Flow rates through Sturgeon Lake and backwater channels of the
Mississippi River in the vicinity of the Prairie Island Nuclear power
Generating Plant are determined as a function of total river flow and of
wind direction and wind velocity, particularly for low flow conditions.
The analysis is made in order to determine; (a) how much of the Sturgeon
Lake flow is drawn into the cooling water intake of the plant, and (b) by
how much plant effluent cooling water or blow down water is diluted by
sturgeon Lake effluent before entering the Mississippi River. A channel
network analysis including effects of wind stress on the water surface in
addition to bed shear stress and local (minor) energy losses was made to
provide the required information. Forty-three channel and channel segments
were used to describe the entire system. The Sturgeon Lake/North Lake
system was studied before the complete analysis was made. In the absence
of wind, flow through Sturgeon Lake amounted to about 22 percent of total
river flow. At low plant withdrawal rates and at zero wind, the flow
through the backwater channel in front of the plant outlet (channel 42)
was about 10 percent of total river flow. Winds from 5 to 30 mph had a very
noticeable effect on flows through Sturgeon Lake, particularly when total
river flows were less than 10,000 cfs. The analysis was made without consideration
of stratification effects near the plant intake and outlet.
Stefan, Heinz; Anderson, Keith.
Analysis of Flow through Sturgeon Lake and Backwater Channels of Mississippi River Pool No. 3 Near Red Wing, Minnesota.
St. Anthony Falls Hydraulic Laboratory.
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