Parkland Layout Evaluation Model Reasearch Based On Big Data And Urban Complexity Theory

With rapid development of China's urbanization,accompanied by a serious shortage of land resources and environmental capacity,and the city's ecological env ironment has been unprecedentedly challenged.Parkland is an important part of the urban ecological environment.It is an open space for residents to play and relax.It is also an important factor to regulate and improve the urban microclimate.The scientific and rational layout of the parkland can maximize the efficiency and improve the urban microclimate around the parkland.Therefore,on the basis of indicators such as quantity and area,it is still necessary to establish a scientific layout evaluation model to achieve effective parkland layout optimization.This paper proposes an evaluation model that can be used to quantify the layout of urban parkland.The model considers the behavior of residents to choose and travel in the park among the evaluation factors.Residents and parks are no longer static quantity matching relationships,but interaction and choice.The layout of the parkland is affected by the layout of the surrounding residential area.The density of the parkland should be roughly proportional to the density of the surrounding residential area.On the other hand,it is also affected by the quality of its own park.The higher quality park can attract more residents.Therefore,the relationship between parkland and residents is not static in itself,but a dynamic and interactive selection process.Urban elements such as residents,parkland,residential areas,and road networks are intertwined to form a dynamic and complex urban environmental system.The study of park green space requires a clear understanding of the entire system to ens ure scientific res earch.In view of the complex relationship of the above cities,this paper analyzes the relevant factors that need to be considered in the layout research.In addition to the area and reachability distance,it also includes the distribution characteristics of residents and the attraction of the park.Through the relevant basic data and theory,each factor is transformed into the model basic data and model parameters,and the urban complexity theory is introduced.The core algorithm such as multi-agent system and power law distribution is used to connect all the basic data and model parameters in series to complete the model.Finally,using the Nanjing old town as a case to verify the model,and using the actual thermal values of the park,the simulation results were compared and analyzed.Through the application of actual cases,the following basic conclusions can be obtained:1)The model can effectively evaluate the layout of the parkland as a whole;2)Compared with the number and area of parkland,the use efficiency is a better evaluation park.Indicators of parkland;3)The distribution characteristics of residents in cities are important factors affecting the layout of park green space;4)The quality of parks has a greater impact on the attraction of surrounding residents.The determination of park quality requires multiple considerations.