Microclimate Simulation And Improvement Strategy Of Xi’an Public Square

Today’s research on the microclimate of urban outdoor space is a hot topic.However,for outdoor spaces such as the public square,and many landscape factors have been used to study its microclimate environment improvement,how to integrate various landscape elements to improve the public square The microclimate environment remains to be studied.This research follows the idea of theoretical research—field testing—software simulation—reformation of examples.First,through the statistical analysis of the existing research on the square microclimate,the relevant theoretical concepts are defined and the research scope is delineated.Then,the civic squares built in Xi’an were statistically selected,and the most representative Changan square was selected as the main research object.From the perspective of microclimate,conduct basic surveys,questionnaires,behavior notes and field microclimate tests on Chang’an Square to obtain user’s subjective evaluation,behavioral activity characteristics and data of microclimate elements Changan Square is divided into several small spaces according to the landscape characteristics,and the quantitative contrast analysis of the micro-climate element data of similar landscape spaces is carried out,and the changes in time and space are summarized.The reliability of the simulation is verified by the simulation of the current situation of the square.In the part of example transformation,firstly,we summarize the reasons why people feel uncomfortable in the questionnaire.Then,according to the conclusion of theoretical and practical research,we know that plants are the most influential factor on the microclimate of square,and the degree of influence of plants is Arbor > shrub > grassland,followed by water body and pavement.According to this conclusion,for Chang’an square’s reconstruction,the single factor with great influence should be given priority,that is,to improve the microclimate of the square by determining the plant green amount,the form of plant enclosure arrangement,the plant arrangement and the water body arrangement design.First of all,the transformation of plant green amount is carried out,and the greening coverage rate is used for quantitative analysis.When the greening coverage rate is 45% and 50%respectively,the proportion of design grass and tree is 1:1,1:2 and 1:3,there are six parallelschemes.When the ratio of grass to tree is 1:3,the comfort of the square is the best.After determining the amount of plant green,the plant enclosure layout of the square was transformed.Considering its most significant impact on the microclimate stroke environment,three schemes were proposed,which are parallel to the dominant wind direction in summer,perpendicular to the dominant wind direction in winter and 45 degrees with the dominant wind direction throughout the year.Through simulation and comparison,it is determined that the scheme parallel to the dominant wind direction in summer is the most reasonable.According to the former simulation results in winter and summer part of the microclimate comfort is not ideal area,and then through the plant configuration means for the winter and summer design respectively,after the simulation comparison,a comprehensive scheme is proposed.In the former Winter and summer Microclimate Simulation results,through the arrangement of small-scale water body,the comfort area is not ideal.The final Chang’an square reconstruction scheme is obtained by superposition of all schemes.Envi-met was used to simulate the final plan,and the simulation map of various elements of the square’s microclimate was obtained.The comparison with the current situation confirmed that the square’s microclimate after transformation did improve,and the corresponding strategies were put forward according to the results of the improvement plan.