APPLICATION OF STOCHASTIC MODEL OF SEDIMENT MOTION TO LOCAL SCOUR AROUND A BRIDGE PIER

Because of a complicated interaction between the flow and the sediment in time and space, a definite solution for the process of local scour around a bridge pier is not available to date. The experimental fact that scale and strength of a horseshoe vortex along the bottom surface scarcely change with development of the scour hole greatly simplifies the approach to this problem by giving attention to sediment motion in the stagnation plane where the maximum scour depth finally appears. The scouring force in this plane is evaluated by setting up a horseshoe vortex model represented by a circular motion. On the basis of stochastic consideration of sediment motion, the sediment transport rate on the stagnation plane is represented by the probability of movement of a particle per unit of time which is related to the absolute probability by a characteristic time. A model of the scouring process is formulated and verified by experimental data concerning the variation of the maximum scour depth in time.

  • Supplemental Notes:
    • Proceedings of the 16th Congress of the International Association for Hydraulic Research.
  • Corporate Authors:

    International Association for Hydraulic Research

    Room 61, Box 177
    Delft,   Netherlands 
  • Authors:
    • NAKAGAWA, H
    • Suzuki, K
  • Publication Date: 1975

Subject/Index Terms

Filing Info

  • Accession Number: 00139398
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Sep 16 1976 12:00AM