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A Numerical Study of Downbursts Using the BLASIUS Model.

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Title: A Numerical Study of Downbursts Using the BLASIUS Model.
Authors: Liu, Hongchao1 (AUTHOR), Huang, Qian1 (AUTHOR) qianhuang@lzu.edu.cn, Chou, Yan1 (AUTHOR), Tian, Hongying1 (AUTHOR), Zhang, Yunshuai1 (AUTHOR), Wu, Xixi2 (AUTHOR), Zhang, Junxia3 (AUTHOR), Wang, Minzhong4 (AUTHOR)
Source: Journal of Applied Meteorology & Climatology. Aug2022, Vol. 61 Issue 8, p1065-1076. 12p. 4 Charts, 9 Graphs.
Subjects: Microbursts, Fronts (Meteorology), Wind shear, Boundary layer (Aerodynamics), Froude number
Geographic Terms: China
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. Significance Statement: Downbursts have the potential to cause significant damage to building structures and agricultural production and to cause unpredictable serious disasters. It is particularly important to understand the structure and evolution of downbursts. In addition, the influence of the topography on the structure and intensity of turbulent vortices during a downburst remain unclear. The results show that the Boundary Layer Above Stationary, Inhomogeneous Uneven Surface (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. The scale of the hill affects the dynamic and thermodynamic structures of the downburst through obstruction and entrainment mixing. The Froude number generally decreases as the height of the hill increases, and the downburst can pass over the hill. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Applied Meteorology & Climatology is the property of American Meteorological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: A Numerical Study of Downbursts Using the BLASIUS Model.
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  Data: <searchLink fieldCode="AR" term="%22Liu%2C+Hongchao%22">Liu, Hongchao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Huang%2C+Qian%22">Huang, Qian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> qianhuang@lzu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Chou%2C+Yan%22">Chou, Yan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tian%2C+Hongying%22">Tian, Hongying</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Yunshuai%22">Zhang, Yunshuai</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Xixi%22">Wu, Xixi</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Junxia%22">Zhang, Junxia</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Minzhong%22">Wang, Minzhong</searchLink><relatesTo>4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Applied+Meteorology+%26+Climatology%22">Journal of Applied Meteorology & Climatology</searchLink>. Aug2022, Vol. 61 Issue 8, p1065-1076. 12p. 4 Charts, 9 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Microbursts%22">Microbursts</searchLink><br /><searchLink fieldCode="DE" term="%22Fronts+%28Meteorology%29%22">Fronts (Meteorology)</searchLink><br /><searchLink fieldCode="DE" term="%22Wind+shear%22">Wind shear</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+layer+%28Aerodynamics%29%22">Boundary layer (Aerodynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Froude+number%22">Froude number</searchLink>
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  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22China%22">China</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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. Significance Statement: Downbursts have the potential to cause significant damage to building structures and agricultural production and to cause unpredictable serious disasters. It is particularly important to understand the structure and evolution of downbursts. In addition, the influence of the topography on the structure and intensity of turbulent vortices during a downburst remain unclear. The results show that the Boundary Layer Above Stationary, Inhomogeneous Uneven Surface (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. The scale of the hill affects the dynamic and thermodynamic structures of the downburst through obstruction and entrainment mixing. The Froude number generally decreases as the height of the hill increases, and the downburst can pass over the hill. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Applied Meteorology & Climatology is the property of American Meteorological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1175/JAMC-D-21-0243.1
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 12
        StartPage: 1065
    Subjects:
      – SubjectFull: Microbursts
        Type: general
      – SubjectFull: Fronts (Meteorology)
        Type: general
      – SubjectFull: Wind shear
        Type: general
      – SubjectFull: Boundary layer (Aerodynamics)
        Type: general
      – SubjectFull: Froude number
        Type: general
      – SubjectFull: China
        Type: general
    Titles:
      – TitleFull: A Numerical Study of Downbursts Using the BLASIUS Model.
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          Name:
            NameFull: Liu, Hongchao
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            NameFull: Huang, Qian
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            NameFull: Chou, Yan
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            NameFull: Tian, Hongying
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            NameFull: Zhang, Yunshuai
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            NameFull: Wu, Xixi
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            NameFull: Zhang, Junxia
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            NameFull: Wang, Minzhong
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            – D: 01
              M: 08
              Text: Aug2022
              Type: published
              Y: 2022
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            – TitleFull: Journal of Applied Meteorology & Climatology
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