Many lakes and reservoirs develop a seasonal temperature stratification.
The thermal stratification is associated with a density stratification
which effectively controls convection and diffusion in the lake. The
most stable stratification conditions exist during the summer months when
lakes or reservoirs exhibit large thermal gradients. Asa result the water
quality of the lower layers may be reduced significantly for example
because dissolved oxygen is no longer replenished by surface aeration.
Zic, Kresimir; Stefan, Heinz G..
Lake Destratification by Air Bubble Columns.
St. Anthony Falls Hydraulic Laboratory.
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