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    Simulation of Tracer Concentration Data in the Brush Creek Drainage Flow Using an Integrated Puff Model

    Source: Journal of Applied Meteorology:;1989:;volume( 028 ):;issue: 007::page 609
    Author:
    Rao, K. Shankar
    ,
    Eckman, Richard M.
    ,
    Hosker, Rayford P.
    DOI: 10.1175/1520-0450(1989)028<0609:SOTCDI>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: During the 1984 ASCOT field study in Brush Creek Valley, two perfluorocarbon tracers were released into the nocturnal drainage flow at two different heights. The resulting surface concentrations were sampled at 90 sites, and vertical concentration profiles at 11 sites. These detailed tracer measurements provide a valuable dataset for developing and testing models of pollutant transport and dispersion in valleys. In this paper, we present the results of Gaussian puff model simulations of the tracer releases in Brush Creek Valley. The model was modified to account for the restricted lateral dispersion in the valley, and for the gross elevation differences between the release site and the receptors. The variable wind fields needed to transport the puffs were obtained by interpolation between wind profiles measured using tethered balloons at five along-valley sites. Direct turbulence measurements were used to estimate diffusion. Subsidence in the valley flow was included for elevated releases. Two test simulations?covering different nights, tracers, and release heights?were performed. The predicted hourly concentrations were compared with observations at 51 ground-level locations. At most sites, the predicted and observed concentrations agree within a factor of 2 to 6. For the elevated release simulation, the observed mean concentration is 40 pL/L, the predicted mean is 21 pL/L, the correlation coefficient between the observed and predicted concentrations is 0.24, and the index of agreement is 0.46. For the surface release simulation, the observed mean is 85 pL/L, and the predicted mean is 73 pL/L. The correlation coefficient is 0.23, and the index of agreement is 0.42. The results suggest that this modified puff model can be used as a practical tool for simulating pollutant transport and dispersion in deep valleys.
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      Simulation of Tracer Concentration Data in the Brush Creek Drainage Flow Using an Integrated Puff Model

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4146692
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    • Journal of Applied Meteorology

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    contributor authorRao, K. Shankar
    contributor authorEckman, Richard M.
    contributor authorHosker, Rayford P.
    date accessioned2017-06-09T14:02:45Z
    date available2017-06-09T14:02:45Z
    date copyright1989/07/01
    date issued1989
    identifier issn0894-8763
    identifier otherams-11461.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4146692
    description abstractDuring the 1984 ASCOT field study in Brush Creek Valley, two perfluorocarbon tracers were released into the nocturnal drainage flow at two different heights. The resulting surface concentrations were sampled at 90 sites, and vertical concentration profiles at 11 sites. These detailed tracer measurements provide a valuable dataset for developing and testing models of pollutant transport and dispersion in valleys. In this paper, we present the results of Gaussian puff model simulations of the tracer releases in Brush Creek Valley. The model was modified to account for the restricted lateral dispersion in the valley, and for the gross elevation differences between the release site and the receptors. The variable wind fields needed to transport the puffs were obtained by interpolation between wind profiles measured using tethered balloons at five along-valley sites. Direct turbulence measurements were used to estimate diffusion. Subsidence in the valley flow was included for elevated releases. Two test simulations?covering different nights, tracers, and release heights?were performed. The predicted hourly concentrations were compared with observations at 51 ground-level locations. At most sites, the predicted and observed concentrations agree within a factor of 2 to 6. For the elevated release simulation, the observed mean concentration is 40 pL/L, the predicted mean is 21 pL/L, the correlation coefficient between the observed and predicted concentrations is 0.24, and the index of agreement is 0.46. For the surface release simulation, the observed mean is 85 pL/L, and the predicted mean is 73 pL/L. The correlation coefficient is 0.23, and the index of agreement is 0.42. The results suggest that this modified puff model can be used as a practical tool for simulating pollutant transport and dispersion in deep valleys.
    publisherAmerican Meteorological Society
    titleSimulation of Tracer Concentration Data in the Brush Creek Drainage Flow Using an Integrated Puff Model
    typeJournal Paper
    journal volume28
    journal issue7
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/1520-0450(1989)028<0609:SOTCDI>2.0.CO;2
    journal fristpage609
    journal lastpage616
    treeJournal of Applied Meteorology:;1989:;volume( 028 ):;issue: 007
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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