Modeling Impact of Storage Zones on Stream Dissolved Oxygen
Publication: Journal of Environmental Engineering
Volume 125, Issue 5
Abstract
The Streeter-Phelps dissolved oxygen model is modified to incorporate storage zones. A dimensionless number reflecting enhanced decomposition caused by the increased residence time of the biochemical oxygen demand in the storage zone parameterizes the impact. This result provides a partial explanation for the high decomposition rates observed in shallow streams. An application suggests that the storage zone increases the critical oxygen deficit and moves it closer to the point source. It also indicates that the storage zone should have lower oxygen concentration than the main channel. An analysis of a dimensionless enhancement factor indicates that the biochemical oxygen demand decomposition in small streams could be up to two to three times more than anticipated based on the standard Streeter-Phelps model without storage zones. For larger rivers, enhancements of up to 1.5 could occur.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 125 • Issue 5 • May 1999
Pages: 415 - 419
History
Received: Aug 18, 1998
Published online: May 1, 1999
Published in print: May 1999
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