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A preliminary analysis of measurements from a near-field pollutants dispersion campaign in a stratified surface layer

Abstract : In order to study pollutants dispersion in a stably stratified surface layer at small scales, a pollutants dispersion field experiment programme is being conducted on the site SIRTA in the southern suburb of Paris. In a preliminary campaign held during the winter of 2012 with continuous gas releases, we had 12 ultrasonic anemometers measuring wind velocity and temperature at 10 Hz, and six photo-ionisation detectors measuring gas concentration at 50 Hz. Turbulence is verified to be anisotropic by calculating variances, integral length scales and power spectra of velocity. Some evidence of a −1 power law sub-range has been found in velocity power spectra. Also, we have deduced eddy advection velocity from spatial velocity cross-correlation and found it greater than mean wind speed measured directly by sensors. Concentration measurements are corrected by using a baseline method. Significant relationships between concentration and turbulence measurements at high frequency are still under further study.
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https://hal-enpc.archives-ouvertes.fr/hal-01141747
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Soumis le : lundi 13 avril 2015 - 16:17:39
Dernière modification le : lundi 10 février 2020 - 18:12:45

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Xiao Wei, Eric Dupont, Bertrand Carissimo, Eric Gilbert, Luc Musson Genon. A preliminary analysis of measurements from a near-field pollutants dispersion campaign in a stratified surface layer. International Journal of Environment and Pollution, Inderscience, 2014, 55 (1/2/3/4), pp.184-191. ⟨10.1504/IJEP.2014.065923⟩. ⟨hal-01141747⟩

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