Study On The Optimization Of Urban Green Space In Beijing Urban Area Based On The Improvement Of Summer Microclimate

Continued urban expansion challenges human social development and ecological protection needs,and the resulting urban ecological problems are gaining further attention.Urban microclimate is an important part of human environment,urban ecological environment,suitable planning and design is to improve the microclimate environment.In this paper,based on the urban summer microclimate as the starting point,this paper aims to sort out the theory of microclimate and green space in the city,and combine the research of urban green space in Beijing city,and use the urban microclimate simulation software ENVI-MET to analyze the microclimate Based on the data analysis,this paper discusses the influence of the urban green space pattern on the urban summer microclimate,studies the summer microclimate characteristics of the different green space pattern,and finally uses the software simulation method to optimize the green space pattern based on microclimate Strategy.Through the investigation and study of the urban blocks in Beijing,the types and characteristics of the greenbelt pattern in Beijing urban district are summarized and the factors affecting the formation of the urban green space are obtained.The five types of greenbelt patterns are obtained,namely,green enclosure type,building type,parallel type,interspersed Type,mixed dispersion type.The measured and simulated results show that the temperature change of each measurement point in the different green space pattern is the biggest in the summer of July and August in Beijing.The architectural enclosures are the most affected by the architectural shadows.The parallel green space The mixed green space has the least effect on the rising of the temperature.The temperature of the interspersed green space is better than that of the parallel and green type.In the relative humidity,the relative humidity of the greening enclosing green space is obviously higher than other types;the building type is affected by the influence of the building shadow and the ventilation effect is not conducive to the cooling and humidification;the parallel green space ventilation effect is good,Humidity stability has an impact;scattered type,interspersed green space due to scattered green,is not conducive to humidification.In the wind speed,wind speed and building arrangement of strong,between the formation of a relatively stable speed between the canyon wind,two buildings at the top of the obvious wind speed growth.Based on the comparison and analysis of the simulation results of three typical green space patterns of parallel type,building type and green enclosure type,the corresponding scheme of street green space pattern optimization is put forward.In the choice of green space pattern,should choose a good type of green space ventilation.Building around the green space by the building around the green space in a closed state,hinder the wind into the venue,resulting in poor ventilation inside the venue,resulting in the activities of the site temperature is too high,the relative humidity of the phenomenon.Second,the venue to ensure that the amount of green,green for the warm and humid environment,the wind environment regulation is obvious;combined with the summer direction and the layout of the layout of the building,a reasonable set of walking trails,paving the location of the site to ensure the ventilation of the site to promote the air exchange within the venue Finally,the water is set on the north side of the site.The water body can compensate for the increased humidity due to the increase of the wind speed.However,the water body itself has the effect of temperature and humidity.It should be a distance from the active site,so that the whole microclimate can be adjusted at the same time.Their own on the environment brought about by the hot and humid.