Near Bed Turbulent Bursting Process Analysis around a Spur Dike in a Channel Bend

Document Type : Research Article


1 Assistant Professor, Kharazmi University, Tehran, Iran

2 Professor Water Engineering Research Institute, Tarbiat Modares University, Tehran, Iran


In this paper the near bed turbulence bursting process around a spur dike is investigated. For this purpose the flow field around the spur dike was measured using ADV apparatus and the analysis of the turbulence bursting process was done by using the data. Different parameters such as mean velocities, probability of each events and angle of sweep and ejection event, stability of events, Reynolds shear stress and turbulent energy flux were used to analyze the events. Results of this paper confirm that there is strong relation between scour process and near bed flow field. The latter parameters can be used to find the region with scour potential.  The upstream and downstream reverse flows make strong interaction events but the sweep and ejection events are dominant in the outer region of the reverse flow and in shear flow region and they have the maximum strength. Comparison between the sediment transport process around the spur dike with low and high submergence showed that near the upstream nose of the low submergence spur dike, the Reynolds shear stress is one of the sediment transport doer. However, in high submergence spur dike the maximum value of bed shear stress occurs in the downstream region of the spur dike where the overflow plunges to the bed surface. The differences between the maximum bed shear stress of the low and high degree of submergence of spur dike is one of the reasons for larger scour hole around the low submergence conditions as compared to the high submergence condition. In addition, larger values of the turbulent kinetic energy flux in low submergence condition is another reason.


خسروی مشیزی، م. (1390). "بررسی آزمایشگاهی الگوی جریان و آبشستگی پیرامون آبشکن T شکل مستغرق در قوس90درجه". پایان­نامۀ کارشناسی ارشد، دانشکدۀ مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران.
شریعت زاده، ی. (1390). "بررسی آزمایشگاهی الگوی جریان و آبشستگی پیرامون آبشکن Tشکل جاذب و دافع، مستقر در قوس 90 درجه در حالت استغراق". پایان­نامۀ کارشناسی ارشد، دانشکدۀ مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران.
صفرزاده گندشمین، ا. (1389). "مطالعه آزمایشگاهی الگوی جریان آشفته حول آبشکن با شکل‌های مختلف دماغه". رساله دکتری، دانشکده فنی و مهندسی، دانشگاه تربیت مدرس، تهران.
فضلی،  م. (1387). "مطالعه آزمایشگاهی الگوی آبشستگی پیرامون آبشکن مستقر در قوس 90 درجه". رساله دکتری، دانشکده فنی و مهندسی، دانشگاه تربیت مدرس، تهران.
Bey, A., Faruque, M. and Balachandar, R. (2007). “Two-dimensional scour hole problem: role of fluid structures.” J. Hydr. Eng., 133(4), 414- 431.
Biron, P., Robson, C., Lapoinet, M.F. and Gaskin, S.J. (2004). “Comparing different methods of bed shear stress estimates in simple and complex flow fields.” Earth Surf. Process. Landforms. 29, 1403–1415.
Camino, A., Zhu, D. and Rajaratnam, N. (2012). “Jet diffusion inside a confined chamber.” J. Hydraul. Res. 50(1), 121–128.
Carlos, M., Cantero, N., Nino, Y., and Garcia, H. (2005). “Turbulence measurements with acoustic doppler velocimeters.” J. Hydraul. Eng. 131(12), 1062–1073.
Coleman, S. E., Lauchlan, C. S. and Melville, B. W. (2003). “Clear-water scour development at bridge abutments.” J.  Hydraul. Res., 41(5), 521-532.
Dey, S. and Barbhuiya, A. K. (2006). “Velocity and turbulence in a scour hole at a vertical wall abutment.” Flow. Mea. Instru. 17, 13–21.
Duan, J. G., He, L., Wang, G. Q. and Fu, X. D., (2009). “Mean flow and turbulence around experimental spur dike.” Adv. Water. Resour. 32(12), 1717–1725.
Duan, J. G., He, L., Wang, G. Q. and Fu, X. D. (2011). “Turbulent burst around experimental spur dike.” Int. J. Sediment. Res. 26(4), 471-486.
Elawady, E. and Mansanori, M. (2000). “Experimental study of flow behavior around submerged spur-dike on rigid bed.” Annual J. Hydraulic Eng. 44, 539-544.
Fazli, M, Ghodsian, M. and Salehi Neyshaboury, S. A. A. (2008). “Scour and flow field around a spur dike in a 90° bend”. Int. J. Sediment Res. 23(1), 56-68.
Goring, D. and Nikora, V. (2002) “Despiking acoustic doppler velocimeter data.” J. Hydraul.
Eng, 128(1), 117–126.
Hinze, J. O. (1975). Turbulence. McGraw-Hill Series in Mechanical Engineering.
Kim, H. T., Kline S. J. and Reynolds W. C. (1971). “The production of turbulence near a smooth wall in a turbulent boundary layer.” J. Fluid Mech. 50, 133-160.
Kuhnle, R. A. and Alonso, C. V. (2013). “Flow near a model spur dike with a fixed scoured bed.” Int. J. Sediment Res. 28(3), 349-357.
Kuhnle, R. A., Alonso, C. V. and Jia, Y. J. (2008). “Flow around a submerged trapezoidal spur dike test case.” J. Hydraul. Eng, 128(12), 1087-1093.
Leschziner, M. A. and Rodi, W. (1979). “Calculation of strongly curved open channel flow.” J. Hydrau. Div. 105(10), 1297-1314.
Mianaei, S. J. and Keshavarzy, A. R. (2008). “Spatio-temporal variation of transition probability of bursting events over the ripples at the bed of open channel.” Stoch. Environ. Res. Risk. Assess. 22, 257–264
Nezu, I. and Nakagawa, H. (1993). Turbulene in open-channel flow. IAHR Monograph Series, Balkema, Rotterdam, The Netherlands.
Niell, C. R. (1973). Guide to bridge hydraulics, University of Toronto Press, Toronto, Canada.
Pagliara, S., Hassanabadi, L. and Mahmoudi Kurdistani, S. (2015). “Clear water scour downstream of log deflectors in horizontal channels.” J. Irrig. Drain. Eng. 10.1061/(ASCE)IR.1943-4774.0000869.
Soulsby, R. L. and Dyer, K. R. (1981). “The form of the near-bed velocity profile in a tidally accelerating flow.” J. Geophysical Research, 86, 8067-8074.
Vaghefi, M. and Ghodsian, M. (2009). “Experimental study on the effect of a T-shaped spur dike length on scour in a 90° channel bend.” Arab. J. Sci. Eng., 34(2), 337-348.
Vaghefi, M., Ghodsian, M. and Salehi Neyshabouri, S. A. A. (2012). “Experimental study on scour around a T-shaped spur dike in a channel bend.” J. Hydraul. Eng. 138(5), 471–474.
Yaeger, M. A. (2009). “Mean flow and turbulence around two series of experimental dikes.” Msc Thesis, University of Arizona.