Plume dispersion is release driven by pressure and is carried away by air currents.

Plume dispersion is release driven by pressure and is carried away by air currents.

• A. Spherical dispersion
• B. Hemispherical dispersion
• C. Plume dispersion
• D. Cone shape dispersion

Answer: (C)

Plume dispersion is about how a contaminant moves with the wind once it’s released. The release may start with some pressure-driven jet, but the dominant transport is the air currents carrying the material downwind, stretching the release into an elongated plume. This downwind transport by wind (advection) is what gives plume dispersion its characteristic shape and direction. In still air, dispersion would tend to spread roughly equally in all directions (spherical). Near the ground, the spread is shaped by the surface, producing a hemispherical pattern rather than a long, downwind plume. A cone-shaped dispersion isn’t the typical model for a continuous release under wind conditions. So the correct concept describes a plume formed and carried away by air currents after a pressure-driven release.

Plume dispersion is about how a contaminant moves with the wind once it’s released. The release may start with some pressure-driven jet, but the dominant transport is the air currents carrying the material downwind, stretching the release into an elongated plume. This downwind transport by wind (advection) is what gives plume dispersion its characteristic shape and direction.

In still air, dispersion would tend to spread roughly equally in all directions (spherical). Near the ground, the spread is shaped by the surface, producing a hemispherical pattern rather than a long, downwind plume. A cone-shaped dispersion isn’t the typical model for a continuous release under wind conditions. So the correct concept describes a plume formed and carried away by air currents after a pressure-driven release.