Analysis of wind tunnel dispersion data over two-dimensional obstacles

✍ Scribed by F. Trombetti; F. Tampieri

• Book ID: 104628756
• Publisher: Springer
• Year: 1992
• Tongue: English
• Weight: 995 KB
• Volume: 59
• Category: Article
• ISSN: 0006-8314
• DOI: 10.1007/bf00119812

✦ Synopsis

An analysis of wind tunnel data of dispersion from elevated point sources over a flat floor and gently sloping, 2-D hills is performed. (The data were obtained by Khurshudyan et al., 1981.)

Formulas for the mixing lengths and the Lagrangian time scales are tested, suitable for use in various dispersion models. Some expressions for the vertical first moments of the plume concentration distribution suitable for shear flow are also tested.

Then, a normalization is suggested, based on the source mean flow and turbulence parameters, for the ground-level concentration maximum value and position along the plume centerline. Using this normalization, the maximum position is almost constant, regardless of source height variation and of whether the hill is present or not, at least for source positions upstream or over the top.

The maximum values allow the determination of normalized terrain amplification factors TAFN, which are shown to be in most cases closer to one than the corresponding TAF obtained without normalization.