【摘要】 为推动城市公共绿地应急避险功能格局的优化,应用GIS的空间分析技术,对长沙市第五次人口普查数据进行了空间分布化,并通过人口密度分布与公共绿地缓冲区的叠加分析,对其人口服务辐射能力进行了探索研究。运用GIS与元胞自动机相结合的方法,构建2015年人口空间分布模型和交通流量综合预测系统模型,从城市均衡发展以及最大限度发挥城市公共绿地防灾避难功能的角度,对公共绿地合理的服务半径和空间布局进行研究。结果显示:(1)2005年长沙市市区内公共绿地缓冲区覆盖范围总计为113.54km2,约占长沙市市区总面积的20.5%,存在440.46km2的服务盲区;人口服务总数为49.59万人,辐射能力较弱。(2)考虑人口服务辐射能力和交通疏散能力两方面因素,从长沙城市发展和均衡的角度,结合城市交通规划,建议选择30处绿地作为应急避险绿地,组成放射形疏散主通道网。(3)依据源-汇-流思路,构建2015年长沙公共绿地的应急避难功能格局,使其公共绿地人口服务辐射能力达到60%以上。更多还原

【Abstract】 In order to promote the optimization of emergency refuge function pattern of the public green space system,this paper applies the function of spatial analysis of ArcGIS to deal with the fifth census data for Changsha,and on the basis of population density distribution and public green space buffer zone,the population service radiation capability of the urban public green space was studied.Combined with the GIS and CA,this subject established the spatial distribution model of population and the traffic flow prediction model for the year 2015.From the perspective of balanced development of cities and maximization of disaster prevention functions of urban public green space,the reasonable service radius and distribution of public green space were identified.The result shows:(1)the buffer zone of public green space is 113.54km2 in the urban range of Changsha in 2005,covering 20.5% of the total urban area,but the uncovered service space is 440.46km2,and the total service population is 495.9 thousands,the population service radiation capability is weak;(2)considering the factors of population service radiation capability and traffic evacuation capacity,from the perspective of the balanced development of the city,combined with the urban traffic planning,the paper suggests to select 30 green spaces as disaster-proof to compose the radial road network for evacuation;(3)establishment of emergency refuge function pattern according to thinking above is hopeful for increasing the population service radiation capability to more than 60% in Changsha in 2015.更多还原