By Y. Mahrer (auth.), Han van Dop, George Kallos (eds.)

The curiosity in pollution modelling has proven great progress over the past 5 years. This used to be rather glaring via the expanding variety of contributors attending the NATO/CCMS foreign Technical conferences on pollution modelling and its program. on the final assembly 118 papers and posters have been chosen from an abundance of submitted abstracts divided over 5 modelling themes: (i) version evaluate and verification, together with coverage purposes, (ii) pollution modelling in coastal components with emphasis at the mediterranean area, (iii) unintended atmospheric releases, together with caution structures and rules, (iv) modelling of worldwide and long-range shipping and (v) new advancements in turbulent diffusion. A round-table dialogue chaired by means of John Irwin (USA) and Jan Kretzschmar (Belgium) at the harmonization of pollution types used to be attended by means of greater than 50 scientists and is mentioned in those lawsuits. the hole paper addressed the most factor of this convention: modelling over complicated terrain. Of specific curiosity have been coastal components the place the skin inhomogeneities introduce small-scale flow and ranging atmospheric balance, frequently mixed with a posh topography. because the convention was once situated at the attractive island of Crete, difficulties confronted via the host state, relatively Athens and its environs have been noticeable examples for attention. those including different areas with related geographical positive factors have been addressed. seriously populated and industrialized as they generally are, air caliber is usually terrible there and emission rules are wanted. evidently, a huge activity of pollution dispersion modelling is to aid coverage makers in formulating good regulations.

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1984. Wind tunnel simulation of diffusion in a convective boundary layer. Boundary Layer Met. 30: 431-455. R. H. 1980. Experiments on stably stratified and neutrally stratified flow over a model three-dimensional hill. J. Fluid Mech. 96: 671-704. [29] Geiger, P. 1990. Ecoulement d'une fumee autun d'une colline. Promotion X87, Ecole Poly technique, Sophia Antipolis, Valbonne. J. A. 1982. EPA Complex Terrain Model Development: First mileston report (1981), EPA-600/3-82-036. J. M. 1988. Stably stratified shear flow over low hill.

H .... Poreh & Cermak (II) ..... Non-Gouulon (I} ......... Non-Gauulo" (II) ............ ,_ _ j oo 130 210 380 150 780 110 Figure 4. 0 m/s. The calculations include a wake downwind of the hill. (a) Contours of potential ¢ and streamfunction 'l/J; (b) contours of concentration. l20 780 150 ~ ---i-.... g. Cinder Cone Butte diffusion experiments [33] by US-EPA) reveal that the flow divides into two regions. Defining the Froude number F = Uoo/NH, where Uoo and N are the upstream values of the horizontal velocity and buoyancy frequency and H the height of the hill, then for height z > He, the critical height defined as He = H(l - F), the air flows over the hill and can be calculated as the equivalent flow over a cut-off hill with height H - He.

1989, CAR model: Calculation of Air pollution from Road traffic, Ministry of Housing, Physical Planning and Environment, VROM 90435/8-89, Leidschendam, The Netherlands 48 A CONCEYfUAL FRAMEWORK FOR EVALUATING THE PERFORMANCE OF GRID-BASED PHOTOCHEMICAL AIR QUALI1Y SIMULATION MODELS Philip M. Roth and Steven D. Reynolds Envair Marin County, California Thomas W. Tesche Alpine Geophysics Crested Butte, Colorado Robin L. S. Environmental Protection Agency Research Triangle Park, North Carolina I.

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