Abstract
Tracer dispersion experiments conducted in near-neutral stability on the upwind slopes of a small isolated hill are described. Dual tracers were used to give simultaneous plumes from release heights of 0.2 H and 0.4 H, where H is the height of the hill. Results are compared with a simple Gaussian plume model for flat ground. The increase in crosswind plume spread due to the hill is shown to be in agreement with a linear flow model. The maximum observed concentration is found to be reduced from the predicted flat ground value. As the length scale of the hill is of similar size to the dominant scale of turbulence, this may be explained by enhancement of low frequency meandering of the plume, due to horizontal flow divergence around the hill.
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