Vertical Diffusion in Small Stratified Lake: Data and Error Analysis
Publication: Journal of Hydraulic Engineering
Volume 117, Issue 10
Abstract
Water temperature profiles were measured at 2‐min intervals in a stratified temperate lake with a surface area of and a maximum depth of 10 m from May 7 to August 9, 1989. The data were used to calculate the vertical eddy diffusion coefficient in the hypolimnion. The depth is representative of a large number of lakes in the north central United States. was calculated over time intervals of 1 to 15 days and varied from to A numerical model was developed for heat conduction in the sediments, and heat flux between water and sediments was incorporated into the relationship from which eddy diffusivity was estimated. Heat flux between water and lake sediments, a term commonly neglected, was found to be important in the estimation. values were related to stratification stability as measured by the Brunt‐Vaisala frequency N using Welander's expression of the form Values of a were on the order of and b varied from −0.36 to −0.45 when was given in and N is in An error analysis was conducted and the effects of different choices of sampling intervals in time and depth on the eddy diffusivity estimates were evaluated. The longest time interval (15 days) and the smallest depth increment (1 m) used in this study were found to give the best estimation.
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Published In
Journal of Hydraulic Engineering
Volume 117 • Issue 10 • October 1991
Pages: 1352 - 1369
Copyright
Copyright © 1991 ASCE.
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Published online: Oct 1, 1991
Published in print: Oct 1991
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