Lake Number, a quantitative indicator of mixing used to estimate changes in dissolved oxygen

International Review of Hydrobiology
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Abstract

Lake Number, LN, values are shown to be quantitative indicators of deep mixing in lakes and reservoirs that can be used to estimate changes in deep water dissolved oxygen (DO) concentrations. LN is a dimensionless parameter defined as the ratio of the moments about the center of volume of the water body, of the stabilizing force of gravity associated with density stratification to the destabilizing forces supplied by wind, cooling, inflow, outflow, and other artificial mixing devices. To demonstrate the universality of this parameter, LN values are used to describe the extent of deep mixing and are compared with changes in DO concentrations in three reservoirs in Australia and four lakes in the U.S.A., which vary in productivity and mixing regimes. A simple model is developed which relates changes in LN values, i.e., the extent of mixing, to changes in near bottom DO concentrations. After calibrating the model for a specific system, it is possible to use real-time LN values, calculated using water temperature profiles and surface wind velocities, to estimate changes in DO concentrations (assuming unchanged trophic conditions).

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Lake Number, a quantitative indicator of mixing used to estimate changes in dissolved oxygen
Series title International Review of Hydrobiology
DOI 10.1002/iroh.19940790202
Volume 79
Issue 2
Year Published 1994
Language English
Publisher Wiley
Contributing office(s) Wisconsin Water Science Center
Description 18 p.
First page 159
Last page 176
Country Australia, United States
State Wisconsin
Other Geospatial Crystal Lake, Darwin River Resevoir, Lake Mendota, Trout Lake, Warragamba Resevoir, Woronora Resevoir
Online Only (Y/N) N
Additional Online Files (Y/N) N