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Chapter
Apr 26, 2012

Dissolved Oxygen Modeling of Lake Ogallala: A Midwest Hydropower Tailwater Reservoir Using CE-QUAL-W2, Version 3

Publication: World Environmental and Water Resource Congress 2006: Examining the Confluence of Environmental and Water Concerns

Abstract

The Lake Ogallala hydropower tailwater reservoir is subjected to wide fluctuations of the inflow water quality and quantity. These alterations impact lake temperatures, water stage, dissolved oxygen (DO) and nutrients. A two dimensional continuous simulation, hydrodynamic and water quality model, CE-QUAL-W2, was used to simulate the lake's dissolved oxygen. The elements modeled include surges of low DO and temperatures; high chemical oxygen demands and dissolved nutrients; in-lake algae, macrophytes, and epiphytes response; temperature and bathymetric induced circulation patterns; and weather impacts. The epiphyte routine was used to simulate macrophytes, and the model was able to emulate the diurnal DO and temperature fluctuations which ranged from 2 to 12 mg/L and 19.5 to 23 degrees C, respectively. The study found that the chemical demand resulted in an approximately 1.5 mg/L drop in DO across the lake but also found that macrophyte respiration causes approximately a 2 mg/L reduction in DO during dark respiration. Management alternatives were modeled based on controlling the inflow of DO and macrophyte harvesting.

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Go to World Environmental and Water Resource Congress 2006
World Environmental and Water Resource Congress 2006: Examining the Confluence of Environmental and Water Concerns
Pages: 1 - 10

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Published online: Apr 26, 2012

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Terracon Consultants, Inc., 2211 South 156th Circle, Omaha, NE 68130. E-mail: [email protected]
J. Stansbury [email protected]
University of Nebraska-Lincoln, Department of Civil Engineering, 1110 S. 67th St., Omaha, NE 68182. E-mail: [email protected]
Olsson Associates, 2120 S. 72nd St. Omaha, NE 68124. E-mail: [email protected]
D. Admiraal [email protected]
University of Nebraska-Lincoln, Department of Civil Engineering, W348 NE Hall, Lincoln, NE 68588. E-mail: [email protected]

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