Editorial Type:
Article
Article Type:
Research Article

Alongwind Dispersion—A Simple Similarity Formula Compared with Observations at 11 Field Sites and in One Wind Tunnel

Steven R. Hanna School of Computational Sciences, George Mason University, Fairfax, Virginia

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Pasquale Franzese School of Computational Sciences, George Mason University, Fairfax, Virginia

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Print Publication:
01 Oct 2000
DOI:
https://doi.org/10.1175/1520-0450-39.10.1700
Page(s):
1700–1714
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Abstract

Observations of alongwind dispersion of clouds were collected from 11 field sites and from one wind tunnel and were used to test simple similarity relations. Because most of the observations consist of concentration time series from fixed monitors, the basic observed variable is σt, the standard deviation of the concentration time series. The observed σts range from 0.3 to 9000 s. The concentration time series observations also allow the travel time t from source to receptor to be estimated, from which the cloud advective speed ue can be determined. Observed ts range from 2 to 40 000 s, and observed ues range from 0.5 to 16 m s−1. The alongwind dispersion coefficient σx is then calculated from ueσt. The resulting σt and σx observations support the similarity relations σt = 0.1t and σx = 2u∗t, where u∗ is friction velocity. About 50% of the observations are within a factor of 2 of these similarity relations.

Corresponding author address: Dr. Steven R. Hanna, CSI MS 5C3, 103 Science and Technology I, George Mason University, 4400 University Drive, Fairfax, VA 22030-4444.

Abstract

Observations of alongwind dispersion of clouds were collected from 11 field sites and from one wind tunnel and were used to test simple similarity relations. Because most of the observations consist of concentration time series from fixed monitors, the basic observed variable is σt, the standard deviation of the concentration time series. The observed σts range from 0.3 to 9000 s. The concentration time series observations also allow the travel time t from source to receptor to be estimated, from which the cloud advective speed ue can be determined. Observed ts range from 2 to 40 000 s, and observed ues range from 0.5 to 16 m s−1. The alongwind dispersion coefficient σx is then calculated from ueσt. The resulting σt and σx observations support the similarity relations σt = 0.1t and σx = 2u∗t, where u∗ is friction velocity. About 50% of the observations are within a factor of 2 of these similarity relations.

Corresponding author address: Dr. Steven R. Hanna, CSI MS 5C3, 103 Science and Technology I, George Mason University, 4400 University Drive, Fairfax, VA 22030-4444.

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  • Biltoft, C., 1997: Phase I of DSWA transport and dispersion model validation study. DPG-FR-97-058, 156 pp. [Available from Meteorology and Obscurant Division, West Desert Test Center, U.S. Army Dugway Proving Ground, Dugway, UT 84022-5000.].

  • ——, 1998: Dipole Pride 26: Phase II of DSWA transport and dispersion model validation study. DPG-FR-98-001, 130 pp. [Available from Meteorology and Obscurant Division, West Desert Test Center, U.S. Army Dugway Proving Ground, Dugway, UT 84022-5000.].

  • ——, S. D. Turley, T. B. Watson, G. H. Crescenti, and R. G. Carter, 1999: Over-Land Atmospheric Dispersion (OLAD) test summary and analysis. WDTC Doc. WDTC/JCP-99/048, 38 pp. [Available from Meteorology and Obscurant Division, West Desert Test Center, U.S. Army Dugway Proving Ground, Dugway, UT 84022-5000.].

  • Bowers, J. F., G. E. Start, R. G. Carter, T. B. Watson, K. L. Clawson, and T. L. Crawford, 1994: Experimental design and results for the Long-Range Overwater Diffusion (LROD) Experiment. DPG/JCP-94/012, 531 pp. [Available from Meteorology and Obscurant Division, West Desert Test Center, U.S. Army Dugway Proving Ground, Dugway, UT 84022-5000.].

  • Chatwin, P. C., 1968: The dispersion of a puff of passive contaminant in the constant stress region. Quart. J. Roy. Meteor. Soc.,94, 350–360.

  • Coulombe, W., J. Bowen, R. Egami, D. Freeman, D. Sheesley, J. Nordin, T. Routh, and B. King, 1998: Characterization of carbon dioxide releases—Experiment 2. Rep. 97-7240.1D, 173 pp. [Available from Desert Research Institute, University and Community College System of Nevada, P.O. Box 60220, Reno, NV 89506.].

  • Csanady, G. T., 1969: Diffusion in an Ekman layer. J. Atmos. Sci.,26, 414–426.

  • Draxler, R. R., 1979: Some observations of the along-wind dispersion parameter. Proc. Fourth Symp. on Turbulence, Duffusion, and Air Pollution, Reno, NV, Amer. Meteor. Soc., 5–8.

  • Gifford, F. A., 1989: The shape of large tropospheric clouds, or “very like a whale.” Bull. Amer. Meteor. Soc.,70, 468–475.

  • ——, 1995: Some recent long-range diffusion observations. J. Appl. Meteor.,34, 1727–1730.

