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    A Numerical Study of Downbursts Using the BLASIUS Model

    Source: Journal of Applied Meteorology and Climatology:;2022:;volume( 061 ):;issue: 008::page 1065
    Author:
    Hongchao Liu
    ,
    Qian Huang
    ,
    Yan Chou
    ,
    Hongying Tian
    ,
    Yunshuai Zhang
    ,
    Xixi Wu
    ,
    Junxia Zhang
    ,
    Minzhong Wang
    DOI: 10.1175/JAMC-D-21-0243.1
    Publisher: American Meteorological Society
    Abstract: Downbursts can produce severe damage in near-ground areas and can also pose serious threats to aircraft in flight. In this study, a high-resolution boundary layer model—the Boundary Layer Above Stationary, Inhomogeneous Uneven Surface (BLASIUS) model—is used to simulate the evolution of a downburst. The observational data collected in Tazhong, China, located in hinterland of the Taklimakan Desert, during the Boundary Layer Comprehensive Observational Experiment on 27 July 2016 are used as the thermodynamic initial field for the BLASIUS model. In addition, the impacts of the terrain on the structure, turbulence intensity, and maximum wind speed of the downburst are also investigated. The results show that the BLASIUS model can simulate the structure and evolution characteristics of downbursts. The cold pool becomes warm if an isolated hill is implanted in the model under the same model conditions. Both the movement speed of the head and the average wind speed of the downburst decrease, while the maximum wind speed increases. The scale of the hill affects the dynamic and thermodynamic structures of the downburst through obstruction and entrainment mixing. The maximum wind speeds occur on the windward slope, and the downburst passes over the hill in the various tests with a hill. The head of the cold pool becomes narrow and tall for larger hill width cases. The Froude number generally decreases as the height of the hill increases, and the downburst can pass over the hill. The results are helpful to improve our understanding of the effects that terrain blocking on downburst structure and near-ground wind shear.
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      A Numerical Study of Downbursts Using the BLASIUS Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4289606
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    • Journal of Applied Meteorology and Climatology

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    contributor authorHongchao Liu
    contributor authorQian Huang
    contributor authorYan Chou
    contributor authorHongying Tian
    contributor authorYunshuai Zhang
    contributor authorXixi Wu
    contributor authorJunxia Zhang
    contributor authorMinzhong Wang
    date accessioned2023-04-12T18:24:24Z
    date available2023-04-12T18:24:24Z
    date copyright2022/08/01
    date issued2022
    identifier otherJAMC-D-21-0243.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4289606
    description abstractDownbursts can produce severe damage in near-ground areas and can also pose serious threats to aircraft in flight. In this study, a high-resolution boundary layer model—the Boundary Layer Above Stationary, Inhomogeneous Uneven Surface (BLASIUS) model—is used to simulate the evolution of a downburst. The observational data collected in Tazhong, China, located in hinterland of the Taklimakan Desert, during the Boundary Layer Comprehensive Observational Experiment on 27 July 2016 are used as the thermodynamic initial field for the BLASIUS model. In addition, the impacts of the terrain on the structure, turbulence intensity, and maximum wind speed of the downburst are also investigated. The results show that the BLASIUS model can simulate the structure and evolution characteristics of downbursts. The cold pool becomes warm if an isolated hill is implanted in the model under the same model conditions. Both the movement speed of the head and the average wind speed of the downburst decrease, while the maximum wind speed increases. The scale of the hill affects the dynamic and thermodynamic structures of the downburst through obstruction and entrainment mixing. The maximum wind speeds occur on the windward slope, and the downburst passes over the hill in the various tests with a hill. The head of the cold pool becomes narrow and tall for larger hill width cases. The Froude number generally decreases as the height of the hill increases, and the downburst can pass over the hill. The results are helpful to improve our understanding of the effects that terrain blocking on downburst structure and near-ground wind shear.
    publisherAmerican Meteorological Society
    titleA Numerical Study of Downbursts Using the BLASIUS Model
    typeJournal Paper
    journal volume61
    journal issue8
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAMC-D-21-0243.1
    journal fristpage1065
    journal lastpage1076
    page1065–1076
    treeJournal of Applied Meteorology and Climatology:;2022:;volume( 061 ):;issue: 008
    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
    yabeshDSpacePersian