| Atmospheric particulate matter pollution is worsening, China has become one of the world's worst air pollution in the country; air quality map of the world, according to a NASA showed the highest global particle pollution in areas of North Africa as well as China's north, east and central of all, most of the average concentration of particulate matter in China is close to 80 micrograms /cubic meter, eight times beyond the World Health Organization under the relevant pollution indicators. Chinese Government Network on September 12,2013 public release "Atmospheric Pollution Prevention Action Plan":requirements after five years of efforts, the overall improvement in air quality in the country, the weather was a substantial reduction in heavy pollution; Beijing, Tianjin, the Yangtze River Delta, Pearl River Delta regional air quality improved markedly. These facts fully demonstrated China's current air particulate pollution prevention is facing unprecedented pressure, air particulate pollution prevention is not only important to the healthy development of the city to protect the environment, but also to ensure that the city has become a major social issue of public safety.City commercial district is using one of the highest frequency of public urban space, but also the most vulnerable to air pollutants in urban gathering space. The complexity of the built environment, people's diversity as well as the surge in vehicle ownership, so that the concentration of pollutants and pedestrian street near the building at the height of the sharp increase in respiration, which greatly exacerbated the city's commercial district dangers of air pollution. Thus, the commercial district of urban air particulate matter are often the hardest hit by pollution, air pollution control business district has gradually become an important issue in urgent need of the process of urbanization response. Current respirable particulate has become the primary air pollutants in our city, especially to the lungs of PM2.5, its prevention is not only to protect the healthy development of urban environmental problems, but also social problems affecting public safety, particularly in the construction space complex structure, a huge flow of people city business district, particularly affected.By analyzing the domestic and foreign research progress particulate pollution dispersion modeling methods respirable, according to the results of the diffusion study particles of respirable has been made under the influence of urban meteorological conditions, research commercial district space form, architectural space layout of the form, block building Underlying physical characteristics, sources of strength characteristics and other factors can have a significant impact on the spillover effects of respirable particulate matter. Characteristics of urban space layout for the commercial district, the spatial distribution of inhalable form of the city's commercial district under the influence of particulate matter PM2.5 discuss research. Numerical simulation technology, clear ambient air pollution dispersion mechanism respirable temporal and spatial distribution of particulate matter, respirable particulate matter proposed to control pollution and improve environmental quality of urban air commercial district space layout strategy. Sketchup with CAD and modeling software, to establish the basic model of the study area, the analysis of the study area-blocks to form Taiyuan Street, architectural space layout and other forms of spatial information; statistics respirable particulate matter of historical monitoring data, combined with field survey samples, coupling Analysis of meteorological elements and blocks the effects of urban environment on the underlying surface diffusion effects to determine model parameters set pollution; the use of computational fluid dynamics (such as FLUENT) software to block the horizontal and vertical patterns of respirable particle diffusion dynamic simulations to reveal the urban climatic characteristics of respirable particles diffusion range, characteristics and distribution of spatial variation proposed respirable particulate matter based on diffusion-controlled city commercial district space layout optimization methods.In this study, analyzed the Shenyang Taiyuan Street respirable diffusion distribution of particulate matter, by Taiyuan status quo Street analysis, extraction of the commercial district of typical spatial layout of the form, and conducted a study of optimization strategies, and then applied to the Shenyang Taiyuan Street overall spatial layout optimization strategy, the final proposed three optimization strategies. CFD technology and neighborhoods through fluent spatial layout design techniques combined results can be applied to the Northeast commercial district of the city related to renovation and design, urban commercial district and block proliferation of respirable particulate matter in space layout optimization instructive. |
PDF Full Text Request