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Development and preliminary field evaluation of a field-of-view near-real-time 3D stack plume model developed for the measurement attributes of remote optical sensors

A field-of-view stack plume model, developed for use with remote optical sensors, was evaluated using field data collected during February and March 1994 at a Department of Energy test site where homogeneously mixed and heated sulfur hexafluoride in air were intermittently released under controlled stack conditions from a 16-inch-diameter 70-foot stack. The duration of each of the intermittent periods ranged from approximately 2 to 4 hours. A total of 27 hours of released occurred over a 3-week period. The model is 3D with animation, focuses on the first 100 meters downwind from the stack, and has a temporal resolution of 1 second. It determines concentration pathlength for up to 6 compounds as well as a bitmap of plume temperatures and concentration. The model's performance was evaluated by comparing field observed versus model-predicted plume vertical thickness, which were monitored in near real time using infrared cameras operated in the sulfur hexafluoride band and mounted alongside the plume. For a sensor-plume scenario, comparisons were also made between model-predicted concentration pathlengths and concentration pathlengths derived from the observed vertical plume thickness, measured wind speed, gravitational effects, and conservation of mass in the plume. In predicting the plume's vertical thickness through its center, the model's range of accuracy was +34.0 to -21.4% for the inclusive distances between 5-50m from the stack. In predicting the plume's concentration pathlength for sulfur hexafluoride, this translated to a range of accuracy of +27.1 to -25.4% for a specific plume-optical sensor scenario. The arithmetic mean for this range was +5.19%.