Transverse mixing coefficient measurements in an open rectangular channel

Experiments were carried out to investigate the transverse mixing coefficie nts in an open rectangular channel under different flow and bottom roughnes s conditions. Dye was continuously injected into the open channel flow at t he centre and the side of the channel. The dye concentrations at different downstream distances from the point of injection were measured. Correlation of the transverse mixing coefficients with the product of the shear veloci ty and flow depth was developed for four bed types. In agreement with the w ork of other researchers, the present work shows that the transverse mixing coefficients vary with the product of the shear velocity and flow depth. I t was concluded from this study that the dimensionless transverse mixing co efficient remains virtually unchanged under different bottom roughness cond itions. (C) 2000 Elsevier Science Ltd. All rights reserved.