Construction Of Urban Ventilation Corridor Based On Ecological Safety

With the deepening of reform and opening up,the urbanization process has been accelerating,the population space has been continuously gathering,and the building density and building height have become more and more large.As a result,the internal ventilation quality of the city has become worse and worse,which has seriously affected the urban ecological environment and the physical and mental health of the residents.On the one hand,large-scale urban construction activities and dense internal buildings have drastically reduced the natural space,the green and ecological space has been artificially broken,the original ecological habitat has gradually disappeared,and the biodiversity has been severely damaged and the ecological function has been disturbed.Ecological efficiency is reduced.On the other hand,the heat generated during the use of industrial production and transportation in cities and other artificial activities covers the city,causing the heat island effect to be difficult to di gest.Contaminated air trapped inside cities further affects residents 'health.It is necessary to arrange the city ventilation corridor reasonably by promoting the benign circulation of the air inside and outside the city.The purpose of this paper is to improve the urban wind and heat environment.First,on the basis of the country's review of internal and external relevant studies,we have summed up the theory of ecological security and urban wind tunnels,and analyzed the main factors that affect ecological security,including ecological factors,biodiversity,and ecosystems,based on the clarification of ecological security and ventilation corridors.The main factors affecting the ventilation corridor are heat island effect and air pollution.Secondly,the relationship between ecological safety and urban ventilation corridor is analyzed,and the ecological space model is constructed from the relationship between ecological base and action space,the relationship between ecological plaque and compensation space,and the relationship between ecological corridor and ventilation corridor.Finally,the basic meteorological data such as prevailing wind direction,average wind speed,and temperature are used to analyze the basic conditions.Taking YiDe Road block in downtown Guangzhou as an example,PHOENIICS is used to simulate the potential wind passage and discuss how to connect with the main wind passage.From the angle of ecological safety,the development and protection strategy of the wind corridor is put forward,and the air pollution source in the action space should be controlled,and the pollution air concentration should be reduced from the source.Compensatory space is an important node of ventilation corridor and an important source area of clean and cold air.Compensatory space and surrounding areas need to maintain a certain degree of permeability and control the number of obstacles.The main function of the ventilation corridor is to provide low roughness channels for the flow of wind,and also to provide ways for urban and natural energy flow and material flow.