A Unified Hydrodynamic-Water Quality Model

by Alan F. Blumberg, HydroQual Inc, Mahwah, NJ, USA,
Dominic M. Di Toro, HydroQual Inc, Mahwah, NJ, USA,
Rita E. Vassilakis, HydroQual Inc, Mahwah, NJ, USA,
Paul R. Paquin, HydroQual Inc, Mahwah, NJ, USA,
James J. Fitzpatrick, HydroQual Inc, Mahwah, NJ, USA,

Document Type: Proceeding Paper

Part of: Water Forum '86: World Water Issues in Evolution


To understand the cause-effect relationships controlling water quality in dynamically narrow estuaries, a time dependent branching, laterally averaged (longitudinal and vertical) hydrodynamic model was joined together with a similarly formulated water quality model. The governing equations consist of equations for continuity, temperature, conductivity (or salinity) and momentum conservation for channels of variable width and depth. A turbulence closure model is embedded within the circulation model to provide a parameterization of the turbulence mixing processes. The water quality component of the unified model consists of conservation equations for dissolved oxygen and biochemical oxygen demand, both of which are formulated to resolve the vertical and longitudinal directions. A simulation conducted with the model for an observationally well documented and interesting rainfall event in the Milwaukee Harbor estuary is described.

Subject Headings: Dissolved oxygen | Water quality | Biological processes | Combined sewers | Estuaries | Hydrodynamics | Oxygen demand

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