Analysis of Waterbody Surface Heat Exchange

by Nuh-Chao Huang, J.E. Edinger Associates, Inc, Wayne, United States,
Ralph R. Rumer, Jr., J.E. Edinger Associates, Inc, Wayne, United States,



Document Type: Proceeding Paper

Part of: Cold Regions Engineering

Abstract: The Edinger-Duttweiler-Geyer (EDG) approach for estimating heat exchange at a water surface was examined and its applicability to ice-covered waterbodies determined. The EDG linearized equation was reformulated using a Taylor series expansion and analyzed, leading to new expressions for the equilibrium temperature and the heat exchange coefficients. Computations based on the developed model were carried out using available analytical and empirical expressions for the various heat exchange components. An improved expression for the so-called wind speed function has been employed that incorporates the dependency of this function on the aerodynamic stability of the air column above the lake surface as well as the water or ice surface roughness. Based on comparison with the original EDG approach and experimental data, a linearized version of the model gave good approximations of surface heat exchange except when the difference between the computed equilibrium temperature and the lake surface temperature was large. When this temperature difference is large, an expanded nonlinear version of the model is required to produce accurate estimates of surface heat exchange.

Subject Headings: Hydraulic roughness | Temperature effects | Ice | Wind speed | Water surface | Equilibrium | Computer models | Lakes

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