Visual and concentration measurements were made for a large number of continuous ground-level releases of heavy gases into a wind-tunnel boundary layer. These different plumes were not affected by any topographic or building wake influences. The experiments provided a broad coverage of the variable range of source gas specific gravity, source gas flow rate, and approach flow wind speed.

Wind-tunnel transient concentration data were obtained from modeling tests which reproduced gaseous dispersion from five different forty cubic meter or less liquefied natural gas (LNG) spills performed at China Lake Naval Weapons Center. Comparisons in the transient concentration data between these modeled tests and the field tests indicated which parameters are dominant in the modeling process. Model tests which reproduced the wind shear and turbulence...