Free-Surface Flow Over River Bottom Sill: Experimental and Numerical Study
Tóm tắt
This paper reports on a laboratory study that was performed in an experimental model in the Technological Educational Institute of Thessaly. The current research work examines the water surface profile variation in abruptly altered open channel topography. The objective is to investigate the effects of river bottom sills on flow depth for river control protection against floods. A rectangular bottom sill with one edge rounded was placed on the bottom of a rectangular, horizontal, laboratory open flume and measurements were performed of free-surface flow depth over the bottom sill, under steady flow conditions, for different inflow discharges. Moreover, the HEC-RAS simulation model was used to numerically simulate the water surface variation over the rectangular bottom sill, under steady flow conditions. A mixed flow regime simulation was performed in order to validate the transition from subcritical to supercritical flow conditions. The computed flow depth variation over the rectangular bottom sill was compared with the obtained experimental measurements in order to demonstrate the accuracy of the performed measurements. The presented experimental data may be used to assist in the development of new and the verification and refinement of existing river hydraulic numerical simulation models, particularly those which use non-hydrostatic pressure distribution.
Tài liệu tham khảo
Bahallamudi M, Chaudhry H (1992) Computation of flows in open channel transitions. J Hydraul Res 30:77–93
Bravo H, Zheng Y (2000) Turbulent flow over step with rounded edges: experimental and numerical study. J Hydraul Eng 126(1):82–85
Demetriou J, Retsinis E (2013) The length of a weak jump near a sill within inclined channel. J Emerg Technol Adv Eng 3(12):532–535
Farsirotou E, Soulis J, Dermissis V (2002) Comparison of 2-D and 1-D modeling of non-uniform flows in rivers. Proceedings of the International Conference on Protection and Restoration of the Environment VI, Vol. I: 311-317
Farsirotou E, Kotsopoulos S, Xafoulis N, Sanatsios G (2014) Experimental investigation of non-uniform flow in rivers. Proceedings of the 12th International Conference on Protection and Restoration of the Environment, 873-880
Hamidifar H, Omid M (2011) Using a broad crested sill to control hydraulic jump in a triangular channel. J Civil Eng (IEB) 39(2):103–110
Liang J, Ghidaoui M, Deng J, Gray W (2007) A Boltzmann-based finite volume algorithm for surface water flows on cells of arbitrary shapes. J Hydraul Res 45(2):147–264
Meselhe E, Sotiropoulos F, Holly F (1997) Numerical simulation of transcritical flow in open channels. J Hydraul Eng 123(9):774–783
Ozmen-Cagatay H, Kocaman S (2011) Dam-break flow in the presence of obstacle: experiment and CFD simulation. J Eng Appl Comput Fluid Mech 5(4):541–552
US Army Corps of Engineers, Hydrologic Engineering Center (2010) HEC-RAS, River Analysis System, Version 4.1.0
Zerihum Y, Fenton J (2006) One-dimensional simulation model for steady transcritical free surface flows at short length transitions. Adv Water Resour 29:1598–1607