A Numerical Study of Downbursts Using the BLASIUS ModelSource: Journal of Applied Meteorology and Climatology:;2022:;volume( 061 ):;issue: 008::page 1065Author:Hongchao Liu
,
Qian Huang
,
Yan Chou
,
Hongying Tian
,
Yunshuai Zhang
,
Xixi Wu
,
Junxia Zhang
,
Minzhong Wang
DOI: 10.1175/JAMC-D-21-0243.1Publisher: 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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contributor author | Hongchao Liu | |
contributor author | Qian Huang | |
contributor author | Yan Chou | |
contributor author | Hongying Tian | |
contributor author | Yunshuai Zhang | |
contributor author | Xixi Wu | |
contributor author | Junxia Zhang | |
contributor author | Minzhong Wang | |
date accessioned | 2023-04-12T18:24:24Z | |
date available | 2023-04-12T18:24:24Z | |
date copyright | 2022/08/01 | |
date issued | 2022 | |
identifier other | JAMC-D-21-0243.1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4289606 | |
description 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. | |
publisher | American Meteorological Society | |
title | A Numerical Study of Downbursts Using the BLASIUS Model | |
type | Journal Paper | |
journal volume | 61 | |
journal issue | 8 | |
journal title | Journal of Applied Meteorology and Climatology | |
identifier doi | 10.1175/JAMC-D-21-0243.1 | |
journal fristpage | 1065 | |
journal lastpage | 1076 | |
page | 1065–1076 | |
tree | Journal of Applied Meteorology and Climatology:;2022:;volume( 061 ):;issue: 008 | |
contenttype | Fulltext |