TURBULENT MIXING IN UNIFORM CHANNELS OF IRREGULAR CROSS-SECTION

A new method is presented for modelling three-dimensional turbulent di spersion problems in.open channels with an arbitrary, but uniform, cro ss-section. The semi-analytical technique is applicable when investiga ting the steady discharge of effluent into a channel which has distrib utions of longitudinal velocity and turbulent diffusivities specified over its cross-section. Implementation of the method is discussed, alo ng with an example illustrative of the effects of three-dimensional mi xing. Predictions are also compared with the experimental results of W ood and Liang (1989) for mixing in a flood-plain/main channel geometry .