Research Article
Jan 1975
Temperature Dynamics in Dimictic Lakes
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VIEW THE REPLYAuthors: Heinz Stefan and Dennis E. FordAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 101, Issue 1
Abstract
Daily water temperature profiles in temperature lakes are predicted from time-variable meteorological conditions and lake morphology. A total energy concept which includes wind energy is used. The method of analysis is derived and illustrated through case studies. Agreement of predicted and measured water temperatures in two lakes throughout the summer season is good. The prediction of daily water temperature distributions in temperate lakes under the effect of variable meteorologic conditions throughout a season is possible using the total energy concept. Heat energy input (or output) into a lake includes shortwave (solar) radiation, long wave (atmospheric) radiation, back radiation, evaporation, and convection. Mechanical energy input is by wind. Although energy inputs and losses are computed separately, step by step, the method of analysis recognizes and incorporates the mutual interdependence (feedback) between different forms of energy input. In the sample computations conducted, the sequence was found to be irrelevant if a time step of 1 day was used.
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Published In
Journal of the Hydraulics Division
Volume 101 • Issue 1 • January 1975
Pages: 97 - 114
Copyright
© 1975 American Society of Civil Engineers.
History
Published in print: Jan 1975
Published online: Feb 3, 2021
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Authors
Affiliations
Heinz Stefan
Assoc. Prof., Dept. of Civ. and Mineral Engrg., St. Anthony Falls Hydraulic Lab., Univ. of Minnesota, Minneapolis, Minn.
Dennis E. Ford
Grad. Student, Dept. of Civ. and Mineral Engrg., Univ. of Minnesota, Minneapolis, Minn.
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