Contribution to Book
Obliczenia rozprzestrzeniania się pyłu drobnego w powietrzu atmosferycznym z wykorzystaniem dyfuzyjnych modeli GaussaNauka i wiedza kluczem do poznania świata (2015)
The chapter presents a comparison of results of modelling concentrations of fine dust (suspended dust PM10) in the air with the use of two diffusion models: the Gaussian plume model (used commonly in Poland), and the Gaussian puff model CALPUFF (used significantly less frequently). It indicates discrepancies in obtained results of calculations for point emitters taking into consideration three dimensional options (with the following heights: 20, 40 and 60 m and diameters of respectively: 1.0, 1.5 and 2.0 m). For particular variants, errors were visualised, resulting from use of the simple Gaussian plume model in place of the advanced CALPUFF model.
On the basis of calculations it was stated that the reference methodology for modelling concentrations of suspended dust (PM10) in the air, used in Poland, based on the Gaussian plume model makes it possible to relatively precisely locate the place with the highest of maximum one-hour concentrations caused by a point emitter at ground surface. However, it is possible to understate the results of calculations of values of these concentrations near the emitter (even 2 or 3 times) as compared with the more advanced Gaussian puff model CALPUFF. Along with the increase in the height of the emitter, the underprediction of calculation of maximum one-hour concentrations of PM10 in the air decreases. For low emitters in areas less frequently exposed to transport of pollution from a given emitter (in connection with small frequency of presence of winds from a given direction), it is possible to expect overprediction of calculation results for these concentrations by the Gaussian plume model near the emitter and underprediction of the calculation results in further from it. In the case of emitters with the height of ca. 60 m or higher, some underpredictions of calculation results can occur both in closer and further distance from the emitter.
In the case of average annual concentrations, the results obtained by means of the simple Gauss plume model show average underprediction in relation to CALPUFF model at the level of ca. 35-50% for emitters with the height of 40-60 m in the calculation field with the dimensions of 16x16 km (at a similar level of errors both in closer and further distance from the emitter). In the case of higher point emitters, even greater underpredictions of calculation results should be expected. Omission, in the calculation methodology for spatial variability, commonly used in Poland, of terrain features, as well as spatial and temporal meteorological conditions (including height of the mixing stratum and the wind field), as well as the effect of free settling of dust, can contribute to obtaining hardly representative results of calculation of average annual concentrations of suspended dust in the air. This methodology needs to be verified, especially under the adopted assumption that 50% of suspended dust reaching the land surface is subject to dry absorption by the base.
English title: Calculations of spread of fine dust in the air with the use of Gaussian diffusion models.
- fine particle matter,
- air pollution,
- atmospheric dispersion modeling,
- Gaussian plume model,
- Gaussian puff model,
- air quality impact assessment
Publication DateJune 30, 2015
EditorM. Olkiewicz, M. Drewniak
PublisherMateusz Weiland NETWORK SOLUTIONS
Citation InformationRobert Oleniacz and Mateusz Rzeszutek. "Obliczenia rozprzestrzeniania się pyłu drobnego w powietrzu atmosferycznym z wykorzystaniem dyfuzyjnych modeli Gaussa" SłupskNauka i wiedza kluczem do poznania świata (2015) p. 42 - 51
Available at: http://works.bepress.com/robert_oleniacz/134/