Effect of Duration on Variations in Bed Topography and Water Surface Profile in a Meandering Channel

Document Type : Research Paper

Authors

1 Department of Water Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.

2 Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

Abstract

In this study, variations in water surface profile and bed topography along a meandering path were examined under different experiment durations. Although several studies have been conducted on sediment and scour in open channels, addressing temporal variations in meandering channels requires independent, merely experimental research. In this regard, a meandering laboratory flume consisting of two consecutive 180-degree bends was used in this study. The test was conducted under clear water conditions and in 6 different durations equal to 0.2, 0.4, 0.5, 0.6, 0.8, and 1 times the equilibrium time (240 minutes). Results indicated that at the downstream bend, lengthening the test time from 0.2 to 0.4, 0.5, 0.6, 0.8, and 1 times the equilibrium time added to the maximum scour by 70, 100, 115, 120, and 165%, and also increased the maximum sedimentation by 30, 25, 45, 45, and 45%, respectively. Moreover, with a comparison made between the average transversal water surface profile for 0, 120, and 240-minute duration tests, it was observed that when these transversal profiles were displaced from 45 degrees to 90, 135, and 180 degrees, the water surface at the inner bank was lowered by 2, 5, and 7% and that at the outer bank decreased by 2, 6, and 12%, respectively.

Keywords

References

  1. Dey S, Papanicolaou A, (2008). Sediment threshold under stream flow: A state-of-the-art review. KSCE Journal of Civil Engineering, 12(1), pp: 45-60.
  2. Odgaard AJ, (1986). Meander flow model. I: Development. Journal of Hydraulic Engineering, 112(12), pp: 1117-1135.
  3. Ervine DA, Willetts BB, Sellin RHJ, Lorena M, (1993). Factors affecting conveyance in meandering compound flows. Journal of Hydraulic Engineering, 119(12), pp: 1383-1399.
  4. Yen CL, Lee KT, (1995). Bed topography and sediment sorting in channel bend with unsteady flow. Journal of Hydraulic Engineering, 121(8), pp: 591-599.
  5. Blanckaert K, Graf WH (2001). Mean flow and turbulence in open-channel bend. Journal of Hydraulic Engineering, 127(10), pp: 835-847.
  6. Spooner J, Shiono K, (2003). Modelling of meandering channels for overbank flow. Proceedings of the Institution of Civil Engineers-Water and Maritime Engineering, 156(3), pp: 225-233.
  7. Blanckaert K, Graf WH, (2004). Momentum transport in sharp open-channel bends. Journal of Hydraulic Engineering, 130(3), pp: 186-198.
  8. Roca M, Martín-Vide JP, Blanckaert K, (2007). Reduction of bend scour by an outer bank footing: footing design and bed topography. Journal of Hydraulic Engineering, 133(2), pp: 139-147.
  9. Kleinhans MG, Schuurman F, Bakx W, Markies H, (2009). Meandering channel dynamics in highly cohesive sediment on an intertidal mud flat in the Westerschelde estuary, the Netherlands. Geomorphology, 105(3-4), pp: 261-276.
  10. Wang B, Jia D, Zhou G, Shao X, (2009). An experimental investigation on flow structure in channel with consecutive bends. In: Advances in Water Resources and Hydraulic Engineering, Springer, Berlin, Heidelberg, Germany.
  11. Nicoll TJ, Hickin EJ, (2010). Planform geometry and channel migration of confined meandering rivers on the Canadian prairies. Geomorphology, 116(1-2), pp: 37-47.
  12. Barbhuiya AK, Talukdar S, (2010). Scour and three dimensional turbulent flow fields measured by ADV at a 90 horizontal forced bend in a rectangular channel. Flow measurement and Instrumentation, 21(3), pp: 312-321.
  13. Uddin MN, Rahman MM, (2012). Flow and erosion at a bend in the braided Jamuna River. International Journal of Sediment Research, 27(4), pp: 498-509.
  14. Xu D, Bai Y, (2013). Experimental study on the bed topography evolution in alluvial meandering rivers with various sinuousnesses. Journal of Hydro-environment Research, 7(2), pp: 92-102.
  15. Termini D, (2015). Momentum transport and bed shear stress distribution in a meandering bend: Experimental analysis in a laboratory flume. Advances in Water Resources, 81, pp: 128-141.
  16. Mera I, Franca MJ, Anta J, Peña E, (2015). Turbulence anisotropy in a compound meandering channel with different submergence conditions. Advances in Water Resources, 81, pp: 142-151.
  17. Schuurman F, Shimizu Y, Iwasaki T, Kleinhans MG, (2016). Dynamic meandering in response to upstream perturbations and floodplain formation. Geomorphology, 253, pp: 94-109.
  18. Liu C, Shan Y, Liu X, Yang K, Liao H, (2016). The effect of floodplain grass on the flow characteristics of meandering compound channels. Journal of Hydrology, 542, pp: 1-17.
  19. Azarisamani A, Keshavarzi A, Hamidifar H, Javan M, (2020). Effect of Rigid Vegetation on Velocity Distribution and Bed Topography in a Meandering River with a Sloping Bank. Arabian Journal for Science and Engineering, 45(10), pp: 8633-8653.
  20. Moghaddassi N, Musavi-Jahromi SH, Vaghefi M, Khosrojerdi A, (2021). Effect of Mean Velocity-to-Critical Velocity Ratios on Bed Topography and Incipient Motion in a Meandering Channel: Experimental Investigation. Water, 13(7), p: 883.
  21. Chiew YM, (1992). Scour protection at bridge piers. Journal of Hydraulic Engineering, 118(9), pp: 1260-1269.
