Original paper

Convective water exchanges in a wind-sheltered littoral region of Eau Galle Reservoir, Wisconsin USA

James, William F.; Barko, John W.

Archiv für Hydrobiologie Volume 145 Number 3 (1999), p. 373 - 383

16 references

published: Jun 28, 1999

DOI: 10.1127/archiv-hydrobiol/145/1999/373

BibTeX file

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Rates of convective water exchange were estimated for periods of differential cooling from a heat budget model, based on detailed changes in water temperature at stations positioned along the littoral slope of the macrophyte-occupied southwest embayment in Eau Galle Reservoir, Wisconsin. Differential cooling and convective water exchanges occurred nightly over a study period of 14 days in August, 1991. Although wind speeds were negligible during most of the nights, estimated rates of convective exchange (grand mean = 0.00066 m3 m-1 s-1) were sufficient to result in a residence time of only ∼ 1 day in this embayment. Rates of convective exchange calculated via a heat budget model in 1991 were very similar in magnitude to rates measured in 1989 in another embayment of Eau Galle Reservoir using dye as a tracer for water movement. Our results suggest that substantial horizontal water movements and solute transport can occur in the absence of wind in vegetated littoral regions of lakes.


littoralcoolingEau Galle ReservoirWisconsinUSA