Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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An Experimental Study on the Effect of a Hydraulic Structure on the Three-dimensional Flow in a Meandering Channel

만곡수로 내 수리구조물 설치에 따른 3차원 흐름 특성변화 실험 연구

  • Lee, Dong Hun (Department of Civil and Environmental Engineering, Hanyang University) ;
  • Kim, Su Jin (Department of Civil and Environmental Engineering, Hanyang University) ;
  • Kang, Seokkoo (Department of Civil and Environmental Engineering, Hanyang University)
  • 이동훈 (한양대학교 공과대학 건설환경공학과) ;
  • 김수진 (한양대학교 공과대학 건설환경공학과) ;
  • 강석구 (한양대학교 공과대학 건설환경공학과)
  • Received : 2015.04.07
  • Accepted : 2015.06.19
  • Published : 2015.08.31
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Abstract

The objective of this study is to examine the three-dimensional turbulent flows occurring in the meandering channel with presence of a groyne. A series of laboratory experiments are carried out in a meandering channel with trapezoidal cross sections. The channel is a 24.4 m long, 1.5 m wide, and the bottom slope in the longitudinal direction is 0.02. Two cases with and without the groyne are considered in the experiment. Three-dimensional velocity fields are measured using an acoustic Doppler velocimetry (ADV) at approximately sixty locations in each cross section. The measured velocity fields are averaged in time, and the time-averaged flow revealed that the mean velocity magnitude along the outer bank of the channel was reduced significantly and the direction of the primary flow was directed toward the center of the channel due to the presence of the groyne.

본 연구에서는 하도 내 수제 형 수리구조물을 설치하였을 때, 만곡수로와 수충부에서의 흐름 양상 변화를 3차원 유속 측정을 통해 확인하였다. 연구를 위해 길이 24.4m, 폭 1.5m, 하상경사 2%의 만곡수로에서 실험을 수행하였다. 실험은 단일 수제의 설치 여부에 따라 크게 두 가지 경우로 나누어 수행하였다. 유속의 측정에는 3차원 초음파 유속계(Acoustic Doppler velocimeter, ADV)를 사용하였으며 각 단면 당 약60개의 측점을 선정하여 일정한 시간 동안 측정하였다. 측정된 유속들은 시간 평균하였으며, 각 단면에서의 측정결과를 연결하여 만곡수로의 수면유속을 파악하였다. 그 결과, 수제설치로 인해 구조물 하류에 위치한 만곡부 외측에서의 유속이 현저하게 감소하였고 제방을 향했던 흐름의 방향이 내측으로 변화하였음을 확인할 수 있었다.