  22. Vittal N, Kothyari UC, Haghighat M, (1994). Clear-water scour around bridge pier group. Journal of Hydraulic Engineering, 120(11), pp: 1309-1318.
  23. Kumar V, Raju KGR, Vittal N, (1999). Reduction of local scour around bridge piers using slots and collars. Journal of Hydraulic Engineering, 125(12), pp: 1302-1305.
  24. Melville BW, Chiew YM, (1999). Time scale for local scour at bridge piers. Journal of Hydraulic Engineering, 125(1), pp: 59-65.
  25. Hasegawa K, (1983). Hydraulic research on planimetric forms, bed topographies and flow in alluvial rivers. Doctoral dissertation, Hokkaido University, Sapporo, Japan.
  26. Holzwarth S, (2006). Bed deformation in sine-generated meandering streams having large values of the width-to-depth ratio. Doctoral dissertation, Technische Universität Hamburg-Harburg, Germany, and Queen’s Univ., Kingston, Canada.
  27. Whiting PJ, Dietrich WE, (1993). Experimental studies of bed topography and flow patterns in large‐amplitude meanders: 1. Observations. Water Resources Research, 29(11), pp: 3605-3614.
  28. Termini D, (1996). Evolution of a meandering channel with an initial flat bed. Theoretical and experimental study of the channel bed and the initial kinematic characteristics of flow. Doctoral dissertation, University of Palermo, Palermo, Italy.
  29. Binns AD, da Silva AMF, (2009). On the quantification of the bed development time of alluvial meandering streams. Journal of Hydraulic Engineering, 135(5), pp: 350-360.
  30. Binns AD, da Silva AMF, (2011). Rate of growth and other features of the temporal development of pool-bar complexes in meandering streams. Journal of Hydraulic Engineering, 137(12), pp: 1565-1575.
  31. Binns A, (2012). Nature and time-scale of bed morphological adjustments towards equilibrium in meandering streams: an experimental study. Doctoral dissertation, Queen’s University Kingston, Ontario, Canada.
  32. Binns AD, da Silva AMF, (2015). Meandering bed development time: Formulation and related experimental testing. Advances in Water Resources, 81, pp: 152-160.
  33. Harrison LR, Legleiter CJ, Wydzga MA, Dunne T, (2011). Channel dynamics and habitat development in a meandering, gravel bed river. Water Resources Research, 47(4), pp: 1-21.
  34. Buehler HA, Weissmann GS, Scuderi LA, Hartley AJ, (2011). Spatial and temporal evolution of an avulsion on the Taquari River distributive fluvial system from satellite image analysis. Journal of Sedimentary Research, 81(8), pp: 630-640.
  35. Wang S, Li L, Ran L, Yan Y, (2016). Spatial and temporal variations of channel lateral migration rates in the Inner Mongolian reach of the upper Yellow River. Environmental Earth Sciences, 75(18), pp: 1-14.
  36. Bertalan L, Rodrigo-Comino J, Surian N, Michalková MŠ, Kovacs Z, Szabó S, Szabó G, Hooke J, (2019). Detailed assessment of spatial and temporal variations in river channel changes and meander evolution as a preliminary work for effective floodplain management. The example of Sajó River, Hungary. Journal of Environmental Management, 248, p: 109277.
  37. Saleem A, Dewan A, Rahman MM, Nawfee SM, Karim R, Lu XX (2020). Spatial and temporal variations of erosion and accretion: A case of a large Tropical River. Earth Systems and Environment, 4(1), pp: 167-181.
  38. Raudkivi AJ, Ettema R, (1983). Clear-water scour at cylindrical piers. Journal of Hydraulic Engineering, 109(3), pp: 338-350.
  39. Oliveto G, Hager WH, (2002). Temporal evolution of clear-water pier and abutment scour. Journal of Hydraulic Engineering, 128(9), pp: 811-820.
  40. Neill CR, (1968). Note on initial movement of coarse uniform bed-material. Journal of hydraulic research, 6(2), pp: 173-176.
  41. Rasaei M, Nazari S, Eslamian S, (2020). Experimental and numerical investigation the effect of pier position on local scouring around bridge pier at a 90° convergent bend. Journal of Hydraulic Structures, 6(1), pp: 55-76.
  42. Rasaei M, Nazari S (2020). Experimental and Numerical Investigation of Local Scouring around Bridge Piers in Different Geometric Shapes at a 90° Convergent meander. Journal of Hydraulic Structures, 6(2), pp: 34-55.
  43. Abdi Chooplou C, Vaghefi M, Meraji SH (2018). Study of Streamlines under the Influence of Displacement of Submerged Vanes in Channel Width, and at the Upstream Area of a Cylindrical Bridge Pier in a 180 Degree Sharp Bend. Journal of Hydraulic Structures, 4(1), pp: 55-74.
  44. Termini D, (2009). Experimental observations of flow and bed processes in large-amplitude meandering flume. Journal of Hydraulic Engineering, 135(7), pp: 575-587.
  45. Eghbalnik L, Vaghefi M, GolbaharHaghighi MR (2019). Laboratory study of the temporal evolution of channel bed topography in presence of two rows of inclined-vertical piers in a sharp 180-degree bend. ISH Journal of Hydraulic Engineering, pp: 1-8.
  46. Vaghefi M, Solati S, Abdi Chooplou C (2020). The effect of upstream T-shaped spur dike on reducing the amount of scouring around downstream bridge pier located at a 180° sharp bend. International Journal of River Basin Management, pp: 1-12.
  47. Vaghefi M, Akbari M, Fiouz AR, (2016). An experimental study of mean and turbulent flow in a 180 degree sharp open channel bend: Secondary flow and bed shear stress. KSCE Journal of Civil Engineering, 20(4), pp: 1582-1593.

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