Landscape Design Of Climate-adaptive Green Spaces Beside Urban Streets

The world is experiencing the largest urbanization process in history and has a serious negative impact on the urban climate.The green space beside the street is the basis of the urban microclimate,and it is also the type of urban green space with the highest utilization rate of urban residents.It is of great significance to study the influence of the green space on the urban microclimate environment.For the research and analysis of the green space beside the city street,two ways are taken,that is,field investigation on site(including field instrument testing and filling out questionnaire);and the use of microclimate analysis software ENVI-met to simulate the site.The outdoor thermal environment(including wind environment,thermal environment and wet environment)of roadside green space is comprehensively evaluated through two ways.Sort out the four types of roadside green spaces and outdoor thermal environment and choose the best roadside green space in summer.The basic characteristics of summer microclimate in Xi'an's urban roadside green space and its relationship with related landscape elements are obtained.In this paper,two methods of data simulation and software simulation are adopted.The following conclusions are drawn:First,in the landscape garden elements that affect the green space near the city street,the vegetation has the effect of cooling and moisturizing on the test site,and the cooling and moisturizing effect of the composite vegetation cover surface is better than the single vegetation cover surface;the improvement of the effect of the vegetation underlay in the outdoor hot ring of the green space beside the city street is as follows: Jograss irrigation and irrigation.Grasses and shrubs and shrubs.Second,the hard site and the plastic site,during the test time,the effect of heating and dehumidification on the site,and the temperature of the two is slower than the plastic site,but the heat preservation time is long.Third,the water area is not absolutely cooling and humidifying for the site during the test period.In the range of 16:00-17:00 in the afternoon,some parts of the water are in a state of high air temperature and low relative humidity.Through the analysis of the individual landscape elements in the green space beside the street,and the combination of several landscape architecture elements,the impact of the overall microclimate of the green space beside the streets of the city.The operation mode of regulating microclimate in urban street green space is obtained through summing up summer landscape elements(vegetation,water body,hard site and plant combination).Based on this model,a landscape optimization design strategy for regulating the microclimate of urban roadside green space in summer is proposed.In terms of vegetation,priority should be given to the selection of composite vegetation.Shrub or tree and ground cover should be used in plant design,shrub and ground cover combination.When the water site is designed,the combination of the windward surface and the plant can better improve the microclimate comfort of the site.At the same time,when the water site is set up,it can be designed with the vine plants to create a more suitable outdoor activity place for human activities.