Modelling of Pollutant Transport in the Atmosphere - MANHAZ

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Figure8: Deposition footprint simulation by RIMPUFF of a depositing 137 Cs plumes from a simulated accident at the Ignalina NPP; Lithuanian. Figure 8 shows a RIMPUFF calculated footprint of deposited radioactivity from a 137 Cs plume from the Ignalina NPP. During the plume passage, the deposition rate varies according to the local surface characteristics (land, water, forest, urban, etc.). Figure 9 Simulations of continuous plume dispersion from the Met-tower at the Risø National Laboratory, Roskilde, Denmark, during a period with strong vertical winddirectional shear. Solid curves: accounting for wind shear (by RIMPUFF model features shear rise and trifurcation), dotted curves: ignoring the wind shear effects. 38
Another example, showing the effect of strong vertical directional shear, is shown in Fig. 9. The consequence for emergency response strategy may be dramatic! Urban Dispersion: Figure 10. Urban Dispersion scenario from a hypothetical release of Anthrax in the stairways to the metro at Kgs. Nytorv, Copenhagen. Urban Dispersion. An example of local dispersion within an urban area (Central Copenhagen in this case), is shown in Figure 10. The calculation has been performed with the British UDM Urban dispersion model (Hall et al., 2002). UDM can be nested with RIMPUFF so that UDM calculates the initial urban dispersion influenced by the buildings, while RIMPUFF takes over at longer distances. 39
Page 1 and 2: MANHAZ position paper on: Modelling
Page 3 and 4: Troposphere. Trapped between the st
Page 5 and 6: The importance of the local wind fi
Page 7 and 8: Figure 2. Typical vertical wind spe
Page 9 and 10: Notice that this source of turbulen
Page 11 and 12: dient winds can approximate the reg
Page 13 and 14: y Russian and British researchers t
Page 15 and 16: σ () t = 2K t + σ () 0 2 2 z z z
Page 17 and 18: Figure 3 Pasquill stability classif
Page 19 and 20: Monin-Obukhov similarity scaling (z
Page 21 and 22: With Richardson's diffusivity KDN i
Page 23 and 24: The corresponding predicted puff gr
Page 25 and 26: The cyclic variation of the stabili
Page 27 and 28: Dispersion modelling has also high
Page 29 and 30: structure of the diffusion. In prin
Page 31 and 32: Atmospheric dispersion module for n
Page 33 and 34: LSP is a local scale pre-processing
Page 35 and 36: It consists of nested modules, whic
Page 37: land uses the nearest land-based Me
Page 41 and 42: Density calculations. Numerical dis
Page 43 and 44: cloud is expected to cover a larger
Page 45 and 46: Auxiliary parameters like concentra
Page 47 and 48: Variable atmospheric wind condition
Page 49 and 50: Busch, N.E., On the Mechanics of At
Page 51 and 52: Monin A.S. (1959) Smoke propagation
Page 53 and 54: Goldwire, H. C., McRae, T. G., John
Page 55: Table of Content Modelling of Pollu

Modelling of Pollutant Transport in the Atmosphere - MANHAZ

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