and Gu [11] studied the flow characteristic at bifurcation and confluence channels with a different width ratio of point bar to channels 1 and 2. The flow at the bigger size remains in the direction of the upstream main channel flow, because the channel with a bigger size is gradually close to the main channel width, so it is easy for water in that channel to hold the direction of the main channel.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Depth-Averaged Velocity and Bed Profile in a Braided Channel with a Mid-Bar

Muhammad Fahmi Arifin,

Zulhilmi Ismail,

Mazlin Jumain

et al. 2023

ARASET

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Braided alluvial rivers with a mid-bar are common features occurred in alluvial river that consists of bifurcation and confluence channels. The formation of the mid-bar will affect the hydraulics of river systems in terms of velocity and bed morphology. The studies corresponding to the typical braided river with a mid-bar are still ongoing. This paper is to present the finding of depth-averaged velocity, Ud and bed profile at the bifurcation and confluence channel. A channel with a mid-bar and erodible bed was used in this research. The experimental work was carried out in the Hydraulic Laboratory at Universiti Teknologi Malaysia, (UTM). In the experiment, two types of flow which are low flow and high flow rates were considered. The study found that depth-averaged velocity distributions are influenced by flow discharge and varied at the braided channel. The highest Ud velocity is 0.35 m/s occurred at the bifurcation area and the lowest Ud is 0.2 m/s that was occurred at the confluence area. This genesis to more erosion occurred at the bifurcation area compared to the confluence area.

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“…In the straight braided rivers, the turbulent flow was strongest in the recirculation zone at the bifurcation, and the contour line of the high turbulence zone tended to be concave bank to convex bank from the bottom to the surface. The turbulence in the confluence segment was also strong (Hua et al, 2009;Khan & Sharma, 2019), and vortex appears at the confluence and the intensity decreases as the water flows downstream(X. Liu et al, 2019;H.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on flow characteristics of compound-braided river channel

ZHANG,

Tong,

Wang

et al. 2023

Preprint

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Braided rivers easily form wide and shallow floodplains when there is no constraints on both sides of the river. During floods, rising water level submerges the floodplain of the bifurcated channel, resulting in the Compound-Braided River. The generalized model was established based on statistical data from the braided river reach of Heilongjiang. In this paper, the flow field of the straight compound-braided river was measured in flume experiments, and then the effect of the interaction of floodplain and main channel on the flow pattern, water level, flow structure and resistance force were studied under overbank flow conditions. The split ratio variation trend is further discussed. The results show that hydraulic factors in diverge segment were mainly related to braided reach, with high longitudinal velocity observed in inner floodplain. The exchange flow between floodplain and main channel accelerates transverse flow and promotes sediment transport intensity laterally. Secondary flow of compound section within the influence range of bifurcated flow was obviously inhibited. Boundary shear stress analysis showed that the diversion ratio of the main tributary under overbank condition decreased slightly and would maintain constant values as surface rise.

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Experiments of Three-Dimensional Flow Structure in Braided Rivers

Cited by 15 publications

References 12 publications

Hydro‐Thermodynamic Processes at a Large Confluence Under Reservoir Regulation

Hydro‐Thermodynamic Processes at a Large Confluence Under Reservoir Regulation

Experimental Study on Depth-Averaged Velocity and Bed Profile in a Braided Channel with a Mid-Bar

Experimental study on flow characteristics of compound-braided river channel

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