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Describes the computational principles of simulating three-dimensional flows in estuaries, bays, and coastal seas in which nonisotropic density conditions may exist. Numerical integration of the finite difference equations for motion, continuity, and for the transport of salt and heat are used. With this model, the computed salinity and temperature distributions are coupled to the flow computation by a nonlinear equation of state. An approximation for the sub-gridscale effect is introduced by use of mass heat and momentum exchange coefficients. The vertical exchanges for stable or unstable vertical stratification are estimated according to the local Richardson number.

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