Influence of Meandering on the Estimation of Velocity and Shear Velocity in Cobble-Bed Channels Academic Article uri icon

abstract

  • Field experiments carried out on five reaches of the meandering cobble-bed Beheshtabad River in central Iran showed that the position of the maximum velocity was independent of the relative submergence (h/ d50 less or more than 4) and relative curvature (R/W) (where h is the flow depth, d50 is the median diameter of sediment, R is the radius of curvature, and W is the river width). A new method, called the boundary-layer characteristic method, was employed for the determination of shear velocity. The shear velocity values estimated with this method were in agreement with those obtained using the parabolic law. The law of the wall was valid for low and high relative curvatures in the inner, outer, and central zones of the meandering reaches. However, this law was not suitable for determining the shear velocity for the relative submergence range of 2.7 < h/d50 < 9.6 due to its high sensitivity to near-bed velocities. Interestingly, it was possible to predict the flow velocity in meandering reaches using the Shields parameter. © 2009 ASCE.

author list (cited authors)

  • Afzalimehr, H., & Singh, V. P.

citation count

  • 7

publication date

  • October 2009