Research On The Vitality Simulation Of Outdoor Public Sapce In Residential Areas Based On Agent Based Modeling

In the era of rapid urbanization,the design and construction of newly-built residential areas often lead to many problems in public space,because of the neglect of "people-oriented".At the same time,the rapid social and economic development has made great changes in the life and activities of residents in residential areas.Therefore,the activities in the public space of the residential area are decreasing,and the community has lost its vitality.At present,the traditional research on space vitality is mainly through the top-down method.According to the field survey or big data statistics,the spatial vitality is modeled,quantified and evaluated,and the corresponding vitality optimization strategy is proposed.Compared with traditional modeling methods,the agent-based modeling method(ABM)used in this study is distinguished by the fact that it starts from the behavior of individuals and studies the characteristics of spatial vitality from bottom to top,simulates the activities of residents in outdoor public space of residential area through computer simulation,so as to show the dynamic,intuitive and visual space vitality,which is helpful to put forward new methods and ideas for the future research of space vitality.Based on the behavior of people,the main body of outdoor public space in residential area,this paper sums up the process of forming the vitality of public space,and determines that the research on the vitality of outdoor public space in residential area is composed of external representation and internal mechanism.Among them,the research on the external representation of spatial vitality summarizes the relationship between the spatiotemporal behavior of residents in outdoor public space and the elements of space material environment;the study on the internal mechanism of spatial vitality determines how the spatiotemporal behavior of residents’ activities affects the spatial vitality in the four dimensions of space,crowd,activity and time.This paper selects four newly-built residential areas in Ningbo City as the sample,and obtains the relevant data of the spatial-temporal behavior of four types of outdoor activities in outdoor public space,including children,teenagers,middle-aged people and the elderly.Correlation analysis and spatial potential model were used to calculate and summarize the relationship between outdoor activities and physical environment of public space.In addition,linear function normalization method and coefficient of variation method were used to quantitatively analyze the influencing factors of spatial vitality under the four dimensions,and the calculation methods of spatial vitality was obtained.According to the relevant models and methods obtained from the above research,the modeling method based on agent is used to determine the simulation process of ABM model and the relevant rules and parameters required for simulation.Choose Netlogo software as the simulation platform to build the simulation environment of the ABM model,compile the model simulation process,the main rule parameters of residents’ activities and the calculation method of spatial vitality into a computer language through the unique Logo language,and carry out the simulation results of the model and the actual survey results.After checking and applicability verification,an ABM model that is finally suitable for simulating the vitality of outdoor public spaces in new residential areas in Ningbo City is obtained.Based on the simulation results of the ABM model,a targeted strategy for the vitality optimization of outdoor public spaces in residential areas is proposed from the three perspectives of space layout,environmental facilities,and use functions.