scholarly journals The Effect of Discharge Depth on Contaminant Dispersion in Turbulent Open Channel Flow

1982 ◽  
Vol 35 (2) ◽  
pp. 107 ◽  
Author(s):  
Albert J Gabric
Keyword(s):  
Total Mass ◽  
Open Channel ◽  
Open Channel Flow ◽  
Finite Depth ◽  
Centre Of Mass ◽  
Contaminant Dispersion ◽  
Transport And Diffusion ◽  
Neutrally Buoyant ◽  
Analytical Expressions ◽  
And Diffusion

The transport and diffusion of neutrally buoyant, conservative contaminants in an open, finite depth channel is analysed at times before uniform mixing over the depth has occurred. Analytical expressions for the total mass at a given depth, the centre of mass and the variance of the contaminant patch are presented.

scholarly journals An open-channel flow meeting a barrier and forming one or two jets

2000 ◽  
Vol 41 (4) ◽  
pp. 458-472 ◽  
Author(s):  
L. H. Wiryanto ◽  
E. O. Tuck
Keyword(s):  
Free Surface ◽  
Open Channel ◽  
Vertical Wall ◽  
Open Channel Flow ◽  
Free Surface Flow ◽  
Integral Equation Method ◽  
Finite Depth ◽  
Surface Flow ◽  
Parameter Measuring ◽  
Two Jets

AbstractA steady two-dimensional free-surface flow in a channel of finite depth is considered. The channel ends abruptly with a barrier in the form of a vertical wall of finite height. Hence the stream, which is uniform far upstream, is forced to go upward and then falls under the effect of gravity. A configuration is examined where the rising stream splits into two jets, one falling backward and the other forward over the wall, in a fountain-like manner. The backward-going jet is assumed to be removed without disturbing the incident stream. This problem is solved numerically by an integral-equation method. Solutions are obtained for various values of a parameter measuring the fraction of the total incoming flux that goes into the forward jet. The limit where this fraction is one is also examined, the water then all passing over the wall, with a 120° corner stagnation point on the upper free surface.

MODELING THE ORGANIC REMOVAL AND OXYGEN CONSUMPTION BY BIOFILMS IN AN OPEN-CHANNEL FLOW

1994 ◽  
Vol 30 (2) ◽  
pp. 53-61 ◽  
Author(s):  
Shiyu Li ◽  
Guang Hao Chen
Keyword(s):  
Water Quality ◽  
Oxygen Consumption ◽  
River Water ◽  
Channel Flow ◽  
Diffusion Layer ◽  
Open Channel ◽  
Open Channel Flow ◽  
River Water Quality ◽  
Monod Kinetics ◽  
Organic Removal

A mathematical model is proposed to predict the removal of dissolved organic substances and the consumption of dissolved oxygen by attached biofilms in an open-channel flow. The model combines the biofilm equations with the conventional Streeter–Phelps type equations of river water quality by considering the mass transfer of organics and oxygen in the river water through the diffusion layer into the biofilm. It is assumed that the diffusion and reaction within the biofilm are of steady-state, and follow Monod kinetics. The model is solved numerically with a trial-and-error method. The simulation results of the model for an ideal case of river flow and biofilm show that the organic removal rate and oxygen consumption rate caused by the biofilm are greater than that by suspended biomass. The effects of diffusion layer thickness, flow velocity, and biofilm thickness on the change of river water quality are discussed.

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