Journal
ATMOSPHERIC ENVIRONMENT
Volume 181, Issue -, Pages 82-96Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2018.03.028
Keywords
Source term estimation; Data assimilation; Urban atmospheric dispersion; Hazardous pollutant; Source inversion; CFD model
Funding
- NPRP award from the Qatar National Research Fund (a member of The Qatar Foundation) [NPRP 7-674-2-252]
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In this work, we present an inverse computational method for the identification of the location, start time, duration and quantity of emitted substance of an unknown air pollution source of finite time duration in an urban environment. We considered a problem of transient pollutant dispersion under stationary meteorological fields, which is a reasonable assumption for the assimilation of available concentration measurements within 1 h from the start of an incident. We optimized the calculation of the source-receptor function by developing a method which requires integrating as many backward adjoint equations as the available measurement stations. This resulted in high numerical efficiency of the method. The source parameters are computed by maximizing the correlation function of the simulated and observed concentrations. The method has been integrated into the CFD code ADREA-HF and it has been tested successfully by performing a series of source inversion runs using the data of 200 individual realizations of puff releases, previously generated in a wind tunnel experiment.
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