Keywords

References

  1. Baek, K.O., Seo, I.W. and Lee, K.W. (2006). "New Equation on Streamwise Variation of Secondary Flow in Meandering Channels." Journal of the Korean Society of Civil Engineers, KSCE, Vol. B 26, No. 4B, pp. 371-378.
  2. Bhuiyan, F., Hey, R.D., and Wormleaton, P.R. (2010), "Bank-attached vanes for bank erosion control and restoration of river meanders." Journal of Hydraulic Engineering, Vol. 136, No. 9, pp. 583-596. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000217
  3. Blanckaert, K., and de Vriend, H.J. (2003). "Nonlinear modeling of mean flow redistribution in curved open channels." Water Resources Research, Vol. 39, No. 12, pp. 1375.
  4. Blanckaert, K., and Lemmin, U. (2006). "Means of noise reduction in acoustic turbulence measurements." Journal of Hydraulic Research, IAHER, Vol. 44, No. 1, pp. 3-17. https://doi.org/10.1080/00221686.2006.9521657
  5. Chang, H.H. (1988), Fluvial processes in river engineering, John Wiley & Sons, Inc., N.Y.
  6. Demuren, A.O., and Rodi, W. (1986). "Calculation of flow and pollutant dispersion in meandering channels." Journal of Fluid Mechanics, Vol. 172, pp. 63-92. https://doi.org/10.1017/S0022112086001659
  7. Duan, J.G. (2009). "Mean flow and turbulence around a laboratory spur dike." Journal of Hydraulic Engineering, Vol. 135, No. 10, pp. 803-811. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000077
  8. Islam, G.M., Tamai, N., and Kobayashi, K. (2000). "Hydraulic characteristics of a doubly meandering compound channel." Building Partnerships, 1-9.
  9. Johannesson, H., and Parker, G. (1989). "Secondary flow in mildly sinuous channel." Journal of Hydraulic Engineering, Vol. 115, No. 3, pp. 289-308. https://doi.org/10.1061/(ASCE)0733-9429(1989)115:3(289)
  10. Kang, J.G., Kim, S.J., and Yeo, H.K. (2004). "An Experimental Study on Flow Pattern at Regime of Impermeability and Permeability Groynes Series." Proceeding of KSCE Annual Conference & Civil Exposition, KSCE, 3337-3342.
  11. Kang, S., and Sotiropoulos, F. (2011). "Flow phenomena and mechanisms in a field-scale experimental meandering channel with a pool-riffle sequence: Insights gained via numerical simulation." Journal of Geophysical Research-Earth Surface, 116, F03011.
  12. Kim, S.J., Kang, J.G., and Yeo, H.K. (2004). "An Experimental Study on Tip Velocity and Downstream Separation Layer at Single Groynes of Permeability Change." Proceeding of KSCE Annual Conference & Civil Exposition, KSCE, 934-939.
  13. Kim, T.W. (2007). Evolution of Velocity Distribution due to Secondary Currents in Sharp Open Channel Bend, Ph.D dissertation, Seoul national university.
  14. Korea Water Resources Assoiciation (2009), Design Standard of River, Ministry of Land, Transport and Maritime Affairs, 422-433
  15. Nikora, V.I., and Goring, D.G. (1998). "ADV measurements of turbulence: Can we improve their interpretation?" Journal of Hydraulic Engineering, Vol. 124, No. 6, pp. 630-634. https://doi.org/10.1061/(ASCE)0733-9429(1998)124:6(630)
  16. Odgaard, A.J. (1986), "Meander flow model. I: Development." Journal of Hydraulic Engineering. Vol. 112, No. 12, pp. 1117-1135. https://doi.org/10.1061/(ASCE)0733-9429(1986)112:12(1117)
  17. Parsheh, M., Sotiropoulos, F., and Porte-Agel, F. (2010). "Estimation of power spectra of acoustic-Doppler velocimetry data contaminated with intermittent spikes." Journal of Hydraulic Engineering, Vol. 136, pp. 368-378. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000202
  18. Rusello, P.J., Lohrmann, A., Siegel, E., and Maddux, T. (2006). "Improvements in acoustic doppler velocimetry." In: Proceedings of the Seventh International Conference on Hydroscience and Engineering, ICHE-2006, September 10-13.
  19. Sharma, K., and Mohapatra, P. (2012). "Seperation zone in flow past a spur dyke on rigid bed meandering channel." Journal of Hydraulic Engineering, Vol. 138, No. 10, pp. 897-901. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000586
  20. Shiono, K., and Muto, Y. (1998). "Complex flow mechanisms in compound meandering channels with overbank flow." Journal of Fluid Mechanics, Vol. 376, pp. 221-261. https://doi.org/10.1017/S0022112098002869
  21. Shiono, K., Chan, T.L., Spooner, J., Rameshwaran, P., and Chandler, J.H. (2009). "The effect of floodplain roughness on flow structures, bedforms and sediment transport rates in meandering channels with overbank flows: Part I." Journal of Hydraulic Research, Vol. 47, No. 1, pp. 5-19. https://doi.org/10.3826/jhr.2009.2944-I
  22. Sukhodolov, A.N. (2014). "Hydrodynamics of groyne fields in a straight river reach: Insight from field experiments." Journal of Hydraulic Research, Vol. 52, No. 1, pp. 105-120. https://doi.org/10.1080/00221686.2014.880859
  23. Tominaga, A., and Nezu, I. (1991). "Turbulent structure in compound open-channel flows." Journal of Hydraulic Engineering, Vol. 117, No. 1, pp. 21-41. https://doi.org/10.1061/(ASCE)0733-9429(1991)117:1(21)
  24. Tominaga, A., Nezu, I., Ezaki, K., and Nakagawa, H. (1989). "Three-dimensional turbulent structure in straight open channel flows." Journal of Hydraulic Research, Vol. 27, No. 1. pp. 149-173. https://doi.org/10.1080/00221688909499249
  25. Wormleaton, P.R., Hey, R.D., Sellin, H.J., Brynat, T., Loveless, J., and Catmur, S.E. (2005). "Behavior of meandering overbank channels with graded sand beds." Journal of Hydraulic Engineering, Vol. 131, pp. 665-681. https://doi.org/10.1061/(ASCE)0733-9429(2005)131:8(665)
  26. Wormleaton, P.R., Sellin, H.J., Bryant, T., Loveless, J., Hey, R.D., and Catmur, S.E. (2004). "Flow structures in a two-stage channel with a mobile bed." Journal of Hydraulic Research, Vol. 42, No. 2, pp. 145-162. https://doi.org/10.1080/00221686.2004.9728378
  27. Yeo, H.K., Kim, S.J., Kang, J.G., and Yoon, B.M. (2004). "An Experimental Study on Scour around Single Groynes." Proceeding of KSCE Annual Conference & Civil Exposition, KSCE, 2108-2113.
  28. Yossef, M.F., and de Vriend, H.J. (2010). "Flow details near river groynes: experimental investigation." Journal of Hydraulic Engineering, Vol. 137, No. 5, pp. 504-516.

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