Effects of a dense vapour cloud on turbulence near the ground

The transport and dispersion of vapor from the LNG spills was studied. An extensive array of instrumentation was deployed to collect micrometeorological and gas concentration data. Wind velocity data were processed to describe the mean wind field and levels of turbulence. Most experiments were run under neutral to unstable atmospheric stability, with wind speeds greater than 5 m/s. Under these conditions, the mean wind field and ambient turbulence level were relatively unaffected by the presence of the vapor cloud. One experiment was done in low wind speed, slightly stable conditions. In this instance, the mean wind and ambient turbulence were modified within about 100 m downwind of the spill point by the cloud.