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首页> 外文期刊>Building and Environment >Identification of pedestrian-level ventilation corridors in downtown Beijing using large-eddy simulations
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Identification of pedestrian-level ventilation corridors in downtown Beijing using large-eddy simulations

机译：北京市北京市北京市行人级通风走廊的识别用大涡模拟

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摘要

Ventilation corridor, which is defined as air path that is composed of urban open spaces with low aerodynamic roughness and airflow resistance, has been discussed in Beijing previously. This study links up with different scales of ventilation characteristics in Beijing using multi-scale numerical simulations. Validated Weather Research and Forecasting simulations demonstrate the spatial wind patterns in two seasons and the impact of urban roughness on wind speed. Combined with a Lagrangian backward trajectory model, boundary layer ventilation corridors of Beijing are identified. To provide more fundamental and precise supporting information to tackle the complexity of ventilation environment in the capital city, a set of building-resolved large-eddy simulations (LES) was conducted. Each simulation covers a neighbourhood of 3 km by 3 km and the combined model domain covers the major part of downtown Beijing. Urban canopy ventilation and the influences of urban parameters are investigated. A multiple linear regression model between site-averaged velocity ratios and morphological parameters including building coverage ratio, frontal area index, and building volume is established to identify the importance of different urban factors. Open spaces in urban areas play an important role in urban ventilation. Pedestrian-level ventilation corridors are identified by combining all LES-computed velocity ratios in downtown Beijing. For both annual prevailing (South-south-west) and winter prevailing (North-northwest) winds, three pedestrian-level ventilation corridors were identified. Land use on the upstream and along these corridors should be protected for climatic and environmental enhancement.
机译：在北京之前讨论了通风走廊，该走廊被定义为由具有低空气动力粗糙度和气流抗性的城市开放空间组成的空气道路。本研究通过多尺度数值模拟，北京的不同通风特性尺度的联系。验证的天气研究和预测模拟展示了两个季节的空间风图案和城市粗糙度对风速的影响。结合着拉格朗日落后轨迹模型，识别北京的边界层通风走廊。为提供更基本和精确的支持信息来解决首都城市通风环境的复杂性，进行了一系列建筑解决的大涡模拟（LES）。每个模拟覆盖3公里的街区3公里，综合模型领域覆盖了北京市中心的主要部分。调查了城市结构的透气和城市参数的影响。建立了包括建筑覆盖率，正面区域指数和建筑物的站点平均速度比和形态参数之间的多元线性回归模型，以确定不同城市因素的重要性。城市地区的开放空间在城市通风中发挥着重要作用。通过将所有LES计算的速度比结合在北京市中心的所有LES计算的速度比来确定行人级通风走廊。对于年度普遍（南南）和冬季普遍存在（北 - 西北）风，确定了三条行人级通风走廊。应保护上游和沿着这些走廊的土地使用，以保护气候和环境提升。

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  • 来源
    《Building and Environment》 |2020年第9期|107169.1-107169.15|共15页
  • 作者

    Wang Weiwen; Yang Tushi; Li Yanni; Xu Yuepeng; Chang Ming; Wang Xuemei;

  • 作者单位

    Jinan Univ Inst Environm & Climate Res Guangzhou 511443 Peoples R China|Guangdong Hongkong Macau Joint Lab Collaborat Inn Guangzhou 511443 Peoples R China;

    Jinan Univ Inst Environm & Climate Res Guangzhou 511443 Peoples R China|Guangdong Hongkong Macau Joint Lab Collaborat Inn Guangzhou 511443 Peoples R China;

    Jinan Univ Inst Environm & Climate Res Guangzhou 511443 Peoples R China|Guangdong Hongkong Macau Joint Lab Collaborat Inn Guangzhou 511443 Peoples R China;

    Jinan Univ Inst Environm & Climate Res Guangzhou 511443 Peoples R China|Guangdong Hongkong Macau Joint Lab Collaborat Inn Guangzhou 511443 Peoples R China;

    Jinan Univ Inst Environm & Climate Res Guangzhou 511443 Peoples R China|Guangdong Hongkong Macau Joint Lab Collaborat Inn Guangzhou 511443 Peoples R China;

    Jinan Univ Inst Environm & Climate Res Guangzhou 511443 Peoples R China|Guangdong Hongkong Macau Joint Lab Collaborat Inn Guangzhou 511443 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ventilation corridor; Large-eddy simulation; Velocity ratio; Neighbourhood-scale; Beijing;

    机译：通风走廊;大涡模拟;速度比;邻里级;北京;

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