Abstract
Atmospheric dispersion experiments are carried out in Copenhagen under neutral and unstable conditions in order to study the atmospheric dispersion process in a built-up area. The tracer sulphurhexafluoride is released without buoyancy from a meterological instrumented tower at a height of 115 m, and then collected at ground-level positions in up to three crosswind series of tracer-sampling units, positioned 2–6 km from the point of release. In addition to standard meteorological profile measurements along the tower, the three-dimensional wind fluctuations at the height of release are measured. Characteristic dispersion parameters are estimated from the measured tracer concentrations (averaging time 1 hour), and compared to the dispersion parameters that can be calculated from the atmospheric parameters by various methods. Some of these methods (based on a stability-index) have been in common use for a long time, other (based on wind-fluctuation measurements) reflect recent research. The wind-fluctuation based methods turned out to compare most favourably with the results from the experiments. Based on these experiments a half-empirical model is devised for the prediction of the lateral and vertical dispersion parameters, σy and σZ, for elevated point sources in an urban area under neutral to unstable conditions.
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References
DRAXLER, R.R., 1976, Determination of atmospheric diffusion parameters. Atmos. Environ., 10: 99.
GRYNING, S.E., LYCK, E., and HEDEGAARD, K., 1978, Short-range diffusion experiments in unstable conditions over inhomogeneous terrain. Tellus, 30: 392.
GRYNING, S.E., and THOMSON, D.W., 1979, A tall tower instrument system for mean and fluctuating velocity, fluctuating temperature and sensible heat flux measurements. J. Appl. Meteorol., 18: 1674.
GRYNING, S.E., PETERSEN, E.L., and LYCK, E., 1980, Elevated source SF6-tracer dispersion experiments in the Copenhagen area. Preliminary results I. Proceedings of the tenth international technical meeting on air pollution modelling and its application. NATO/CCMS Air Pollution Pilot Study, Rome, Italy, October 22–26, 1979, 119.
GRYNING, S.E., and LYCK, E., 1980a, Elevated source SF6-tracer dispersion experiments in the Copenhagen area. Preliminary results II. In: European seminar on radioactive releases and their dispersion in the atmosphere following a hypothetical reactor accident. Vol. 2. Ris(6, April 22–25, 1980. ( Commission of the European Communities, Luxemburg ), 905.
GRYNING, S.E., and LYCK, E., 1980b, Medium-range dispersion experiments downwind from a shoreline in near neutral conditions. Atmos. Environ., 14: 923.
GRYNING, S.E., 1982, Elevated source SF6-tracer dispersion experiments in the Copenhagen area. Riss6-R-446.
HAY, J.S., and PASQUILL, F., 1959, Diffusion from a continuous source in relation to the spectrum and scale of turbulence. In: Atmospheric diffusion and air pollution. Proceedings of a symposium held at Oxford, August 24–29, 1958. Ed. by F.N. Frenkiel and P.A. Sheppard (Advances in Geophysics, 6 ) Academic Press, London, 345.
PASQUILL, F., 1974, Atmospheric diffusion. The dispersion of wind-borne materials from industrial and other sources. 2. edition. Wiley, London.
PASQUILL, F., 1976, Atmospheric dispersion parameters in Gaussian plume modelling. Part II. Possible requirements for change in the Turner workbook values. EPA–600/4–76–030B. PB–258036:3 GA.
SMITH, F.B., 1972, A scheme for estimating the vertical dispersion of a plume from a source near ground-level. Proceedings of the third meeting of the expert panel on air pollution modelling. A report of the air pollution pilot study, Nato Committee on the Challenges of Modern Society, Paris, France, XVII-2 to 14.
SMITH, M.E., (Ed.) 1973, Recommended guide for the prediction of the dispersion of airborne effluents. 2. American Society of Mechanical Engineers, New York.
TURNER, D.B., 1970, Workbook of atmospheric dispersion estimates. HPS Pub. 999-AP-26.
WANDEL, C.F., and KOFOED-HANSEN, O., 1962, On the Eulerian-Lagrangian transform in the statistical theory of turbulence. J. Geophys. Res., 67: 3089.
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© 1983 Plenum Press, New York
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Gryning, SE., Lyck, E. (1983). Results from Elevated-Source Urban Area Dispersion Experiments Compared to Model Calculations. In: De Wispelaere, C. (eds) Air Pollution Modeling and Its Application II. NATO · Challenges of Modern Society, vol 3. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-7941-6_46
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DOI: https://doi.org/10.1007/978-1-4684-7941-6_46
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