Temperature Dynamics in Dimictic Lakes

by 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.,

Serial Information: Journal of the Hydraulics Division, 1975, Vol. 101, Issue 1, Pg. 97-114

Document Type: Journal Paper


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.

Subject Headings: Wind power | Water temperature | Solar radiation | Temperature effects | Lakes | Meteorology | Case studies | Seasonal variations

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