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Numerical study of junction-angle effects on flow pattern in a river confluence located in a river bend

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      Abstract

      The effect of main channel curvature on the flow pattern in river junctions is a complex and important issue. The 3-dimensional flow pattern in a river bend with a lateral or tributary channel is not only affected by the centrifugal force and pressure gradient but is also affected by the tributary channel's momentum. Understanding this phenomenon requires extensive research: in this study the effect of 4 tributary junction angles, placed at a 45° angle from the beginning of the bend, is studied using SSIIM1 software. The effect of the junction angle on the vertical and transverse velocity profile, water level changes in the main channel, bed shear-stress distribution and secondary flow strength were evaluated. The results showed that by increasing the junction angle from 30° to 115° the streamwise velocity in the vicinity of the centre line and the inner wall of the bend increases. Increasing the junction angle also increases the separation zone dimensions, maximum bed shear stress, difference between the upstream and downstream water level in the junction and the secondary flow strength.

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      Most cited references 25

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      Numerical simulation of three-dimensional, time-averaged flow structure at river channel confluences

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        Large Eddy Simulation of periodic flow characteristics at river channel confluences

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          Flow structure and channel morphology at a natural confluent meander bend

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            Author and article information

            Affiliations
            [1 ] Razi University Iran
            [2 ] Shahid Chamran University Iran
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Journal
            wsa
            Water SA
            Water SA
            Water Research Commission (WRC)
            1816-7950
            January 2016
            : 42
            : 1
            : 43-51
            S1816-79502016000100006
            10.4314/wsa.v42i1.06

            This work is licensed under a Creative Commons Attribution 4.0 International License.

            Product
            Product Information: SciELO South Africa
            Categories
            Water Resources

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