廖孙策, 黄铭枫, 楼文娟, 等. 台风“山竹”影响下的城市风场数值模拟研究[J]. 空气动力学学报, 2021, 39(4): 107−116. doi: 10.7638/kqdlxxb-2021.0048
引用本文: 廖孙策, 黄铭枫, 楼文娟, 等. 台风“山竹”影响下的城市风场数值模拟研究[J]. 空气动力学学报, 2021, 39(4): 107−116. doi: 10.7638/kqdlxxb-2021.0048
LIAO S C, HUANG M F, LOU W J, et al. Numerical simulation of a urban wind field under the influence of typhoon “Mangkhut”[J]. Acta Aerodynamica Sinica, 2021, 39(4): 107−116. doi: 10.7638/kqdlxxb-2021.0048
Citation: LIAO S C, HUANG M F, LOU W J, et al. Numerical simulation of a urban wind field under the influence of typhoon “Mangkhut”[J]. Acta Aerodynamica Sinica, 2021, 39(4): 107−116. doi: 10.7638/kqdlxxb-2021.0048

台风“山竹”影响下的城市风场数值模拟研究

Numerical simulation of a urban wind field under the influence of typhoon “Mangkhut”

  • 摘要: 基于中尺度气象模式(weather research and forecasting,WRF),对2018年第1822号超强台风“山竹”影响期间深圳气象观测梯度塔附近城市风场开展了数值模拟研究,并结合气象观测塔的现场实测数据进行比较验证。采用移动嵌套网格模拟得到了台风“山竹”的演化过程;耦合城市冠层模型(urban canopy model,UCM)完成了城市台风风场的多尺度精细化模拟;分析了城市冠层模型对WRF模式城市风场模拟精度的影响。基于UCM模型和高精度的下垫面数据,准确模拟出了台风影响下的风场空间分布情况;数值模拟得到的深圳气象梯度塔位置不同高度处台风风速结果与现场实测数据吻合较好,表明耦合UCM模型的WRF模拟能够较为精确地捕捉到台风过境时的城市风场特性。与未耦合UCM模型的WRF模拟结果相比,UCM模型的采用进一步提高了城市台风风场近地面风速的模拟精度。

     

    Abstract: Based on the WRF (weather research and forecasting) model, a numerical simulation of a typhoon wind field near the Shenzhen meteorological observation gradient tower has been carried out for super typhoon “Mangkhut”. Field measurement data at the Shenzhen meteorological observation tower are used for verification. A moving nested mesh is employed to reproduce the evolution of typhoon “Mangkhut”, and the UCM (urban canopy model) is incorporated into the simulation to resolve the multi-scale urban wind field. The spatial distribution of the urban wind field under the influence of the typhoon has been accurately simulated with the aid of the UCM and high-resolution geographical data. The hilly terrain in the city leads to an uneven distributed wind field. The numerically obtained typhoon wind speeds at several heights at the Shenzhen meteorological observation gradient tower agree well with the observed data, indicating that the WRF simulation coupled with UCM could effectively capture the characteristics of urban wind fields when a typhoon passes through. In addition, compared with a WRF simulation without the UCM, it is demonstrated that the numerical accuracy of near-surface wind velocity can be considerably improved by the UCM.

     

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