Numerical investigation of flow pattern, erosion and sedimentation around parallel unequal spur dikes under different geometric and hydraulic condition: Numerical analysis

Document Type : Research Article

Authors

1 Department of Civil Engg., University of Zanjan

2 Young Researchers and Elite Club, Zanjan Branch, Islamic Azad University, Zanjan, Iran

3 Department of Civil Engg., University of Semnan

Abstract

Spur dikes are known as the most popular hydraulic structures which are utilized to reduce shores and river banks erosion. These structures change the flow and sediment transport pattern and so they can control hydraulic conditions and prevent shores erosion and cause sediment trapping. In this paper effects of changes in angles and various arrangement of spur dikes (small to large or vice versa) for group of parallel, unequal, non-submerged and impermeable spur dikes are numerically investigated on flow pattern, bed erosion and sedimentation. Validation of results of Flow-3D numerical model with experimental data, shows the high precision of the numerical model. Also the results show that scour depth in large to small arrangement of the spur dikes and 45 degrees orientation has 55% reduction and in small to large arrangement and 135 degrees orientation has 72% reduction in comparison with group of equal length spur dikes perpendicular to the shore.

Keywords

References

Abdelaziz, S., Bui, M.D. and Rutschmann, P. (2014). Numerical simulation of scour development due to submerged horizontal jet. River Flow 2010, pp. 1597-1604.
Acharya, A. and Duan, J.G. (2011). Three dimensional simulation of flow field around series of spur dikes. In World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability (pp. 2085-2094).
Al-Khateeb, H.M.M., AL-Thamiry, H.A.K. and Hassan, H.H. (2016). Evaluation of local scour development around curved non-submerged impermeable Groynes, International Journal of Scientific & Technology Research, 5(1), pp. 83-89
Garde, R., Subramanya, K.S. and Nambudripad, K.D. (1961). Study of scour around spur-dikes, Journal of the Hydraulics Division, 87(6), pp. 23-37.
Epely-Chauvin, G., De Cesare, G. and Schwindt, S. (2014). Numerical modelling of plunge pool scour evolution in non-cohesive sediments. Engineering Applications of Computational Fluid Mechanics, 8(4), pp. 477-487.
Ghodsian, M. and Vaghefi, M. (2009). Experimental study on scour and flow field in a scour hole around a T-shape spur dike in a 90 bend, International Journal of Sediment Research, 24(2), pp. 145-158
Giglou, A.N., Mccorquodale, J.A. and Solari, L. (2017). Numerical study on the effect of the spur dikes on sedimentation pattern. Ain Shams Engineering Journal. (In Press) https://doi.org/10.1016/j.asej.2017.02.007
Karami, H., Basser, H., Ardeshir, A. and Hosseini, S.H. (2014). Verification of numerical study of scour around spur dikes using experimental data, Water and environment journal, 28(1), pp. 124-134.
Koken, M. and Gogus, M. (2015). Effect of spur dike length on the horseshoe vortex system and the bed shear stress distribution, Journal of Hydraulic Research, 53(2), pp. 196-206.
Kuhnle, R.A., Alonso, C.V. and Shields, F.D. (1999). Geometry of scour holes associated with 90 spur dikes, Journal of Hydraulic Engineering, 125(9), pp. 972-978.
Li, G., Lang, L. and Ning, J. (2013). 3D Numerical Simulation of Flow and Local Scour around a Spur Dike, In IAHR World Congress (pp. 1-9)
Matinfard, A., Heidarnejad, M. and Ahadian, J. (2013), Effect of Changes in the Hydraulic Conditions on the Velocity Distribution around a L-Shaped Spur Dike at the River Bend Using Flow-3D model, Technical Journal of Engineering and Applied Sciences, 3(16), pp. 1862-1868.
Mehnifard, M., Dalfardi, S., Baghdadi, H. and Seirfar, Z. (2015). Simulation of local scour caused by submerged horizontal jets with Flow-3D numerical model. Desert, 20(1), pp. 47-55.
Melville, B.W. (1992). Local scour at bridge abutments, Journal of Hydraulic Engineering, 118(4), pp. 615-631
Osman, M.A. and Saeed, H.N. (2012). Local Scour Depth at the Nose of Permeable and Impermeable Spur Dike, University Of Khartoum Engineering Journal, 2(1).
Radan, P. and Vaghefi, M. (2016). Flow and scour pattern around submerged and non-submerged T-shaped spur dikes in a 90° bend using the SSIIM model, International Journal of River Basin Management, 14(2), pp. 219-232.
Saneie, M. (2006). Experimental study on effect of
minor spur dike to reduce main spur dike scouring, Watershed Engineering and Management, 2(1), pp. 91-99.
Shields, A. (1936). Anwendung der Aehnlichkeitsmechanik und der Turbulenzforschung auf die Geschiebebewegung. PhD Thesis Technical University Berlin
Vaghefi, M., Ahmadi, A., Faraji, B., Javan, M. and Eghbalzadeh, A. (2014). Numerical Study of Flow Patterns around T shape spur dike And Support Structure, Journal of River Engineering, 2(5).
Van Rijn, L.C. (1987). Mathematical modeling of morphological processes in the case of suspended sediment transport, PhD Thesis, Delft University of Technology, Delft, The Netherlands
Zhang, H. and Nakagawa, H. (2009). Characteristics of local flow and bed deformation at impermeable and permeable spur dykes, Annual Journal of Hydraulic Engineering, JSCE, 53, pp. 145-150.

Files

History

  • Receive Date: 21 October 2017
  • Revise Date: 22 February 2018
  • Accept Date: 12 March 2018

Share

How to cite

Statistics