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Greg Pelletier

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Papers by Greg Pelletier

Journal of Environmental Engineering, 2015

Since its introduction in the 1970s as a valid and useful approach to simulating free flows, vari... more Since its introduction in the 1970s as a valid and useful approach to simulating free flows, various mathematical implementations of Lagrangian plume models were developed and verified, both for atmospheric and aquatic discharges. Valid for both jets and plumes, some of these models, including the Visual Plumes UM3 and JETLAG models, are widely used to predict or assess the dispersion performance of outfall structures, or diffusers. In addition to dilution, they also predict trajectories, rise, plume merging, and other properties and behaviors. The success of the Lagrangian plume models was attributed, at least partially, to the projected area entrainment (PAE) hypothesis. The PAE hypothesis states that forced entrainment into the Lagrangian plume element (a control volume) is equal to the ambient flow through the plume element projected area in unit time. Forced entrainment is the dominant entrainment mechanism in moderate to high current and augments the Taylor (or aspiration) ent...

Estuarine and Coastal Modeling (2009), 2010

ABSTRACT A recent model application has been developed by the Washington State Dept. of Ecology t... more ABSTRACT A recent model application has been developed by the Washington State Dept. of Ecology that simulates water circulation in South Puget Sound (SPS) using the Generalized Environmental Modeling System for Surface waters (GEMSS) with an open northern boundary near Edmonds, WA. Post-calibration root mean square errors (RMSEs) are <5% of Ehe tidal range in all but Oakland Bay where the error was 10% of the tidal range. The model simulates salinity with a RMSE of 0.6 psu near the surface and 0.5 psu near the seafloor compared with field observations at 22 key stations.