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Abstract
A two‐layered dispersion model, suitable for application to partially‐mixed estuaries, has been developed to provide hydro‐logical interpretation of the results of biological sampling. The model includes horizontal and vertical advection plus both horizontal and vertical diffusion. A pseudo‐geostrophic method, which includes a damping factor to account for internal eddy friction, is used to estimate the horizontal advective fluxes and the results are compared with field observations. A salt balance model is then used to estimate the effective diffuslvities in the Potomac estuary during the Spring of 1974.