A second-order closure model for the effect of averaging time on turbulent plume dispersion
- Titan Research and Technology, Princeton, NJ (United States)
Turbulent dispersion in the atmosphere is a result of chaotic advection by a wide spectrum of eddy motions. In genera, the larger scale motions behave like a time-dependent, spatially inhomogeneous mean wind and produce coherent meandering of a pollutant cloud or plume, while the smaller scale motions act to diffuse the pollutant and mix it with the ambient air. The distinction between the two types of motion is dependent on both the sampling procedure and the scale of the pollutant cloud. For the case of a continuous plume of material, the duration of the sampling time (the time average period) determines the effective size of the plume. The objective is the development of a practical scheme for representing the effect of time-averaging on plume width. The model must describe relative dispersion in the limit of short-term averages, and give the absolute, or ensemble, dispersion rate for long-term sampling. The authors shall generalize the second-order closure ensemble dispersion model of Sykes et al. to include the effect of time-averaging, so they first briefly review the basic model.
- Sponsoring Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); Defense Nuclear Agency, Washington, DC (United States)
- OSTI ID:
- 422888
- Report Number(s):
- CONF-960127-; TRN: IM9707%%195
- Resource Relation:
- Conference: 9. joint American Meteorological Society/Air and Waste Management Association conference on applications of air pollution meteorology, Atlanta, GA (United States), 28 Jan - 2 Feb 1996; Other Information: PBD: [1996]; Related Information: Is Part Of Ninth joint conference on applications of air pollution meteorology with A and WMA; PB: 672 p.
- Country of Publication:
- United States
- Language:
- English
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