Detailed description of a model of assessing technical alternatives in the management of fluid waste discharges in well mixed estuaries and coastal areas. A model is developed from the numerical integration of (1) flow equations that simulate the water movements of tides and (2) the advective diffusion equation representing the movement of dissolved waste constituents. Partial differential equations that formulate the two-dimensional movement of waste constituents are approximated by two difference equations; these equations are used in succession for a step-by-step solution in time. Computational procedures are tested on models of Jamaica Bay, Long Island, New York. A model with a computational grid size of 500 ft was used for the computation of tide levels and velocities in this shallow bay with many tidal flats.
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