A three-dimensional, non-hydrostatic, terrain-following numerical model was used to investigate the Adelaide gully wind of South Australia. It reproduced most features of this downslope wind. Results showed that the onset and strength of the Adelaide gully wind are critically dependent on the upstream wind and potential temperature profiles, and that the appearance of this local wind is also strongly influenced by the complicated three-dimensional effect of the real topography. The results also suggest that the production of the Adelaide gully wind can be explained by either the wave-resonant amplification mechanism or the hydraulic amplification mechanism. A sensitivity study of the numerical model showed that a grid size of Δx = Δy = 1 km is desirable for resolving the fine structures of the Adelaide gully wind, including regions of reversed wind flow at the surface.
|Number of pages
|Australian Meteorological Magazine
|Published - 1996 Mar