Study of the Local Scour Around L-Shape Groynes in Clear Water Conditions

  • Authors

    • Saleh I. Khassaf
    • Hiba A. Abbas
    2018-11-28
    https://doi.org/10.14419/ijet.v7i4.20.25938
  • Clear water conditions, L-shape groynes, local scour, river training structures, sediment transport.

  • Abstract

    River training structures; such as groynes; are efficient engineered methods utilized to protect eroding river banks. But during groynes design stage; the designers faces one of the most significant issues which is the evaluation of the maximum depth of local scour around groynes. This is due to the flow area constriction in the groyne location itself; which in turn cause increasing in local velocity that consequently causes the scour. In the present study, the maximum scour depth around L-shape groyne was computed based on laboratory experiments where different number of groynes and distances between them were used as sort of countermeasures to reduce the scour around the groynes foundations. The results showed clear decreasing in scour depth at increasing number of groynes and also distance between them in the limitation of this study.  A new formula based on experimental data was derived to calculate the local scour depth. This formula gave R2 =0.903 which reflecting good agreement to the results.

     

     

  • References

    1. [1] Al-Yassiry, H. H., (2015), “Investigation of Local Scour around Curved Groynesâ€, unpublished M.Sc. Thesis, Civil Department, Faculty of Engineering, University of Kufa, Iraq.

      [2] Attia, K., and El Saied, G., (2006), “The Hydraulic Performance of Oriented Spur Dike Implementation in Open Channelâ€, Journal of International Water Technology Conference, IWTC, Alexandria, Egypt, No.10, pp.281-298.

      [3] Dawood, A. M., (2013), “A study of Scour and Deposition around Groynesâ€, unpublished M.Sc. Thesis, Civil Department, Faculty of Engineering, University of Kufa, Iraq.

      [4] Ghoma, M., I., (2011), “The Effect of wall jet flow on local scour hole Developmentâ€, unpublished Ph.D. Thesis, School of Engineering Design and Technology, University of Bradford.

      [5] Heidarpour, M., Khodarahmi, Z., and Mousavi, S., F., (2003), “Control and reduction of local scour at bridge pier groups using slotâ€. Proceedings, XXX IAHR Congressâ€, Thessaloniki, Greece, August 24-29, 7 pages.

      [6] Jafari, B., and Masjedi, A., (2015), “The effect of slot on scouring around spur dike at 180 degree bendâ€, Journal of Advances in Environmental Biology, Vol. 9, No. 5, P.P. 215-219

      [7] Kang, J., Yeo, H., and Kim, S., (2011), “Experimental study on the flow characteristics around the refraction groyneâ€, Journal of Scientific Research Engineering, Vol.3, No.8, PP.842-850. Published Online August, 2011, available online: (http://www.SciRP.org/journal/eng).

      [8] Lagasse, P. F., and Richardson, E. V., (2001), “ASCE compendium of stream stability and bridge scour papersâ€, Journal of Hydraulic Engineering, ASCE, Vol.127, No.7, pp.531-533.

      [9] Raudkivi, A., J., and Ettema, R., (1983), “Clear-water scour at cylindrical piersâ€, Journal of Hydraulic Engineering, ASCE, Vol. 109, No. 3, P.P. 50-338.

      [10] Toro-Escobar, C., Voigt Jr, R., Melville, B., Chiew, M. and Parker, G., (1998), “Riprap performance at bridge piers under mobile-bed conditionsâ€, Transportation Research Record, No.1647, P.P. 27-23.

      [11] Zhang, H., and Nakagawa, H., (2008), “Scour around Spur Dyke: Recent Advances and Future Researchesâ€, Annuals of Disas. Prev. Res. Inst., Kyoto University, No.51 B, pp.633-652.

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  • How to Cite

    I. Khassaf, S., & A. Abbas, H. (2018). Study of the Local Scour Around L-Shape Groynes in Clear Water Conditions. International Journal of Engineering & Technology, 7(4.20), 271-276. https://doi.org/10.14419/ijet.v7i4.20.25938

    Received date: 2019-01-16

    Accepted date: 2019-01-16

    Published date: 2018-11-28