By using the RNG k-ε model, we examined the impact of arranging cylindrical obstacles in the pool chamber of vertical slot fishway on the hydraulic characteristics. We comprehensively analyzed the alterations in flow pattern, flow velocity, turbulent kinetic energy (TKE), and volumetric energy dissipation rate (E) in the presence of cylindrical obstacles arranged at different positions. Our findings manifest that the placement of the cylinder at x=1.5b0 and y=3.1b0 (where we designate the intersection between the upstream face of the short baffle and the guide wall as the origin and b0 as the cylinder’s diameter or the vertical slot’s width) does not effectively reduce the maximum velocity in the vertical slot area but decreases the area of low-velocity recirculation, which would possibly reduce fish passing efficiency. When the cylinder is positioned at x=2.2b0 and y=3.1b0, the maximum flow velocity decreases by 12% compared to the conventional layout, creating an “Ω” shaped flow pattern and elongates the streamline in the chamber, conducive for fish migration. However, upon moving the cylinder downstream to x=3.0b0, its positive influence on the hydraulic characteristics within the pool weakens. Although cylinders could effectively lower the maximum TKE and promote a more even distribution of TKE within the pool, the position of cylinders greatly influences the E distribution, and an inappropriate location increases E and thus decreases fish migration efficiency.
Key words
vertical slot fishway /
pool chamber structure /
velocity distribution /
hydraulic characteristics /
turbulent kinetic energy
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References
[1] UNESCO. World Water Development Report[R]. Paris: UNESCO, 2003.
[2] 陈凯麒, 常仲农, 曹晓红, 等. 我国鱼道的建设现状与展望[J]. 水利学报, 2012, 43(2): 182-188, 197.
[3] COUTANT C C,WHITNEY R R. Fish Behavior in Relation to Passage through Hydropower Turbines: A Review[J]. Transactions of the American Fisheries Society, 2000, 129(2): 351-380.
[4] SILVA A T,SANTOS J M,FERREIRA M T,et al. Effects of Water Velocity and Turbulence on the Behaviour of Iberian Barbel (Luciobarbus Bocagei, Steindachner 1864) in an Experimental Pool-Type Fishway[J]. River Research and Applications, 2011, 27(3): 360-373.
[5] RAJARATNAM N,VAN DER VINNE G, KATOPODIS C. Hydraulics of Vertical Slot Fishways[J]. Journal of Hydraulic Engineering, 1986, 112(10): 909-927.
[6] RAJARATNAM N, KATOPODIS C, SOLANKI S. New Designs for Vertical Slot Fishways[J]. Canadian Journal of Civil Engineering, 1992, 19(3): 402-414.
[7] PUERTAS J,PENA L,TEIJEIRO T. Experimental Approach to the Hydraulics of Vertical Slot Fishways[J]. Journal of Hydraulic Engineering,2004,130(1):10-23.
[8] 徐体兵, 孙双科. 竖缝式鱼道水流结构的数值模拟[J]. 水利学报, 2009, 40(11): 1386-1391.
[9] 董志勇, 冯玉平, ERVINE A. 同侧竖缝式鱼道水力特性及放鱼试验研究[J]. 水力发电学报, 2008, 27(6): 121-125.
[10]罗小凤, 李 嘉. 竖缝式鱼道结构及水力特性研究[J]. 长江科学院院报, 2010, 27(10): 50-54.
[11]QUARANTA E,KATOPODIS C,COMOGLIO C.Effects of Bed Slope on the Flow Field of Vertical Slot Fishways[J]. River Research and Applications,2019,35(6):656-668.
[12]LI Y, WANG X, XUAN G, et al. Effect of Parameters of Pool Geometry on Flow Characteristics in Low Slope Vertical Slot Fishways [J]. Journal of Hydraulic Research, 2019, 58(3): 395-407.
[13]TARRADE L, TEXIER A, DAVID L, et al. Topologies and Measurements of Turbulent Flow in Vertical Slot Fishways[J]. Hydrobiologia, 2008, 609(1): 177-188.
[14]王 猛, 史德亮, 陈 辉, 等. 竖缝式鱼道池室结构变化对水力特性的影响分析[J]. 长江科学院院报, 2015, 32(1): 79-83.
[15]BARTON A F, KELLER R J. 3d Free Surface Model for a Vertical Slot Fishway[C]∥Proceedings of the XXX IAHR Congress. Thessoloniki, Greece. August 24-28, 2003.
[16]AN R, LI J, LIANG R,et al. Three-dimensional Simulation and Experimental Study for Optimising a Vertical Slot Fishway[J]. Journal of Hydro-Environment Research, 2016, 12: 119-129.
[17]陈柏宇,袁 浩,何小泷.坡度变化对竖缝式鱼道水力特性的影响研究[J].中国农村水利水电,2022(10):242-248.
[18]MARRINER B A, BAKI A B M, ZHU D Z, et al. Field and Numerical Assessment of Turning Pool Hydraulics in a Vertical Slot Fishway [J]. Ecological Engineering, 2014, 63: 88-101.
[19]Food Agriculture Organization. Fish Passes: Design, Dimensions and Monitoring[M]. Rome: United Nations Food and Agriculture Organization in Arrangement with DVWK, 2002.
[20]CHORDA J, MAUBOURGUET M M, ROUX H, et al. Two-Dimensional Free Surface Flow Numerical Model for Vertical Slot Fishways[J]. Journal of Hydraulic Research, 2010, 48(2): 141-151.
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