Application of a Boundary Fitted Coordinate Mass Transport Model

by Daniel L. Mendelsohn, Applied Science Associates, Inc, Narragansett, United States,
J. Craig Swanson, Applied Science Associates, Inc, Narragansett, United States,

Document Type: Proceeding Paper

Part of: Estuarine and Coastal Modeling


A three-dimensional, boundary fitted coordinate, finite difference, mass transport model was applied to the Providence River in Upper Narragansett Bay, Rhode Island. The governing advection-diffusion equation was solved on a space centered grid format using an implicit trapezoidal time differencing scheme. The modeling study analyzed receiving water quality for a portion of the Providence combined sewer overflow (CSO) system, in response to fecal coliform (FC) loading. Tidal and river currents and surface elevation data were calculated using the complementary boundary fitted coordinate hydrodynamic model. Model sensitivity to dispersion coefficients and FC decay rate was evaluated using dry weather FC concentration data. Model predicted FC concentration time series and maxima were calibrated to field observations at seven stations for a May 1989 storm event. Mitigation efforts were then assessed for a series of design storms based on return frequency.

Subject Headings: Three-dimensional models | Domain boundary | Mass transport | Rivers and streams | Water quality | Sensitivity analysis | Combined sewers | Tides | Rhode Island | United States

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