Boundary Shear Distribution In Smooth And Rough Open Channels
As boundary shear stress is an important parameter in open flow so experiments have been conducted in smooth
and rough open channels and some experiments have been considered from different literatures for examining it’s variation
with geometric, hydraulic and roughness parameters. These experimental channels comprising of trapezoidal and rectangular
main channel and two symmetrically disposed flood plains. The local shear stress and boundary shear stress distribution
cannot be determined easily as they depend upon the velocity field, the shape of the cross section and the boundary
roughness. Variation of shear on flood plain and main channel with respect to the width ratio, relative flow depth and
roughness has been demonstrated. A comparison between boundary shear stress distributions in smooth and rough
compound channels has been made. Certain not worthy differences have been seen in both the channels due to account of
secondary flow structure. The results provide a brief idea which will be useful for successfully knowing the distribution of
boundary shear stress when the geometric, hydraulic and roughness parameters of simple and compound channels change.
Keywords— Boundary shear stress, Smooth and Rough compound channel, Local shear stress, Velocity field, Width ratio.