AERMOD Tech Guide

Gaussian Plume Air Dispersion Model

3.1.4 Convective Velocity Scale(w)

Field observations, laboratory experiments, and numerical modeling studies show that the large turbulent eddies in the CBL have velocities proportional to the convective velocity scale ( w*) (Wyngaard, 1988). Thus in order to estimate turbulence in the CBL, an estimate of , w* is needed. AERMET calculates the convective velocity scale from its definition (see Wyngaard, 1988) as:

Equation (10)