Research On Landscape Effect Factor Of The Wind Environment In Chengdu Street Canyon Based On Local Climate Zones

With the population growth and urbanization process,the trend of compact and high density development in urban areas is increasing.The urban heat island effect caused by compact high density and the urban static wind problem have become a huge threat to human health and energy consumption.In the urban heat island effect and calm wind environment,the street layer gorge as the main city public space is also the main ventilation corridor of the city,and its wind environment optimization is extremely important.Among the existing street gorges,green spaces are the most operationally important landscape factors that have a significant impact on the outdoor microclimate environment.However,based on the urban heat island effect and the calm wind environment,the research on the optimization effect of green space on the wind energy environment of the street layer is relatively lacking.In response to the above deficiencies,the following research was conducted.Firstly,the composition of the influence factors of the street gorge and its analysis points are established.Investigate and collect a large number of domestic and foreign literatures to sort out the influence factors of the wind energy in the street layer,and based on the three main effects of plants on the shading,evaporation and ventilation of the street layer,comprehensively analyze the urban street space type as the green factor in the street layer.Division basis.Secondly,the formation of the association between urban hot and cold islands and street gorges is formed.Based on the correlation analysis between urban form and urban heat island effect,it is determined that the surface temperature inversion and local climate division comprehensively reflect the distribution of urban hot and cold islands,and the street gorge connecting the urban hot and cold islands is selected by simulation comparison.The investigation and the above-mentioned elements of the influence factors of the street gorge are summarized,and the heat island effect,morphological elements and landscape elements of the street gorge in the hot and cold islands of Chengdu are summarized.Third,construct a comparative analysis of the model and the field measurement to test the accuracy of the simulation results.Based on the computer fluid dynamics principle,a FLUENT software platform is used to construct a city microclimate simulation model that reflects different underlying surface parameters of urban hot and cold islands,including plant canopy transpiration,ventilation and shading effects.The climatic environment provides more accurate analog values.According to the above parameters,the parameters of the urban hot and cold islands are analyzed,which indicates that the model demonstrates the importance of plant canopy as a micro-climate environment simulation design parameter,which can reflect the regional difference of urban hot and cold islands and more accurate.The ground represents the heat exchange of the local environment and the resulting air flow.Therefore,it can provide a more accurate verification path for micro-climate environment mediation optimization.Fourthly,through a large number of simulated numerical analysis,the influences of street trend,shade type and other factors on the wind environment inside and outside the gorge of the street layer are studied.The distribution law of wind environment in urban hot and cold islands and the optimization design of green space in street layer gorge environment are summarized..The study found that the distribution of wind environment in the hot and cold islands has certain regularity;it is found that different types of shades will have different effects on the winds and winds of the street layers.In most cases,the two rows of open shades are more conducive to street ventilation,but during the period.It is related to factors such as the direction of the street and the degree of closure of the canopy in the middle of the street.This paper provides a way of thinking about the correlation between street-green space-high-density city(quiet wind environment and heat island effect),and builds a more accurate prediction model by verifying the characteristic parameter setting;obtaining the wind environment of Chengdu hot and cold island area The distribution law and the optimization of green space design strategy for the wind energy environment in the street layer provide reference for high-density cities with similar urban environmental problems.