Pressure fluctuations within subsurface gravel bed caused by turbulent open-channel flow

2004 ◽  
pp. 695-701 ◽  
Author(s):  
M Detert ◽  
G Jirka ◽  
M Jehle ◽  
M Klar ◽  
B Jähne ◽  
...  
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Pressure Fluctuations ◽  
Open Channel Flow ◽  
Gravel Bed

Outer Scaling for Open Channel Flow over a Gravel Bed

2011 ◽  
Vol 137 (1) ◽  
pp. 40-46 ◽  
Author(s):  
Brian J. Belcher ◽  
James F. Fox
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Gravel Bed

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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