Journal Facts

Journal
Journal of Environmental Systems
ISSN
0047-2433 (print) 1541-3802 (electronic)
Volume
30
Issue
2
Date
10/1/2003

Article Facts

Title
SIMPLIFIED DEVELOPMENT OF OXYGEN SAG MODEL
DOI
10.2190/283A-2C4U-BBX7-2VKC
Authors
  • TRIEU LE
  • EMERALD M. ROIDER
  • DONALD DEAN ADRIAN
Pages
135-145
Online Date
09/21/2005

Article Links

SIMPLIFIED DEVELOPMENT OF OXYGEN SAG MODEL

TRIEU LE
EMERALD M. ROIDER
DONALD DEAN ADRIAN

DOI: 10.2190/283A-2C4U-BBX7-2VKC

Abstract

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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