A preliminary analysis of measurements from a near-field pollutants dispersion campaign in a stratified surface layer
by Xiao Wei; Eric Dupont; Bertrand Carissimo; Eric Gilbert; Luc Musson-Genon
International Journal of Environment and Pollution (IJEP), Vol. 55, No. 1/2/3/4, 2014

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.

Online publication date: Wed, 17-Dec-2014

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