环形波纹钢管涵洞式鱼道内波纹的粗糙度可以使边界附近产生足够低的流速，鱼类可以由此游向上游。对3种流量0.05，0.07，0.09 m3/s，3种埋深0D，0.1D，0.2D，坡度0.4%工况下，环形波纹钢管涵洞式鱼道内水面线、流速场和紊流场分布分别进行了数值模拟研究。结果表明环形波纹钢管涵洞中，高流速区（无量纲流速大于0.9）位于涵洞过水断面中心区域，高紊流区（紊流强度大于0.2）位于水面中心附近。在涵洞底部边壁附近较大区域内，由于流速较小，紊流强度也较低（紊流强度小于0.1），鱼类可以由此顺利完成上溯。相比无埋深式涵洞，嵌入式涵洞内平均流速较小，紊流强度变化较为平缓，更有利于鱼类的洄游。
Abstract
The roughness of annular corrugated steel pipe fishway could generate sufficiently low flow velocities near the boundary, which facilitates fishes to immigrate towards the upstream. In this paper, the water surface line, flow velocity field, and turbulent flow field in the annular corrugated steel pipe culvert fishway are simulated under different conditions (flow rate 0.05 m3/s, 0.07 m3/s and 0.09 m3/s, embedded depth 0D, 0.1D and 0.2D, and slope gradient 0.4%). Results show that high velocity field (dimensionless velocity greater than 0.9) is located in the central area of the cross section of the culvert, and high turbulent flow field (turbulence intensity greater than 0.2) is located near the central area of the water surface. In large areas near the side walls of culvert bottom, due to relatively low velocity, the turbulence intensity is relatively low (less than 0.1) and fishes could complete migration using this passage. Compared with nonembedded culverts, the embedded culvert has lower average velocity and gentle variation of turbulence intensity, therefore it is more conducive to fish migration.
关键词
数值模拟 /
水力特性 /
鱼道 /
波纹钢管涵洞 /
粗糙度 /
高流速区 /
高紊流区
Key words
numerical simulation /
hydraulic characteristics /
fishway /
corrugated steel pipe culvert /
roughness /
high velocity field /
high turbulent flow field
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参考文献
[1]ABBS T J. A Model Study of the Hydraulics Related to Fish Passage Through Backwatered Culverts[C]∥ Proceedings of the 18th Canadian Hydrotechnical Conference: Changes for Water Resources Engineering in a Changing World. Winnipeg, Manitoba, August 22-24, 2007: 1-12.
[2] BATES K. Design of Road Culverts for Fish Passage[R]. USA: Washington Department of Fisheries and Wildlife, 2003.
[3] BARBER M E, DOWNS R C. Investigation of Culvert Hydraulics Related to Juvenile Fish Passage[R]. USA: Washington State Department of Transportation, 1996.
[4] EAD S A,RAJARATNAM N,KATOPODIS C,et al.Turbulent Open-channel Flow in Circular Corrugated Culverts[J]. Journal of Hydraulic Engineering, 2000, 126(10): 750-757.
［5］ 曹庆磊,杨文俊,陈 辉.2010. 同侧竖缝式鱼道水力特性的数值模拟[J].长江科学院报,2010,27(7):26-30.(CAO Qinglei, YANG Wenjun, CHEN Hui. Numerical Simulation of Characteristics of Vertical Slot Fishway on Same One Side[J]. Journal of Yangtze River Scientific Research Institute, 2010, 27(7): 26-30. (in Chinese))
[6] HUNT M,CLARK S, KEHLER N. A Model Study of the Hydraulics Related to Fish Passage in a CSP Culvert with a Vertical Headwall[C]∥Proceedings of the 8th International Symposium on Ecohydraulics. Seoul, Korea, September 12-16, 2010: 1-8.
[7] GARNER M E, KELLS J A, KATOPODIS C.A Model Study of the Hydraulics Related to Fish Passage through Embedded Culverts[C]∥ Proceedings of the Joint Conference of IAHR, ASCE and CSCE. Vancouver, August 9-14, 2009: 1-8.
[8] ENDERS E C, BOISCLAIR D, ROY A G. The Effect of Turbulence on the Cost of Swimming for Juvenile Atlantic Salmon (Salmo salar)[J]. Canadian Journal of Fisheries and Aquatic Sciences, 2003, 60(9): 1149–1160.
[9] ENDERS E C, BOISCLAIR D, ROY A G. A Model of Total Swimming Costs in Turbulent Flow for Juvenile Atlantic Salmon(Salmo salar)[J]. Canadian Journal of Fisheries and Aquatic Sciences, 2005, 62(5): 1079–1089.
[10]SMITH D L, BRANNON E L, ODEH M. Response of Juvenile Rainbow Trout to Turbulence Produced by Prismatoidal Shapes[J]. Transactions of American Fisheries Society, 2005, 134(3): 741-753.
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