Near Field Modeling

by Philip J. W. Roberts,

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


Results of near field modeling of the wastefield formed by the Sand Island, Honolulu, ocean sewage outfall are presented. Over 20,000 simulations were run with the mathematical model RSB using as input data long time series of effluent flowrate and oceanographic observations over the whole water column including currents measured by Acoustic Doppler Current Profilers (ADCP's), and density stratification measured by thermistor strings. It was found that considerable variability in plume behavior occurs, on a range of time scales down to a few hours. On an annual basis, the wastefleld is predicted to be submerged, usually deeply, about 88% of the time, although considerable seasonal variability in plume behavior is predicted. It is demonstrated that the use of these recently developed instruments combined with appropriate mathematical models can lead to greatly improved predictions of the statistical characteristics of wastefield behavior in coastal waters than has been previously possible.

Subject Headings: Mathematical models | Simulation models | Plumes | Mathematics | Waste management | Ocean currents | Effluents | Hawaii | United States | Honolulu

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