03-12 - Announcements Prelim 1 review sessions in HO366:...

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Announcements • Prelim 1 review sessions in HO366: – Friday at 4pm – Monday at 5pm
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The net effect of dispersion is mass transfer to other fluid elements. This lowers the maximum concentration observed and changes reaction rates for non-conservative materials (Ex . BOD). [More on dispersion soon!] II. Other O 2 sources and sinks are neglected. Even if Q and A are constant (they aren't) and dispersion is negligible (it isn't) the model can get very messy if we include other sources and sinks of D.O.
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The general form of the equation we have used is: dC = -udC + r i where r i = reaction terms dt dX net mass in and out by transport So far, our reaction terms include reaeration and microbial assimilation of O 2 , but in general: r i = t , X S oxidation where = source or sink which is a function of distance and/or time. t , X S
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so S(x,t)= +k 2 D (X) [reaeration] -k 1 L (X) [BOD] ---------------------------------- -k' N C N1(X) [NOD] +P (X,t) [photosynthesis] -R (X) [algal respiration] -B (X) [benthic uptake] Covered, and in our model Covered, but currently not in our model Coming attractions! Acts like a non-point source of BOD PHOTOSYNTHESIS This is carried out by green plants and algae (single celled photosynthetic autotrophs) and bacteria.
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C 106 H 181 O 45 N 16 P + 150 O 2 106 CO 2 + 16 NO 3 - + PO 4 -3 +
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03-12 - Announcements Prelim 1 review sessions in HO366:...

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