Soren Peter Kjeldsen


A mathematical method and a computer algorithm is developed for the case of one-dimensional vertical mixing for an estuary with rather small advection. In the case under consideration varies the diffusion coefficients both with time and depth, and the case is therefore closer to actual estuaries than earlier computing methods that applies constant coefficients. Model experiments with a small grid oscilliating with high frequencies in two fluids with different densities were performed to test the algorithm. Reynolds number for turbulence was near 1.6-101'. The results showed that the ratio between the stabilizing Brunt-Vaisala frequency and the agitating cyclic frequency was a governing parameter for the system, and dimensionless. diffusion coefficients could be expressed as a function of this parameter.


algorithm; vertical diffusion; diffusion

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