Research On The Influence Of Residential Green Space Construction Mode On The Outdoor Wind Environment

Driven by the "Healthy China" development strategy and the construction of a high-quality residential environment,a comfortable and healthy outdoor environment has led the development direction of residential district area construction.Wind environment has always been an essential part of residential outdoor space.However,residential buildings may cause an unpleasant wind environment for residents’ outdoor activities and wind environment can be improved by plant.Therefore,how to create a comfortable and healthy wind environment has become an urgent problem in the planning and design of the green space in residential areas.In this paper,literature research,field measurement,software simulation and systematic cluster analysis are used to explore the impact of green space construction mode on the outdoor wind environment of multi-storey slab communities under the autumn wind of Beijing.The research obtained the green space construction mode through field investigation,and used it as a data basis to simulate the impact of green space layout and plant community characteristics on the outdoor wind environment of the community,and screened out the optimal green space as well as plant combination mode based on the wind comfort and health zone.The research conclusions are as follows:(1)Green space layout and the community characteristics of multi-storey slab communities in Beijing: The layout of green space in multi-storey slab communities in Beijing can be divided into three types: greening beside buildings,greening between buildings,and greening in squares.Among them,greening between buildings is categorized into north,middle and south greening between buildings according to their position with buildings.From the perspective of community characteristics,plant community uses a few species of high-frequency applications to form the landscape tone of the residential green space.The form and structure characteristics of the community are rich and diverse.(2)The impact of green space layout on the outdoor wind environment: as for the wind field distribution,greening beside buildings can effectively alleviate the angular flow area and the flow area across the building,but it has little effect on the overall outdoor wind environment of the residential area;greening between buildings shows the opposite effect.In terms of the area of the wind comfort and health zone,three layouts of north,north-middle,and north-south greening between buildings have the most obvious increasing influence.(3)The impact of community characteristics on the outdoor wind environment: the influence of layout characteristics is more obvious than the form and structure.The influence of form and structure depends on the specific indexes.Among kinds of characteristic indexes,layout,height,width and leaf area index of communities are important indexes that significantly affect the area of wind comfort and health zone in the residential area.The height under canopy and crown line of the communities have little impact on the wind comfort and health zone.Under the influence of green space layout,community characteristic index has different influence on wind environment.(4)Selection of the optimal green space and plant combination mode: Taking the wind comfort and health zone as a reference,select the optimal green space and plant combination mode—optimal north greening between buildings should be a combination of low shrubs and medium trees,or a combination of dense shrub;optimal middle greening between buildings is suitable for a combination of plants dominated by low shrubs;optimal south greening between buildings should use a combination of plants dominated by tall trees.