In a specific scenario with a release rate allowing for a 1.5-minute airborne release, which behavior is most appropriate for modeling the dispersion at a distance of 2000 m?

The puff dispersion model is the most appropriate for modeling a scenario with a 1.5-minute airborne release at a distance of 2000 meters because it characterizes short-duration, discrete emissions that behave like a single cloud or "puff" of pollutants. In this context, the release rate and duration indicate a limited emission period, making the puff model suitable for capturing the initial dynamics of the airborne release.

In puffs, the dispersion is modeled as a series of distinct emissions that rapidly decrease in concentration as they disperse over time and distance. This is particularly relevant when the release is short-lived, as it allows for a more accurate representation of the concentration profiles that would be observed shortly after the release occurs.

A continuous model would assume an ongoing release, which is not aligned with the specified short duration of the release. The cloud model might imply a more uniform and extended release over a longer timeframe, while the plume model often applies to continuous releases that can create a narrow, elongated area of contamination. Each of these options would not adequately capture the transient nature of a short-term release compared to the puff model.