Observational studies of air quality and air flow over a ridge downwind of a stack

Stephen F. Benjamin, J.J. Havlena, R.D. Rowe

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The body of information presented in this paper is directed to those persons in industry and government who are concerned with the effects of elevated ground on plume dispersion. A field program is being conducted around a sour gas processing plant to determine the extent to which the ridge, situated near the stack, affects the air quality and air flow that would otherwise be observed over a flat terrain. Of particular interest is the definition of the weather types leading to the worst pollution episodes. From such studies optimization of stack design for similar stack/topographical configurations can be made. The analysis of routinely collected SO2 and wind data for two locations along the ridge has shown that, for flow towards the ridge, high wind neutral atmospheres at the location nearest the plant and lighter wind stable atmospheres at the location furthest from the plant produce the highest frequency of peak concentrations respectively. This has prompted an investigation of the flow patterns and plume behaviour for these conditions. A flow visualization experiment is being conducted to examine the effect of stable flow towards the ridge. Smoke trails up to 200m above ground are generated and a photogrammetric procedure is used to examine the smoke trajectories at various heights above the terrain. Experiments conducted for stable flows indicate the presence of a ridge induced directional shear providing evidence of a mechanism to explain the high frequency of peak concentrations observed under these conditions.
Original languageEnglish
Title of host publicationProceedings of the 70th Annual Meeting of the APCA Toronto, Canada
PublisherAir Pollution Control Association
Pagespaper no. 77-4.3
Publication statusPublished - 1977

Fingerprint

airflow
air quality
smoke
plume
atmosphere
flow pattern
visualization
experiment
trajectory
weather
pollution
stack
industry
gas
effect

Bibliographical note

The full text of this item is not currently available from the repository. Paper presented at the 70th Annual Meeting of the Air Pollution Control Association, held 20-24 June 1977, Toronto, Canada.

Keywords

  • plume dispersion
  • air pollution
  • diffusion and transport processes
  • elevated ground

Cite this

Benjamin, S. F., Havlena, J. J., & Rowe, R. D. (1977). Observational studies of air quality and air flow over a ridge downwind of a stack. In Proceedings of the 70th Annual Meeting of the APCA Toronto, Canada (pp. paper no. 77-4.3). Air Pollution Control Association.

Observational studies of air quality and air flow over a ridge downwind of a stack. / Benjamin, Stephen F.; Havlena, J.J.; Rowe, R.D.

Proceedings of the 70th Annual Meeting of the APCA Toronto, Canada. Air Pollution Control Association, 1977. p. paper no. 77-4.3.

Research output: Chapter in Book/Report/Conference proceedingChapter

Benjamin, SF, Havlena, JJ & Rowe, RD 1977, Observational studies of air quality and air flow over a ridge downwind of a stack. in Proceedings of the 70th Annual Meeting of the APCA Toronto, Canada. Air Pollution Control Association, pp. paper no. 77-4.3.
Benjamin SF, Havlena JJ, Rowe RD. Observational studies of air quality and air flow over a ridge downwind of a stack. In Proceedings of the 70th Annual Meeting of the APCA Toronto, Canada. Air Pollution Control Association. 1977. p. paper no. 77-4.3
Benjamin, Stephen F. ; Havlena, J.J. ; Rowe, R.D. / Observational studies of air quality and air flow over a ridge downwind of a stack. Proceedings of the 70th Annual Meeting of the APCA Toronto, Canada. Air Pollution Control Association, 1977. pp. paper no. 77-4.3
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AB - The body of information presented in this paper is directed to those persons in industry and government who are concerned with the effects of elevated ground on plume dispersion. A field program is being conducted around a sour gas processing plant to determine the extent to which the ridge, situated near the stack, affects the air quality and air flow that would otherwise be observed over a flat terrain. Of particular interest is the definition of the weather types leading to the worst pollution episodes. From such studies optimization of stack design for similar stack/topographical configurations can be made. The analysis of routinely collected SO2 and wind data for two locations along the ridge has shown that, for flow towards the ridge, high wind neutral atmospheres at the location nearest the plant and lighter wind stable atmospheres at the location furthest from the plant produce the highest frequency of peak concentrations respectively. This has prompted an investigation of the flow patterns and plume behaviour for these conditions. A flow visualization experiment is being conducted to examine the effect of stable flow towards the ridge. Smoke trails up to 200m above ground are generated and a photogrammetric procedure is used to examine the smoke trajectories at various heights above the terrain. Experiments conducted for stable flows indicate the presence of a ridge induced directional shear providing evidence of a mechanism to explain the high frequency of peak concentrations observed under these conditions.

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