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The vertical mixing parameterization was the level 2.5 turbulence closure scheme of Mellor and Yamada (1982) with the extensions by Galperin et al (1988). An important feature of these extensions include a length-scale limitation that prevents the mixing length from becoming too large during strongly stratified conditions. The minimum ``background mixing'' value, below which the eddy viscosity never falls, was set to m s . This value is comparable to the value of vertical mixing observed by Geyer and Ledwell (1994) from a dye experiment near the future outfall site.