Study On Path Location Method Of Urban Ventilation Corridor Based On Multi-Source Data Fusion

For the past few years,urban climate change and environmental issues have become challenges for China’s new urbanization transformation strategy.The heat island effect and air pollution caused by disordered construction and unreasonable development of cities seriously affect the quality of life and health of residents.Urban ventilation corridor construction planning has become an important solution for urban construction to deal with climate change.As an important precedence link,the acquisition and positioning of ventilation corridor path is a key step in the organization of urban ventilation network,which requires the development and optimization of targeted technical methods.At present,under complex climate and environmental conditions,the applicability of common ventilation corridor path acquisition methods is challenged,and further exploration is needed in the aspects of starting and ending range of the path,direction judgment and organization.Therefore,the research and optimization of ventilation corridor path acquisition methods are helpful to improve theoretical construction and practical methods,and contribute to the healthy development of urban construction.Taking Xiamen as an example,this paper discusses the method of locating urban ventilation paths based on the multi-source data fusion,in order to obtain the regional corridor construction method urban complex conditions.Firstly,according to the literature review,the existing research methods for obtaining the air paths are summarized,with their applicability challenge and development direction.Secondly,the feasibility analysis of ventilation corridor construction is conducted and multi-source database is set up to provide data foundation for the next step.Thirdly,the stage of urban thermal environment analysis and recognition of function space is carried out.A data integration method of observing data of temperature and the land surface bright temperature is proposed to accurately evaluate the thermal pollution distribution and occurrence mechanism,technical steps such as thermal pollution zoning and the demarcation of suitable area for ventilation corridor construction have been supplemented.Fourthly,based on urban background wind environment analysis and available wind resource type screening,the distribution of effective wind resources in key periods is obtained by hourly slice analysis method in typical day,and the path direction of potential ventilation corridors is determined.Fifthly,on the premised of available wind resources in each district,the city is divided into different calculation units,and the distribution of surface windward roughness is analyzed according to the land uses and conditions.Then the potential air paths are found out with Least cost path method.Finally,this paper verifies the effectiveness and feasibility of this method,by comparing the results of which and common method,and summarize the advantages and disadvantages of the method.The research result shows that this problem-solving oriented research method locates ventilation paths based on multi-source data fusion,and is helpful to clarify the construction objective,grasp the wind environment operation rule and heat island distribution under complex climate and geographical conditions.It realizes the optimization of technical links such as fine function zoning,which provides a guiding significance for the accuracy improvement of the method of obtaining ventilation corridor paths.