Information on seasonal water temperature cycles and temperature stratification in
ten large lakes in Minnesota has been obtained by numerical simulation(Gao and Stefan,
1997). The ten lakes are Mille Lacs Lake, Red Lake, Lake of the Woods, Leech Lake,
Lake Vermilion, Lake Kabetogama, Lake Winnibigoshish, Lake Pepin, Rainy Lake and
Cass Lake. The lakes have surface areas of 63 to 3846 km2 and maximum depths from 6
m to 49 m. To do this study, a one-dimensional, unsteady, year-round, process-oriented
model, MINLAKE 96, was used.
All lakes were simulated for the period from 1983 to 1990 except Mille Lacs Lake
which was simulated from 1980 to 1990 in order to compare the simulation results with
field data in 1981.
In the report by Gao ,:nd Stefan (1997), simulation results for the year 1990 were
presented. Simulation results for all simulation years (1983 - 1990) have been assembled in
this external memorandum. They include
• isotherms interpolated from simulated daily water temperature profiles,
• tables for mean weekly water temperatures, and maximum and minimum daily
water temperatures in each week at 1 m above the deepest point of the lakes,
• figures for mean weekly water temperatures, and weekly maximum and
minimum daily water temperatures in each week at 1 m above the deepest
point of the lakes,
• tables for mean annual water temperatures, plus/minus one standard deviation
of daily values at 1 m above the deepest point of the lakes,
• figures for mean annual water temperatures, plus/minus one standard deviation
of daily values at 1 m above the deepest point of the lakes.
The results are assembled in the same order for each lake and without figure titles.
Labels on each figure identify the information presented.
U.S. Environmental Protection Agency
Office of Research and Development; Minnesota Department of Natural Resources
Gao, Shaobai; Stefan, Heinz G..
Simulated Seasonal Water Temperature Cycles and Stratification in Large Lakes in Minnesota: Addendum to Project Report No. 410.
St. Anthony Falls Laboratory.
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