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Modelling-tracer study for risk assessment of a proposed sour gas facility

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Abstract

As an integral part of a risk assessment of a sour gas pipeline proposed for a recreational area in the Rocky Mountain foothills, the dispersion of hydrogen sulphide was assessed using meteorological monitoring, tracer gas concentration measurement and a complex terrain diffusion model. Sulphur hexafluoride was released into the nocturnal drainage winds of two valleys in the eastern slopes of the Alberta Rockies southwest of Calgary. The resulting concentrations were measured at several points on transects at various distances from the source. The NUVAL version of the dispersion model IMPACT (Integrated Model for Plumes and Atmospherics in Complex Terrain) was site tuned using the measured concentrations and concurrent meteorological data. Relative mean absolute errors of 24–50% were obtained. The Gaussian model (PLUMES) with modified stability classes gave relative mean absolute errors of 42–64% in predicting transect maxima. Dilution rates were found to be much larger than would be experienced under similar conditions over flat terrain.

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References

  1. Alberta Environment: 1980, ‘Guidelines for Plume Dispersion Calculations’, Alberta Environment Publication, 112 pp.

  2. Angle, R. and Gourlay, P.: 1982, ‘Dispersion Climatology of the Moose Mountain Area’, Alberta Environment Publication, 105 pp.

  3. BarrS., KyleT. G., ClementsW. E. and SedlacekW.: 1983, ‘Plume Dispersion in a Nocturnal Drainage Wind’, Atmos. Env. 17, (8), 1423–1429.

  4. Baskett, R.: 1982, Atmospheric Tracer Studies Conducted for the Mount Emmons Project, Gunnison County, Colorado, Camp Dresser and McKee Inc. Report prepared for AMAX.

  5. Bercha, F. G.: 1983, Risk Analysis of Shell Proposed Moose Mountain Pipelines and Related Facilities, Report prepared for Shell Canada Resources Ltd.

  6. Egan, B. A.: 1975, ‘Turbulent Diffusion in Complex Terrain’, Lectures on Air Pollution and Environmental Impact Analysis. Amer. Met. Soc., The Egan (1975) reference is a book published by the American Meterological Society, 112–135.

  7. FabrickA. J., SklarewR. C., and WilsonJ. C.: 1977, Point Source Modelling, Form and Substance, Inc. Westlake, Calif.

  8. FosbergM.A.: 1984, ‘Transport and Diffusion in the Transition Layer and Planetary Boundary Layer for Drainage Flows in Anderson and Putah Creeks, California During ASCOT 1980’, J. of Clim. and Appli. Met. 23, 812–823.

  9. FoxD. G.: 1981, ‘Judging Air Quality Model Performance’, Bull. Amer. Met. Soc. 62: 599–609.

  10. Geiger, R.: 1959, The Climate Near the Ground. Harvard University Press, 494 pp.

  11. LambB., ShairF., and LorenzenA.: 1978, ‘Atmospheric Dispersion and Transport Within Coastal Regions Part 1’, Atmos. Envir. 12, 2809–2100.

  12. McNider, R. T.: 1982, Numerical Simulation of Plume Impaction, Conference Papers, Third Joint Conference on Applications of Air Pollution Meteorology, San Antonio, AMS, Boston, pp. 126–129.

  13. Pasquill, F.: 1976, Atmospheric Dispersion Parameters in Gaussian Plume Modelling, Part II, Possible Requirements for Change in the Turner Workbook Values, U.S. EPA Report EPA-600/4-76-0306, Research Triangle Park, North Carolina, 43 pp.

  14. Sklarew, R. C. and Mirabella, V. A.: 1982, Experience in IMPACT Modelling In Complex Terrain, Conference Papers, Third Joint Conference on Applications of Air Pollution Meteorology, San Antonio, AMS, Boston.

  15. Sklarew, R. C. and Henderson, D. A.: 1978, Initial Evaluation of IMPACT in EPA Region VIII, Amer. Meteor Soc. Conference on the Application of Air Pollution Meteorology, Salt Lake City.

  16. TurnerD. B.: 1967, Workbook of Atmospheric Dispersion Estimates, Cincinnati, Ohio: U.S. Dept. of Health, Education and Welfare. Public Health Services Publ. No. Ap-26.

  17. Whiteman, C. D. and Allwine, K. J.: 1982, Green River Ambient Assessment Program FY-1982 Progress Report, Pacific Northwest Laboratory Publication—Draft Report PNL-4520.

  18. Wilson, D. J.: 1982, Predicting Risk of Exposure to Peak Concentrations in Fluctuating Plumes, Report prepared for Pollution Control Division, Alberta Environment.

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Sakiyama, S.K., Angle, R.P. Modelling-tracer study for risk assessment of a proposed sour gas facility. Environ Monit Assess 10, 133–146 (1988). https://doi.org/10.1007/BF00401778

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Keywords

  • Risk Assessment
  • Dilution Rate
  • Complex Terrain
  • Hydrogen Sulphide
  • Flat Terrain