Source Parameter Estimation using the Second-order Closure Integrated Puff Model
Technical Report,01 Mar 2013,01 Mar 2016
Sage Management Princeton United States
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A new method for estimation of source parameters from sensor measurements, using the Second-order Closure Integrated Puff Model SCIPUFF is proposed. The sensor measurements are categorized as triggered and non-triggered based on the recorded concentration measurements and a threshold concentration value. Using each measured value, sources of adjoint material are created from the triggered and non-triggered sensors, and the adjoint transport equations are solved to predict the adjoint concentration fields. The adjoint source strength is inversely proportional to the concentration measurement for the sensor, and the adjoint source duration is equal to the averaging time of the sensor. Using the non-triggered adjoint concentrations at each location in the domain, each triggered adjoint concentration is weighted and the source release location is obtained by finding the location at which the triggered adjoint concentrations are closest to each other. Based on the release location, the release mass can also be ascertained. The method is tested using data from the Fusion Field Trial 2007 FFT07 and the European Tracer Experiment ETEX.
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