  • Hanna, S. R., and K. W. Steinberg, 1996: Studies of dense gas dispersion from short-duration transient releases over rough surfaces during stable conditions. Air Pollution Modeling and Its Applications XI, Plenum Press, 481–490.

  • ——, and J. C. Chang, 1999: Testing of the HEGADAS model using the Kit Fox field data. Proc. Int. Conf. and Workshop on Modeling the Consequences of Accidental Releases of Hazardous Materials. San Francisco, CA, American Institute of Chemical Engineers, 229–246.

  • Heffter, J. J., 1965: The variation of horizontal diffusion patterns with time for travel periods of one hour or longer. J. Appl. Meteor.,4, 153–160.

  • Hilst, G. R., and N. E. Bowne, 1966: A study of the diffusion of aerosols released from aerial line sources upwind of an urban complex. Vols. I and II. Rep. DA-42-007-AMC-38(R), 231 and 583 pp. [Available from The Traveler’s Research Center Inc., 250 Constitution Plaza, Hartford, CT 06103.].

  • Nickola, P. W., J. D. Ludwick, and J. V. Ramsdell Jr., 1970a: An inert gas tracer system for monitoring the real-time history of a diffusing plume or puff. J. Appl. Meteor.,9, 621–626.

  • ——, J. V. Ramsdell Jr., and J. D. Ludwick, 1970b: Detailed time-histories of concentrations resulting from puff and short-period releases of an inert radioactive gas: A volume of atmospheric diffusion data. BNWL-1272, UC-53, 193 pp. [Available from Battelle Memorial Institute, Pacific Northwest Laboratories, Battelle Boulevard, P.O. Box 999, Richland, WA 99352.].

  • Pasquill, F., 1969: The influence of the turning of wind with height on crosswind diffusion. II. Meteorological aspects of air pollution. Philos. Trans. Roy. Soc. London A,265, 173–181.

  • Robins, A. G., and J. E. Fackrell, 1998: An experimental study of the dispersion of short-duration emissions in a turbulent boundary layer. Air Pollution VI, C. A. Brebbia, C. F. Ratto, and H. Powers, Eds., WIT Press, 697–707.

  • Saffman, P. G., 1962: The effect of wind-shear on horizontal spread from an instantaneous ground source. Quart. J. Roy. Meteor. Soc.,88, 382–393.

  • Sato, J., 1995: An analytical study on longitudinal diffusion in the atmospheric boundary layer. Geophys. Mag. Ser. 2,1, 105–151.

  • ——, F. Kimura, and T. Yoshikawa, 1981: The longitudinal spread of puff in the short range diffusion experiment. Pap. Meteor. Geophys.,32, 155–162.

  • Smith, F. B., 1965: The role of wind shear in horizontal diffusion of ambient particles. Quart. J. Roy. Meteor. Soc.,91, 318–329.

  • ——, 1998: Estimating the statistics of risk from a hazardous source at long range. Atmos. Environ.,32, 2775–2791.

  • Smith, T. B., and R. L. Miller, 1966: Victoria diffusion trials. Vol. I. MRI-66-FR-374, 181 pp. [Available from Meteorological Research Inc., 464 West Woodbury Rd., Altadena, CA 91001.].

  • ——, and B. L. Niemann, 1969: Shoreline diffusion program, Oceanside, CA. Vols. I and II. MRI-64-FR-860, 230 and 456 pp. [Available from Meteorological Research Inc., 464 West Woodbury Rd., Altadena, CA 91001.].

  • Sykes, R. I., and D. S. Henn, 1995: Representation of velocity gradient effects in a Gaussian puff model. J. Appl. Meteor.,34, 2715–2723.

  • ——, ——, S. F. Parker, and R. S. Gabruk, 1996: SCIPUFF—a generalized hazard dispersion model. Ninth Joint Conf. on the Applications of Air Pollution Meteorology, Atlanta, GA, Amer. Meteor. Soc., 184–188.

  • Taylor, G. I., 1953: Dispersion of soluble matter in solvent flowing slowly through a tube. Proc. Roy. Soc. A,219, 186–203.

  • van Ulden, A. P., 1992: A surface-layer similarity model for the dispersion of a skewed passive puff near the ground. Atmos. Environ.,26A, 681–692.

  • Watson, T. B, R. E. Keislar, B. Reese, D. H. George, and C. A. Biltoft, 1998: The DSWA Dipole Pride 26 field experiment. NOAA Tech. Memo. ERL ARL-225, 90 pp. [Available from NOAA Air Resources Laboratory ARL, R/E/AR, SSMC 3, Room 3151, 1315 East–West Highway, Silver Spring, MD 20910.].

  • Western Research Institute, 1998: Final report on the 1995 Kit Fox Project. Vol. 1, Experimental description and data Processing, and Vol. 2, Data analysis for enhanced roughness test, Rep. WRI 98-7, 109 and 67 pp. [Available from WRI, 365 North Ninth St., Laramie, WY 82072-3380.].

  • Wilson, D. J., 1981: Along-wind diffusion of source transients. Atmos. Environ.,15, 489–495.

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