EFFECT OF RELATIVE STEP HEIGHTS ON VELOCITY CHARACTERISTICS AND LOCAL SKIN FRICTION FOR NONAERATED SKIMMING FLOWS IN STEPPED CHANNELS

Abstract

 For the nonaerated skimming flows in the stepped channels, an experimental equation of the local skin friction coefficient is proposed with the effect of the relative step heights under a given the channel angle. The relation between the velocity distribution and the local skin friction for the nonaerated skimming flows is shown. For a wide range of the relative step heights, the analytical method for calculating the water depth and the boundary layer thickness is developed with experimentally obtained the local skin friction, determining the position of the section where the boundary layer thickness is equal to the water depth.