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Expert System for Hydrodynamic Mixing Zone Analysis of Conventional and Toxic Submerged Single Port Discharges (CORMIX1)

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Technical Report

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Cornell University Ithaca United States

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U S water quality policy includes the concept of a mixing zone, a limited area or volume of water where the initial dilution of a discharge occurs. The CornellMixing Zone Expert System C0RMIX1 was developed to predict the dilution and tra jectory of a submerged single port discharge of arbitrary density positive, neutral, or negative into a stratified or uniform density ambient environment with or without crossflow. C0RMIX1 uses knowledge and inference rules based on hydrodynamic expertise to classify and predict buoyant jet missing. C0RMIX1 gathers the necessary data, checks for data consistency, assembles and executes the appropriate hydrodynamic simulation models, interprets the results of the simulation in terms of the legal requirements including toxic discharge criteria, and suggests design alternatives to improve dilution characteristics. The model, with its emphasis on rapid initial mixing, assumes a conservative pollutant discharge neglecting any physical, chemical, or biological reaction or decay process. The predictive results can be readily converted, however, to adjust for first-order reaction processes. The results of the hydrodynamic simulation are in good agreement with field and laboratory data. Inparticular, C0RMIX1 correctly predicts highly complex discharge situations involving boundary interactions, dynamic bottom attachments, internal layer formation, and buoyant intrusions.

Subject Categories:

  • Fluid Mechanics

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