Numerical study of junction-angle effects on flow pattern in a river confluence located in a river bend
| Autor: | Parisa Koochak, R Ghobadian, Zahra Seydi Tabar |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
geography
geography.geographical_feature_category 0208 environmental biotechnology River confluence Geometry flow pattern junction angle 180 degree bend SSIIM1 numerical model 02 engineering and technology Management Monitoring Policy and Law Flow pattern Curvature Secondary flow Applied Microbiology and Biotechnology junction angle 020801 environmental engineering Water level Tributary Shear stress SSIIM1 numerical model Geotechnical engineering 180 degree bend flow pattern Waste Management and Disposal Pressure gradient Geology Water Science and Technology |
| Zdroj: | Water SA; Vol 42, No 1 (2016); 43-51 Water SA, Volume: 42, Issue: 1, Pages: 43-51, Published: JAN 2016 |
| ISSN: | 0378-4738 |
| Popis: | 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. Keywords: flow pattern, junction angle, 180 degree bend, SSIIM1 numerical model |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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