Piringer M., Knauder W., Petz E., Schauberger G., 2014, Use of Ultrasonic Anemometer Data to Derive Local Odour- related Peak-to-mean Concentration Ratios, Chemical Engineering Transactions, 40, 103-108.
In Austria, a peak-to-mean approach is used to transform half-hourly mean concentrations calculated by the Austrian Odour Dispersion Model AODM to instantaneous values depending on the stability of the atmosphere describing the stimulus concentration of the odour perception. The reduction of the peak-to- mean ratio with distance due to turbulent mixing is described with an exponential attenuation function which involves knowledge of the standard deviations of the three wind components. Apart from obtaining these values via prescribed relations from the known average wind speed (approach by Robins), they can be derived directly from 3D ultrasonic anemometer measurements. Therefore, a measure of atmospheric stability has to be used. In this work, it has been determined by the Austrian Reuter-Turner scheme (based on cloudiness and wind speed) and the Obukhov Stability Parameter (OSP) derived directly from the ultrasonic anemometer measurements. The latter delivers site-specific attenuation curves. Results for two sites are presented and compared to general attenuation curves obtained from the Robins’ approach.
