| 摘要: |
| 基于计算流体力学(CFD)模拟开展了一系列理想数值试验，分析了城市建成区的热力作用对局地环流的影响，模拟结果表明：在没有背景风的情况下，城市热岛效应可破坏海陆环流的固有转换模式，使近地面风场总是在城市建成区上空辐合；在有微弱背景风的情况下，热岛效应也会导致近地层风场出现线型辐合。而城市上空总是容易出现辐合风场，可部分解释城市局地高污染带形成的物理机制。 |
| 关键词: 城市热岛 海陆环流 局地环流 局地污染 CFD |
| DOI：10.16032/j.issn.1004-4965.2021.050 |
| 分类号: |
| 基金项目: |
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| CFD SIMULATION STUDY OF INFLUENCE OF THERMAL EFFECT OF COASTAL URBAN BUILT-UP AREAS ON LOCAL CIRCULATION |
|
LI Lei1,2,3
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1. School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China;2. Guangdong Provincial Observation and Research Station for Climate Environment and Air Quality Change in the
Pearl River Estuary, Zhuhai 519082, China;3. Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, Zhuhai 519082, China
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| Abstract: |
| Based on computational fluid dynamics (CFD) simulation, a series of ideal numerical experiments are carried out to analyze the influence of thermal effect of urban built-up area on local circulation. The results show that in the case of no background wind, urban heat island effect can destroy the inherent conversion mode of land-sea circulation and make wind field converge over urban built-up area; while in the case of weak background wind, urban heat island effect will also lead to line-shaped convergence in the wind field of surface layer. The analysis shows that the existence of urban built-up area will always cause the convergence of wind field near ground, which can partly explain the physical mechanism of local-scale heavy pollution. |
| Key words: urban heat island land sea circulation local-scale circulation local-scale pollution CFD |
