Baywood Publishing Company
0047-2433
1541-3802
Journal of Environmental Systems
BWES
300323
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30
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Number 2/2003-2004
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10.2190/283A-2C4U-BBX7-2VKC
283A2C4UBBX72VKC
135
SIMPLIFIED DEVELOPMENT OF OXYGEN SAG MODEL
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283A2C4UBBX72VKC.pdf
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2
TRIEU
LE
EMERALD M.
ROIDER
DONALD DEAN
ADRIAN
Louisiana State University, Baton Rouge
A dissolved oxygen sag equation is developed by use of the Laplace transform and the convolution integral for a stream in which the biochemical oxygen demand (BOD) deoxygenation rate is described as a second-order reaction. The Laplace transform method simplifies the mathematical solution of the model equation by avoiding difficult-to-evaluate integrals. The dissolved oxygen sag equation incorporates exponential integral functions which are calculated by exact or approximate series. The time at which the minimum dissolved oxygen concentration occurs is calculated numerically. The dissolved oxygen sag model is applied using BOD data collected from Douglas Fir needles in stream water. The Douglas Fir needles had a small reaction rate constant which results in the stream being able to carry a BOD load without exhausting its dissolved oxygen supply. The model is useful in calculating Total Maximum Daily Loads (TMDL) of streams.
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