Study On Wind Environment Optimization Of Riverside Block In Shenyang

At present,the COVID-19 pandemic has highlighted the drawbacks of urban density.The density of the city leads to poor ventilation in the city,which increases the risk of outdoor virus infection on the one hand.On the other hand,it also worsens the urban climate and reduces outdoor comfort.As the core of urban microclimate,wind environment plays an important role in reducing epidemic spread,alleviating heat island phenomenon,solving urban pollution and improving outdoor comfort.The water land wind formed near the water body can obviously improve the wind environment of riverside blocks.Shenyang is located in the cold region,on the one hand,the heat island effect is obvious in summer,on the other hand,the urban riverfront wind environment is relatively bad in winter.Therefore,it is of great significance to study the wind environment of riverside blocks in Shenyang city for improving the wind environment of riverside blocks in cold regions.This thesis takes The riverside block of Shenyang city as the research object,discusses the relationship between the characteristics of riverside block inside the city,the river and the nearby wind environment in the cold region,so as to study the characteristics of the wind environment of riverside block in the cold region.The main research contents of this thesis are as follows:Firstly,a questionnaire was constructed based on the study of human thermal comfort,and a field survey was conducted on the subjective feelings of outdoor pedestrian wind environment in riverside blocks of Shenyang in typical months in winter and summer.The current subjective wind environment status of Shenyang was obtained,and the evaluation criteria of urban wind environment constructed by predecessors were combined.The wind environment evaluation standard of riverside blocks in Shenyang was established based on four indexes: average wind speed,wind speed dispersion,quiet wind area ratio and wind speed decay rate.Secondly,Phoenics software was used to simulate the overall wind environment of riverside blocks in Shenyang.Based on the layout of buildings and road network,the wind environment of riverside blocks was divided into units,and the wind environment of unit level was obtained.The relationship between the wind environment of riverside blocks and the characteristics of blocks was obtained by SPSS regression analysis.On the whole,the wind environmental performance of riverside blocks is poor,which is limited by the building layout and building density.Through correlation analysis,it can be concluded that the average wind speed at pedestrian height(1.5m)is negatively correlated with building density,positively correlated with water body green plant coverage,and has no significant relationship with floor area ratio.Finally,the influence of architectural characteristics on wind environment is explored from the aspects of building layout,building height and building orientation,and further the optimization measures of wind environment of urban riverside blocks in cold regions are obtained.The construction of urban riverside blocks in cold regions should ensure that the building density is <0.30,the coverage rate of water green plants is >0.30,the floor area ratio is <5 for high-rise residential buildings and <3 for multi-storey residents,so as to obtain a good urban wind environment.The research results of this thesis can play a positive role in improving the wind environment of urban riverside blocks in cold regions.