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
published: Jun 28, 1999
ArtNo. ESP141014503010, Price: 29.00 €
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.