Modeling Dilution of Wastewater Outfalls in a Tidal Estuary

by William P. Fox, Parametrix Inc, Sumner, WA, USA,

Document Type: Proceeding Paper

Part of: Coastal Zone '87


Field studies and modeling have been conducted to assess initial dilution of wastewater outfalls in Puget Sound, a fjord-like estuary in the State of Washington. Recent numerical dilution models have been developed that account for a larger number of design and oceanographic variables than predecessors. New modeling techniques are presented that provide more comprehensive evaluations of outfall performance than conducted in the past. The impacts of variations in oceanographic properties and suggestions for field study design are also presented. The data collection and modeling techniques are applicable to any other tidally-influenced water body, and may be used by coastal engineers and managers in evaluating wastewater disposal alternatives.

Subject Headings: Field tests | Dilution | Wastewater management | Tides | Estuaries | Oceanography | Hydrologic models | Numerical models | Washington | United States

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