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    Flow Regimes over a Basin Induced by Upstream Katabatic Flows—An Idealized Modeling Study

    Source: Journal of the Atmospheric Sciences:;2016:;Volume( 073 ):;issue: 010::page 3821
    Author:
    Lehner, Manuela
    ,
    Rotunno, Richard
    ,
    Whiteman, C. David
    DOI: 10.1175/JAS-D-16-0114.1
    Publisher: American Meteorological Society
    Abstract: dealized two-dimensional model simulations are performed to study the frequent nocturnal occurrence of downslope-windstorm-type flows in Arizona?s Meteor Crater. The model topography is a simplified representation of the Meteor Crater and its surroundings, with an approximately 1° mesoscale slope upstream and downstream of the crater basin. A strong surface-based inversion and a katabatic flow develop above the mesoscale slope as a result of radiational cooling. The temperature and flow profiles are evaluated against observations over low-angle slopes from two field campaigns, showing that the model?s turbulence parameterization has a strong impact on the near-surface conditions. The interaction of the katabatic flow with the basin topography leads to the formation of waves and hydraulic jumps over the basin. The simplified two-dimensional simulations show good qualitative agreement with observations of downslope-windstorm-type flows from the Meteor Crater. The sensitivity of the flow solution over the basin to basin depth, basin width, and background wind speed is investigated. The resulting flow regimes include a sweeping of the basin atmosphere, a wake over the upstream crater sidewall, waves over the basin with one or two wave crests, and a hydraulic jump. The regimes are discussed in the context of stratified flow over mountains.
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      Flow Regimes over a Basin Induced by Upstream Katabatic Flows—An Idealized Modeling Study

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4220179
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    contributor authorLehner, Manuela
    contributor authorRotunno, Richard
    contributor authorWhiteman, C. David
    date accessioned2017-06-09T16:59:46Z
    date available2017-06-09T16:59:46Z
    date copyright2016/10/01
    date issued2016
    identifier issn0022-4928
    identifier otherams-77602.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4220179
    description abstractdealized two-dimensional model simulations are performed to study the frequent nocturnal occurrence of downslope-windstorm-type flows in Arizona?s Meteor Crater. The model topography is a simplified representation of the Meteor Crater and its surroundings, with an approximately 1° mesoscale slope upstream and downstream of the crater basin. A strong surface-based inversion and a katabatic flow develop above the mesoscale slope as a result of radiational cooling. The temperature and flow profiles are evaluated against observations over low-angle slopes from two field campaigns, showing that the model?s turbulence parameterization has a strong impact on the near-surface conditions. The interaction of the katabatic flow with the basin topography leads to the formation of waves and hydraulic jumps over the basin. The simplified two-dimensional simulations show good qualitative agreement with observations of downslope-windstorm-type flows from the Meteor Crater. The sensitivity of the flow solution over the basin to basin depth, basin width, and background wind speed is investigated. The resulting flow regimes include a sweeping of the basin atmosphere, a wake over the upstream crater sidewall, waves over the basin with one or two wave crests, and a hydraulic jump. The regimes are discussed in the context of stratified flow over mountains.
    publisherAmerican Meteorological Society
    titleFlow Regimes over a Basin Induced by Upstream Katabatic Flows—An Idealized Modeling Study
    typeJournal Paper
    journal volume73
    journal issue10
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-16-0114.1
    journal fristpage3821
    journal lastpage3842
    treeJournal of the Atmospheric Sciences:;2016:;Volume( 073 ):;issue: 010
    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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