Theses and Dissertations


Title: A procedure for detection of flow-dispersion patterns on a large impoundment

Name: Bayne, David Roberge

Degree: MS

Chair: Dr. John M. Lawrence

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1967

Pages: 75

Keywords: Flow-Dispersion Patterns,Impoundment.

Abstract:

To better understand the fate of soluble contaminants introduced into the 45,000 acre Walter F. George Reservoir (Lake Eufaula) and other similar bodies of water, a flow-dispersion study was carried out in this reservoir during the low water months of August and September, 1966. Observations of movement and dispersion of the reservoir waters were made by introducing Rhodamine WT dye and detecting its concentration by means of a fluorometer at selected sites along the path of movement. The study revealed that in the upper reaches of the reservoir between Fort Benning Bridge, mile 141, and Florence Landing, mile 113, the water movement was distinctly river-like. The flow was constant with an average velocity of approximately 0.3 mile per hour. Complete lateral and vertical dispersion was characteristic of this reach. Turbulence produced in the vicinity of bridge piers had a definite effect upon the mixing of waters in this reach. A dredged navigation canal constructed through a narrow land strip separating the arms of a two-mile horseshoe bend in the River Bend Park area, mile 131, did not impede the movement of the dye along the old river channel. Dye moved along both channels with no evidence of stagnation. Movement of bottom waters confined to the old river bed in the reach from White Oak Creek, mile 88, to the dam, mile 75, was constant at an average speed of approximately 0.1 mile per hour. Lateral dispersion of the dye was complete within the bounds of the old river bed, but there was virtually no vertical dispersion since the waters were thermally stratified in this reach. Bottom waters injected with dye just below the railroad bridge at Eufaula, Alabama, mile 95, behaved erratically. The dye cloud moved upstream for a distance of 2.5 miles. The constriction of the reservoir, due to the parallel earthen causeways and strong surface currents in the reach, could have influenced this upstream flow of bottom water. Lateral dispersion of this dye cloud was complete and vertical dispersion was greater, probably due to more turbulence in the vicinity. Strong easterly winds and cool temperatures in mid-September caused the reservoir waters to "overturn." Observations made during this period revealed that oxygenated, warmer, dyed waters were being forced beneath the oxygen-depleted, colder, dyeless waters, displacing the bottom waters upward. The overturn occurred even though there was a 1.5oC. difference in the water temperature from top to bottom.

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