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    Numerical Simulation of Cross-Valley Plume Dispersion during the Morning Transition Period

    Source: Journal of Applied Meteorology:;1989:;volume( 028 ):;issue: 007::page 652
    Author:
    Bader, David C.
    ,
    Whiteman, C. David
    DOI: 10.1175/1520-0450(1989)028<0652:NSOCVP>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A two-dimensional dynamical model was used to simulate the daytime boundary-layer evolution and resulting plume dispersion in a cross-valley section of a northwest?southeast oriented narrow valley in the first 4 h after sunrise. Two cases were simulated, one using a summertime heating distribution and a second with a wintertime heating distribution. In each case, additional conservation equations were added to simulate the dispersion of two plumes released 150 m and 650 m above the valley floor. In the summer case, the lower plume migrated to the more strongly heated southwest sidewall in the first 90 min after sunrise, and was then advected up the sidewall in the slope flow for the remainder of the simulation. This result is consistent with observations. The upper plume diffused slowly in the remnants of the nocturnal inversion layer until it was entrained by the growing convective boundary layer 3 h after sunrise. The boundary layer's thermodynamic structure remained nearly symmetric about the valley axis throughout the transition period. The asymmetric dispersion characteristics seen in the summer case were not found in the winter simulation. The seasonal change in solar illumination reduced the differences in surface heat flux between the two sidewalls that gave rise to the asymmetry observed in the summer case.
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      Numerical Simulation of Cross-Valley Plume Dispersion during the Morning Transition Period

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4146696
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    contributor authorBader, David C.
    contributor authorWhiteman, C. David
    date accessioned2017-06-09T14:02:46Z
    date available2017-06-09T14:02:46Z
    date copyright1989/07/01
    date issued1989
    identifier issn0894-8763
    identifier otherams-11465.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4146696
    description abstractA two-dimensional dynamical model was used to simulate the daytime boundary-layer evolution and resulting plume dispersion in a cross-valley section of a northwest?southeast oriented narrow valley in the first 4 h after sunrise. Two cases were simulated, one using a summertime heating distribution and a second with a wintertime heating distribution. In each case, additional conservation equations were added to simulate the dispersion of two plumes released 150 m and 650 m above the valley floor. In the summer case, the lower plume migrated to the more strongly heated southwest sidewall in the first 90 min after sunrise, and was then advected up the sidewall in the slope flow for the remainder of the simulation. This result is consistent with observations. The upper plume diffused slowly in the remnants of the nocturnal inversion layer until it was entrained by the growing convective boundary layer 3 h after sunrise. The boundary layer's thermodynamic structure remained nearly symmetric about the valley axis throughout the transition period. The asymmetric dispersion characteristics seen in the summer case were not found in the winter simulation. The seasonal change in solar illumination reduced the differences in surface heat flux between the two sidewalls that gave rise to the asymmetry observed in the summer case.
    publisherAmerican Meteorological Society
    titleNumerical Simulation of Cross-Valley Plume Dispersion during the Morning Transition Period
    typeJournal Paper
    journal volume28
    journal issue7
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/1520-0450(1989)028<0652:NSOCVP>2.0.CO;2
    journal fristpage652
    journal lastpage664
    treeJournal of Applied Meteorology:;1989:;volume( 028 ):;issue: 007
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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