Stable Channels with Mobile Bed: Model Verification and Graphical Solution

Abstract

A numerical model that uniquely determines the geometry and boundary stress distribution of a stable channel with mobile bed was discussed in a companion paper (Vigilar and Diplas, 1997). The difference between this model and previous stable channel models is that it consistently accounts for the phenomenon of momentum diffusion. In this paper, the model is tested against available experimental and field data. Results indicate that the model adequately predicts the bank shape and significant dimensions of stable channels. To make the findings of the model more amenable to the design engineer, equations and plots based on the model results are developed. These can be used to determine a channel's shape and significant dimensions, giving the practitioner an alternative to running the numerical model. As with the theory behind this model, the design equations and plots apply to straight, symmetrical channels with uniform cross sections and coarse, noncohesive boundaries. Sediment is assumed to be coarse enough that suspension is precluded and bank vegetation and secondary current effects are neglected.