文档介绍：Advances in Environmental Research 4Ž. 2000 287᎐294
Transverse mixing coefficient measurements in an open
rectangular channel
. ChauU
Department of Ci¨il & Structural Engineering, Hong Kong Polytechnic Uni¨ersity, Hunghom, Kowloon, Hong Kong
Accepted 2 June 2000
Abstract
Experiments were carried out to investigate the transverse mixing coefficients in an open rectangular channel
under different flow and bottom roughness conditions. Dye was continuously injected into the open channel flow at
the 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 velocity and
flow depth was developed for four bed types. In agreement with the work of other researchers, the present work
shows that the transverse mixing coefficients vary with the product of the shear velocity and flow depth. It was
concluded from this study that the dimensionless transverse mixing coefficient remains virtually unchanged under
different bottom roughness conditions. ᮊ 2000 Elsevier Science Ltd. All rights reserved.
Keywords: Mixing; Dispersion; Channel flow
1. Introduction governed by the transverse mixing coefficient, which
usually includes both transverse eddy diffusion and
transverse dispersion. Transverse eddy diffusion is the
When