First Advisor

Roy W. Koch

Term of Graduation

Summer 1986

Date of Publication

6-20-1986

Document Type

Thesis

Degree Name

Master of Science in Civil Engineering (MSCE)

Department

Civil Engineering

Language

English

Subjects

McKenzie River (Or.) -- Temperature

DOI

10.15760/etd.5494

Physical Description

1 online resource (2, xi, 96 pages)

Abstract

A one dimensional, steady flow, unsteady temperature model is used to evaluate the effects of two U.S. Army Corps of Engineers (COE) dams and resulting reservoirs on hourly water temperatures of the mainstem McKenzie River from Delta Park (RM 62.1) to Leaburg Dam (RM 38.8). Both COE projects are on tributaries to the McKenzie River and at present have only bottom withdrawl capabilities.

Water temperatures were simulated using the equilibrium temperature approach with air temperature used to estimate equilibrium temperature and also using computed hourly equilibrium temperature. Results obtained using computed equilibrium temperatures were less satisfactory than results using air temperature to estimate equilibrium temperature. The much larger diel fluctuation of hourly equilibrium temperature as compared to air temperature accounts for this apparent contradiction.

A heat exchange parameter, HEP, was introduced during calibration to account for the additional surface area of a stream effectively available for heat transfer created by a multitude of riffles. Use of this parameter improved model results by increasing simulated daily maximums and diel fluctuations. Calibration produced a HEP value of 2.5 for the McKenzie River.

The model had a mean accuracy of near zero with a mean absolute deviation (MAD) of less than 0.4 °C at Finn Rock (RM 54.2). A mean error of 0.6 °C and MAD of over 0.6 °C at Leaburg Darn (RM 38.8) indicates that accuracy decreased downstream from Finn Rock.

COE reservoir effects were examined for a one week period in each of the months of July, August, and September, 1984. COE reservoirs had a cooling effect at Finn Rock during all three periods. Cooling effects were found at Leaburg Darn during August and September with no effects found in July. The overall result of COE reservoirs during these periods was a decrease in mean water temperature and a decrease in diel fluctuation at Finn Rock, but an increase in diel fluctuation at Leaburg Darn.

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Comments

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Persistent Identifier

http://archives.pdx.edu/ds/psu/20566

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