Effect of the sediment discharge on the equilibrium bed morphology of movable bed open-channel confluences

Geomorphology ◽  
2020 ◽  
Vol 367 ◽  
pp. 107329
Author(s):  
G. Bombar ◽  
A.H. Cardoso
Keyword(s):  
Open Channel ◽  
Sediment Discharge ◽  
Bed Morphology ◽  
Movable Bed

scholarly journals ANALYSIS OF OPEN-CHANNEL CONFLUENCE FLOW HAVING DIFFERENT STEEP SLOPES IN FIXED BED AND MOVABLE BED

2007 ◽  
Vol 51 ◽  
pp. 823-828
Author(s):  
Takashi DEGUCHI ◽  
Ichiro FUJITA ◽  
Ryota TSUBAKI ◽  
Masashi OZONO
Keyword(s):  
Open Channel ◽  
Fixed Bed ◽  
Steep Slopes ◽  
Movable Bed ◽  
Channel Confluence

scholarly journals Effect of vegetation on flows and sediment transport

2018 ◽  
Vol 40 ◽  
pp. 02017
Author(s):  
Hela Romdhane ◽  
Amel Soualmia ◽  
Ludovic Cassan ◽  
Gilles Belaud
Keyword(s):  
Shear Stress ◽  
Sediment Transport ◽  
Open Channel ◽  
Sediment Accumulation ◽  
Bedload Transport ◽  
Reasonable Accuracy ◽  
Physical Processes ◽  
Flow Measurements ◽  
Flow And Sediment Transport ◽  
Movable Bed

Vegetation is a common feature in natural coastal and riverine waters, interacting with both water flow and sediment transport. However, the physical processes governing these interactions are still poorly understood, which makes it difficult to predict sediment transport and associated morphodynamics in a vegetated environment. In this context, an experimental study was conducted in laboratory with a movable bed trapped in artificial vegetation. The experimental flume is a rectangular open channel 5.75 m long and 0.29 m wide. For flow measurements, the channel is equipped with a fast camera and ADV probe. This work focuses on identifying the vegetation effects on flows and sediment transport. In fact, it was shown that the vegetation presence in a watercourse promotes deposition and sediment accumulation. This is explained by a reduction of the bed shear stress, since the friction occurs mainly by the drag force effect exerted by the vegetation. It was shown too that the vegetation reduced the bedload transport. Thanks to the partitioning of shear stress, it was possible to predict the bedload transport using standard formulas with a reasonable accuracy.

scholarly journals SEDIMENT DISCHARGE FORMULA FOR STEEP OPEN CHANNEL

1998 ◽  
Vol 42 ◽  
pp. 1069-1074
Author(s):  
Muneo HIRANO ◽  
Haruyuki HASHIMOTO ◽  
Hiroaki TAGAWA
Keyword(s):  
Open Channel ◽  
Sediment Discharge

Subcritical flow in open channel expansions with movable bed

1987 ◽  
Vol 25 (1) ◽  
pp. 89-102 ◽  
Author(s):  
C. Fouladi Nashta ◽  
R. J. Garde ◽  
P. K. Swa Mee
Keyword(s):  
Open Channel ◽  
Subcritical Flow ◽  
Movable Bed

Une contribution pratique à l'estimation du transport des sédiments dans un écoulement fluvial

1994 ◽  
Vol 21 (3) ◽  
pp. 490-498
Author(s):  
A. Sadok ◽  
C. Marche
Keyword(s):  
Sediment Transport ◽  
Open Channel ◽  
Flow Model ◽  
Model Performance ◽  
Open Channel Flow ◽  
Sediment Discharge ◽  
Open Channel Flows ◽  
Complex Procedure ◽  
Key Words Sediment

Several computational methods of sediment discharge in open channel flows are reported in the existing literature. However, sediment transport is a complex procedure that implies several parameters which in some cases are difficult to estimate. Even if direct confrontations of methods used are published, it is difficult to draw significant conclusions that would help determine a model or the models likely to produce the best results for a specific case. To facilitate that choice, the authors have attempted to establish a classification of the various methods commonly used by determining their relative performance, and to improve the performance by proposing a new model which distinguishes the type of sediment transport and the nature of the bed. Key words: sediment discharge, sediment transport, open channel flow, model, performance.[Journal translation]

scholarly journals A SEDIMENT DISCHARGE FORMULA FOR VARIOUS TYPES OF SEDIMENT TRANSPORT IN A STEEP OPEN CHANNEL

2003 ◽  
Vol 47 ◽  
pp. 571-576
Author(s):  
Haruyuki HASHIMOTO ◽  
Kichan PARK ◽  
Shinya IKEMATSU ◽  
Nobutada TASAKI
Keyword(s):  
Sediment Transport ◽  
Open Channel ◽  
Sediment Discharge

scholarly journals Effect of a Submerged Vane-Field on the Flow Pattern of a Movable Bed Channel with a 90° Lateral Diversion

Water ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 828
Author(s):  
Joana Baltazar ◽  
Elsa Alves ◽  
Gökçen Bombar ◽  
António Heleno Cardoso
Keyword(s):  
Flow Pattern ◽  
Water Discharge ◽  
Main Channel ◽  
Bed Load ◽  
Bed Morphology ◽  
Discharge Ratio ◽  
Submerged Vane ◽  
Diversion Channel ◽  
Movable Bed ◽  
Lateral Diversion

This laboratory study focused on the effect of a submerged vane-field on the flow pattern and bed morphology near and inside the entrance reach of a movable bed 90° lateral diversion. The system was modelled under live bed conditions for a water discharge ratio of ≈0.2. Two experiments were run until bed equilibrium was reached: with and without a vane-field installed close to the diversion entrance to control the transfer of sediments into the diversion channel. The equilibrium bed morphology and the associated 3D flow field were measured in great detail. The bed load diverted into the diversion was reduced by approximately one quarter due to the action of the vane-field. The vanes prevented the formation of the diversion vortex in the main channel, upstream of the diversion’s entrance, thus contributing to that decrease. They also created a main channel vortex that started at the most upstream vanes and further decreased the amount of bed load entering the diversion. The flow separation zone inside the diversion was larger with vanes, but conveyance was balanced through a slightly deeper scour trench therein. The flow structures described were confirmed through the measurements of the turbulent kinetic energy.

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