Vertical Diffusion From an Elevated Line Source Over a Variety of Terrains - Part A

Smith, T. B.; Wolf, Mary Alice

doi:10.21236/ad0418599

Cited by 4 publications

(5 citation statements)

References 2 publications

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“…The tetroons were caught up in adjacent vortices and executed full helical cycles in opposite directions . Smith (1963) observed downward velocities of atmospheric tracers released aloft (500 to 1,000 feet MSL) at the shoreline to be 50 to 100 feet/minute during some tracer experiments.…”

Section: Kmmentioning

confidence: 84%

“…Hsu (1970) reported that the sea breeze has been observed to extend onshore for distances of tens of kilometers along the Gulf coast of southern Texas. In cases where the gradient wind flow is in the same direction as the sea breeze, the onshore winds may extend even further (Ettenheim, 1967;Smith, 1963). Topographic features affect the distance that a sea breeze extends inland.…”

Section: Figure Lmentioning

confidence: 99%

“…However, as Smith (1963) notes, such occurrences are difficult to observe quantitatively without unusual preparation and unusual techniques. The end result of such helical trajectories can be that emissions caught up into such a structure could be lifted above the ground surface and later brought back down to the surface at a location not only downwind but also off the angle of the expected trajectory.…”

Section: Ground Level Projectionmentioning

confidence: 99%

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Atmospheric transport and diffusion mechanisms in coastal circulation systems

Kaleel¹,

Shearer²,

MacRae³

1983

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Jr., the NRC technical contract monitor, served to focus the effort on NRC's particular needs in the area of atmospheric transport and diffusion in shoreline environments. Finally, the detailed review and helpful comments of Mr. c. G. Lindsey, also of the Geosciences Research and Engineer! ng Department at PNL is greatly appreciated. The contributions of Drs. Hadlock and Abbey and Mr. Lindsey are gratefully acknowledged. :iv

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Section: Kmmentioning

confidence: 84%

Section: Figure Lmentioning

confidence: 99%

Section: Ground Level Projectionmentioning

confidence: 99%

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Atmospheric transport and diffusion mechanisms in coastal circulation systems

Kaleel¹,

Shearer²,

MacRae³

1983

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“…They have been reported by McElroy and Pooler, 7 Hilst and Bowne, 8 Bowne, Smith, and Entrekin, 9 McMullen and Perkins, 10 Smith and Wolf, 11 McCready et al, n Hamilton, 13 Haugen and Fuquay, 14 Tourin and Shen, 15 Church et al, 16 Kangos et al, " and Taylor.…”

Section: Introductionmentioning

confidence: 83%

Diffusion Rates

Bowne¹

1974

Journal of the Air Pollution Control Association

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The Gaussian diffusion model has achieved considerable popularity among people attempting to describe the role of atmospheric dispersion. The ease of application of this model for conservative pollutants outweighs its shortcomings as a complete mathematical description of the diffusion process. Most engineers employing the model have used the classical dispersion rates originally designated by Pasquill and Gifford. Turner's Workbook has provided additional impetus tc use of this model, often by engineers not familiar with either the mathematics of the model or the experimental data used to determine the dispersion rates. The purpose of this paper is to provide a set of three families of dispersion curves, based on experimental data gathered since 1963, to yield dispersion rates appropriate to urban and suburban areas, as well as the rural areas appropriate to the Pasquill and Gifford curves. McElroy and Pooler's curves for urban rates are extended to shorter distances and a set of curves appropriate to suburban areas of heterogeneous topography are proposed.The Gaussian plume dispersion model is used by many engineers, environmentalists, and meteorologists to calculate concentration of contaminants in the atmosphere. It has achieved popularity because it is easy to use, most measured dispersion data fit the Gaussian model reasonably well and published dispersion coefficients have been available for twelve years.The curves used are not always appropriate to the situation in question. New dispersion coefficients based on later experimental programs conducted in irregular terrain and in urban areas are proposed in this paper. In addition, terrain, roughness and source wake effects are considered. These latter effects dominate the dispersion processes close to the source. Limited vertical mixing is accounted for at large distances in the proposed curves.

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“…An effort was made to compute vertical dispersion coefficients from these data by removing the effects of particle deposition, but the results of these efforts proved to be inconclusive, and are not included in this report. The dispersion of fluorescent particles was studied by Smith, et al (1963) in a variety of terrains. Aircraft were employed to release the tracer as an elevated line source during these tests.…”

Section: A-mentioning

confidence: 99%