Three-dimensional numerical simulation of solute transport in a meandering self-formed river channel
Wilson, C. A. M. E., Guymer, I., Boxall, J. B. and Olsen, N. R. B.. (2007) Three-dimensional numerical simulation of solute transport in a meandering self-formed river channel. Journal of Hydraulic Research, Vol.45 (No.5). pp. 610-616. ISSN 0022-1686Full text not available from this repository.
Official URL: http://dx.doi.org/10.1080/00221686.2007.9521797
A three-dimensional (3-D) numerical model with standard k-epsilon,turbulence closure has been applied to model the transport and mixing of solute in a larae-scale laboratory channel. The channel is meandering with self-formed cross-sectional shape. Simulation accuracy was evaluated through comparison of computed and measured temporal concentration curves downstream of a pulse injection from a transverse line source. This study shows that the transport and mixing of solute in a meandering channel with a physically realistic bathymetry can be simulated accurately with a 3-D numerical model using k-epsilon turbulence closure. The prediction accuracy of the temporal concentration curves using different time steps, numerical schemes and Schmidt numbers are presented. The performance was evaluated in terms of a goodness of fit, computed peak concentration and gradients of the rising and falling limbs. The second order upwind scheme for the advective term in the solution of the advection-diffusion equation was found to give a considerably better prediction of the temporal concentration curve than the power law scheme. A value of unity for the turbulent Schmidt number results in a slightly early arrival time of the peak in tracer concentration, reducing the value of Schmidt number to 0.5 was found to result in a more accurate prediction.
|Item Type:||Journal Article|
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TC Hydraulic engineering. Ocean engineering
|Divisions:||Faculty of Science > Engineering|
|Journal or Publication Title:||Journal of Hydraulic Research|
|Publisher:||Taylor & Francis Ltd.|
|Number of Pages:||7|
|Page Range:||pp. 610-616|
|Access rights to Published version:||Restricted or Subscription Access|
|Funder:||Engineering and Physical Science Research Council (EPSRC)|
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