...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Atmosphere >Ventilation and Air Quality in City Blocks Using Large-Eddy Simulation—Urban Planning Perspective
【24h】

Ventilation and Air Quality in City Blocks Using Large-Eddy Simulation—Urban Planning Perspective

机译：大涡模拟在城市街区​​的通风和空气质量-城市规划的视角

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Buildings and vegetation alter the wind and pollutant transport in urban environments. This comparative study investigates the role of orientation and shape of perimeter blocks on the dispersion and ventilation of traffic-related air pollutants, and the street-level concentrations along a planned city boulevard. A large-eddy simulation (LES) model PALM is employed over a highly detailed representation of the urban domain including street trees and forested areas. Air pollutants are represented by massless and passive particles (non-reactive gases), which are released with traffic-related emission rates. High-resolution simulations for four different city-block-structures are conducted over a 8.2 km 2 domain under two contrasting inflow conditions with neutral and stable atmospheric stratification corresponding the general and wintry meteorological conditions. Variation in building height together with multiple cross streets along the boulevard improves ventilation, resulting in 7–9% lower mean concentrations at pedestrian level. The impact of smaller scale variability in building shape was negligible. Street trees further complicate the flow and dispersion. Notwithstanding the surface roughness, atmospheric stability controls the concentration levels with higher values under stably stratified inflow. Little traffic emissions are transported to courtyards. The results provide urban planners direct information to reduce air pollution by proper structural layout of perimeter blocks.
机译：建筑物和植被改变了城市环境中的风和污染物运输。这项比较研究调查了周边街区的方向和形状在与交通相关的空气污染物的扩散和通风以及规划的城市林荫大道上街道浓度方面的作用。大涡模拟（LES）模型PALM用于包括街道树木和森林地区在内的城市区域的高度详细表示。空气污染物以无质量和无源颗粒（非反应性气体）为代表，并随交通相关的排放速率释放。在两个相反的流入条件下，在中性和稳定的大气分层对应于一般和寒冷的气象条件下，在8.2 km 2的区域上对四种不同的城市街区结构进行了高分辨率模拟。建筑高度的变化以及沿林荫大道的多个交叉街道改善了通风，导致行人水平的平均浓度降低了7–9％。较小的比例变化对建筑物形状的影响可以忽略不计。街头树木进一步加剧了流量和分散性。尽管表面粗糙，但在稳定的分层入流条件下，大气稳定性会控制较高的浓度水平。很少有交通排放物被运送到庭院。结果为城市规划者提供了直接信息，可通过适当的周边区域结构布局来减少空气污染。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号