The Research On Micro-climate Of Street Blocks Based On Numerical Simulation

Urban climatic effect brings different kinds of special weather systems such as air pollution,storms,warm winter,etc.These special weather systems are adverse to social production and life,public health.It is of great significance to study the urban climatic effect,analyze the inherent formation mechanism,and put forward the measures and strategies to improve the climate effect,which contributes to the benign development of urban climate and the production and life of the residents.First of all,this paper summarized the spatial features of Shanghai street blocks using following aspects:the general layout of buildings,the height of buildings,the architectural forms,green space,water body,etc.According to these aspects,10 typical blocks are selected to establish the microclimatic model for numerical simulation using the numerical simulation software named Airpak.Next,through analyzing each block's spatial distribution of air temperature,wind speed,mean age of air,wind pressure,relative humidity,PMV index and other indicators provided by numerical results,we found that compared with the downwind area of a street block,the upwind area is with lower temperature,larger wind speed,smaller mean age of air,bigger air pressure between the front and the back of a building,and better climatic conditions.The air temperature is lower in the area near leeward side of buildings,green space and water body,and the closer to the green space and water body,the lower the air temperature.The relative humidity is greater in the area near windward side of buildings,green space and water body,and the closer to the green space and water body,the greater the relative humidity.The PMV index is smaller in the area near leeward side of buildings,green space and water body,so people have better thermal comfort here.Furthermore,on the basis of the previous text,from the perspective of building mode,green space and water body,this paper selected two or three blocks corresponding to each factor and set the measuring points in the characteristic area,used the wind speed,air temperature,relative humidity value of the measuring point to form the corresponding graph,and then analyzed the spatial distribution of the microclimate under the influence of different factors.Finally,we put forward corresponding street microclimate planning and design strategies from the angle of building mode,green space,water body,etc.