On the effect of cross sectional shape on incipient motion and deposition of sediments in fixed bed channels

Open access


The condition of incipient motion and deposition are of the essential issues for the study of sediment transport. This phenomenon is of great importance to hydraulic engineers for designing sewers, drainage, as well as other rigid boundary channels. This is a study carried out with the objectives of describing the effect of cross-sectional shape on incipient motion and deposition of particles in rigid boundary channels. In this research work, the experimental data given by Loveless (1992) and Mohammadi (2005) are used. On the basis of the critical velocity approach, a new incipient motion equation for a V-shaped bottom channel and incipient deposition of sediment particles equations for rigid boundary channels having circular, rectangular, and U-shaped cross sections are obtained. New equations were compared to the other incipient motion equations. The result shows that the cross-sectional shape is an important factor for defining the minimum velocity for no-deposit particles. This study also distinguishes incipient motion of particles from incipient deposition for particles. The results may be useful for designing fixed bed channels with a limited deposition condition.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • Ab Ghani A. Salem A.M. Abdullah R. Yahya A.S. Zakaria N.A. 1999. Incipient motion of sediment particles over loose deposited beds in a rigid rectangular channel. School of Civil Engineering University of Science 31750 Tronoh Malaysia.

  • Ackers P. White W.R. 1973. Sediment transport: new approach and analysis. J. Hydraulic Div. ASCE 99 HY11 November.

  • Ashley R.M. Bertrand-Krajewski J.L. Hvitved-Jacobsen T. Verbank M. 2004. Solids in sewers - characteristics effects and control of sewer solids and associated pollutants. IWA Publishing London.

  • Banasiak R. Verhoven R. De Sutter R. Tait S. 2005. The erosion behaviour of biologically active sewer sediment deposits: Observation from laboratory study. Water Res. 39 5221─5231.

  • Bogardi J.L. 1968. Incipient sediment motion in terms of critical mean velocity. Acta Technical Academia Scientarium Hungarica Budapest 62 1─2 1─24.

  • Butler D. May R.W.P. Ackers J.C. 1996a. Sediment transport in sewers. Part 1: background. Proc. Inst. Civ. Engrs. Wat. Marit. & Energy paper 10956 June.

  • Butler D. May R.W.P. Ackers J.C. 1996b. Sediment transport in sewers. Part 2: Design. Proc. Inst. Civ. Engrs. Wat. Marit. & Energy paper 10957 June.

  • Craven J.P. 1953. The transportation of sand in part-full pipe flows. Proceedings the Fifth Hydraulics Conference Bulletin 34. State University of Iowa Studies in Engineering Iowa State University Iowa.

  • El-Zaemey A.K.S. 1991. Sediment transport over deposited beds in sewers. PhD Thesis Department of Civil Engineering University of Newcastle Upon Tyne England.

  • Garde R.J. Ranga Raju K.G. 1985. Mechanics of sediment transportation and alluvial stream problems. Wiley Eastern Limited New Delhi India.

  • Ippen A.T. Verma R.P. 1953. The motion of discrete particles along the bed of a turbulent stream. Proceedings of Minnesota International Convention Minneapolis Minnesota.

  • Loveless J.H. 1992. Sediment transport in rigid boundary channels with particular reference to the condition of incipient deposition. PhD Thesis University of London.

  • Mayerle R. 1988. Sediment transport in rigid boundary channels. PhD Thesis Department of Civil Engineering University of Newcastle Upon Tyne England.

  • Mohammadi M. Knight D.W. 1999. Threshold for sediment motion in V-shaped channel. Proceedings XXVIII IHAR Congress 22-27 August Graz Austria.

  • Mohammadi M. 2005. The initiation of sediment motion in fixed bed channels. Iranian Journal of Science & Technology 29 B3 Shiraz University Shiraz Iran.

  • Neill C.R. 1968. A re-examination of the beginning of movement for coarse granular bed materials. Report INT 68 Hydraulics Research Station Wallingford England.

  • Novak P. Nalluri C. 1975. Sediment transport in smooth fixed bed channels. J. Hydraulics Div. ASCE 101 HY9.

  • Novak P. Nalluri C. 1984. Incipient motion of sediment particles over fixed beds. J. Hydraul. Res. IHAR 22 3 181-197.

  • Ojo S.I.A. 1980. Incipient motion of grouped particles on fixed beds. Symposium on River Eng. and its Interaction with Hydrological and Hydraulic Research IAHR Yugoslavia.

  • Shields A. 1936. Anwendung der anelichkeismechanik und der turbulenze forschung auf die geschiebebewegung (Application of similarity principles and turbulence research to bed load movement). Mitteilungen 26 preussischen versuchsanstalt fur wasserbau and schiffbau Berlin (Translated to English by W.P. Ott and Uchelen California Institution of Technology Pasadena CA.

  • Task Force Committee 1966. Sediment transportation mechanics: Incipient of motion. ASCE HY2 March.

  • Yalin M.S. 1992. River Mechanics Pergamon Press Oxford England.

Journal information
Impact Factor

IMPACT FACTOR 2018: 2.023
5-year IMPACT FACTOR: 2.048

CiteScore 2018: 2.07

SCImago Journal Rank (SJR) 2018: 0.713
Source Normalized Impact per Paper (SNIP) 2018: 1.228

Cited By
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 143 71 1
PDF Downloads 93 64 3