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of Dissertation Presented to the Graduate Council of the University of Florida in Partial Fulfillment of the Requirements for the "Degree of Doctor of Philosophy DETERMINATION OF VERTICAL TURBULENT DIFFUSIVITIES OF HEAT IN A NORTH FLORIDA LAKE '..'' ^^ Jerry A. Steinberg August 13, 1975 Chairman: Wayne C. Huber Major Department: Environmental Engineering Sciences Knowing or predicting the distribution of water quality parameters in water bodies is essential to efficient management of water as a valuable natural resource. Theoretical concepts which describe the transport of substances throughout the water have been developed, and the effects of turbulence have been accounted for by the semiempirical approach of relating turbulent diffusive flux to the average gradient of concentration through coefficients of diffusivity. Because of the significance of vertical temperature distributions in lakes and reservoirs, this research has focused on evaluating vertical diffusivities of heat in a deep Florida lake. A complex data acquisition system was designed, built, and installed at Lake Mize, Florida, to gather field data to be used to evaluate diffusivities. The investigation (involved measuring both the actual turbulent motion responsible for the transport, and the change in heat content as a result of the motion. Emphasis was also given to making

Determination of vertical turbulent diffusivities of heat in a North Florida lake / by Jerry A. Steinberg.