Investigation of bed morphological variations in channels with a group of parallel unequal spur dikes at various orientations

Document Type : Original Article

Authors

1 Department of Civil Engineering, University of Zanjan

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

3 –Ph.D. candidate, Department of Civil Engg., University of Semnan, Iran

Abstract

Spur dikes are structures which are constructed at an angle or perpendicular to flow to reduce flow velocity and bank erosion. As constricting structures, spur dikes narrow the flow channel and alter the flow structure in their vicinity, and develop vortices around the constricted region. In this paper the flow pattern alteration and bed morphological variation due to the various orientations of a group of parallel impermeable, non-submerged spur dikes having unequal lengths are numerically investigated. Numerical model validation is carried out utilizing experimental data. The results show that changing the orientation of spur dikes from 90° to 45° (reduction of channel width constriction by 12%), the maximum depth of scouring beneath the first spur dike is reduced by 50%.

Keywords

References

 
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).
Basser, H., Karami, H., Shamshirband, S., Akib, S., Amirmojahedi, M., Ahmad, R., Jahangirzadeh, A. and Javidnia, H., 2015, Hybrid ANFIS–PSO approach for predicting optimum parameters of a protective spur dike. Applied Soft Computing, 30, pp.642-649.
Chang et al. 2013, Two-Dimensional Numerical Investigation for Short- and Long-Term Effects of Spur Dikes on Weighted Usable Area of Rhinogobius candidianus (Goby)
Duan, J.G. and Nanda, S.K. (2006) Two-Dimensional Depth-Averaged Model Simulation of Suspended Sediment Concentration Distribution in a Groyne Field. Elsevier, J. Hydrol., 327,426–437.
Flow Science Inc. 2015, FLOW-3D User’s manual. Version 11.1
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. Intl. J. Sedim. Res., 24 (2), 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., Ardeshir, A., Saneie, M., Behzadian, K., jalilsani F., 2008 Reduction of local scouring with protective spur dike
Karami, H., Ardeshir, A., Saneie, M. and Salamatian, S.A., 2012, Prediction of time variation of scour depth around spur dikes using neural networks, Journal of Hydroinformatics, 14(1), pp.180-191
Karami, H., Basser, H., Ardeshir, A., & Hosseini, S. H. 2014, Verification of numerical study of scour around spur dikes using experimental data. Water and Environment Journal, 28(1), 124-134.
Kuhnle, R.A., Jia, Y. and Alonso, C.V. (2008) Measured and Simulated Flow near a Submerged Spur Dike. ASCE, J. Hydr. Eng., 137 (7), 916–924.
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)
Mendoza-Cabrales, C. (1993). "Computation of flow past a cylinder mounted on a flat plate." Proc. Hydraulic Eng., ASCE Reston, Va., 899-904.
Shields, A. (1936), Application of the theory of similarity and turbulence research to the bed load movement, Mitt. Preuss. Vets., Wasset Schiff, 26, 5-24.
Uijttewaal, W.S., 2005. Effects of groyne layout on the flow in groyne fields: Laboratory experiments. Journal of Hydraulic Engineering, 131(9), pp.782-791
Van Rijn, L. C. (1987). Mathematical modeling of morphological processes in the case of suspended sediment transport (pp. Communication-No). Delft: Waterloo pkundig Laboratorium.‏
ZHANG, H. and NAKAGAWA, H., 2008. Scour around spur dyke: recent advances and future researches, Annuals of disaster prevention research institute, Kyoto University, No. 51B

Files

Share

How to cite

Statistics