Double-camera measurements of plumes, applied to wind field characterization and dispersion studies

A stereophotogrammetric technique based on standard equipment to measure plume trajectories in sheared wind fields and/or complex terrain is shown here. The approach is to use existing visible plumes as tracers of opportunity of air flow. This technique was first developed as part of a multi-instrument field program intended for the experimental characterization of atmospheric dispersion in the complex coastal area of Bilbao in northern Spain. Emphasis is placed on the calibration method and the experimental procedures as well as on sources and margins of error. Finally, applications and joint usage with other techniques during several field programs are also presented.