Madurasinghe, M. Arachchige Dananjaya creator Radok, Rainer Chairperson Suphat Vongvisessomjai Examination Committee Lohani, Bindu N. Examination Committee Government of Japan Scholarship Donor text series technical report th Bangkok Asian Institute of Technology 1982 continuing eng v, 17 p. This study investigates possible algorithms for the determination of eddy diffusivities in fluids and gases, employing naturally present periodic heating processes. These algorithms follow reasoning first developed by Angstrom in a study. of the determination · of diffusivities in metal bar.s. Angstrom's model involved only one dimensional bodies; this study extends these algorithms to higher dimensions. Seas of rectangular shapes are considered, where heating by the sun or tidal action are the mechanisms which cause periodic changes in the temperature. The solutions to the corresponding differential equations are obtained. At selected points, amplitudes and phase shifts of the temperature variations which are assumed to be available data for this research, are expressed in terms of the diffusivity coefficients. This leads to a system of transcendental equations with the diffusivities as unknowns. A thesis submitted in partial fulfilment of the requirement for the degree of Master of Science, School of Engineering and Technology Thesis (M.Sc.) - Asian Institute of Technology, 1982 Turbulent diffusion (Meteorology) Algorithms Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B21148 http://203.159.5.9/ait-thesis/detail.php?q=B21148 951012 20260817162117.0