Topic 1-5 Governing eqn, Tuulance, Op...ass transport OCF, stratified flow.pdf

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Ans 1:  Given – Blackwood River has significant problem with Anoxia- low level of dissolved oxygen-DO. 
The competing effects of DO consumption by phytoplankton respiration and atmospheric reaeration causes vertical gradients in oxygen concentration. 
Saturated DO concentration at surface due to reaeration is 10mg/L
Depth of river 1.5m, river slope 1/1000 and there is no flux boundary for DO
To find:  Governing equation for vertical concentration profile of DO in stretch of river
Solution: Under the conditions of steady state flow and unidirectional mass transfer (in y direction) with no chemical reaction in the river, the transfer of oxygen will be:

Please find attached file. The subject name is Environmental Fluid Mechanics , Topic is Open channel flow.

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