长沙城市空间结构演变的动态模拟

Dynamic Simulation of Evolution of Urban Spatial Structure of Changsha City

以1990—2015年城镇建成区、交通路网、城镇人口密度的数据为基础,以长沙市为例展开动态模拟研究:利用六边形格网系统描述城市建设指数的空间分布,利用十二向玫瑰图坐标系表现各增长单元对周边的辐射作用,利用四维山丘图模拟过去25年的城市空间结构演变脉络,预测未来10年的发展趋势。通过数理分析和动态观察,得出了长沙城市空间结构演变在宏观、微观层面的若干结论。试图提出优化模式,并为城市总体规划的前期研究提供方法层面的参考。

The evolution of urban spatial structure which represented the endogenous mechanism of urban expansion and development is a dynamic, changing process. Based on the data of urban built-up area, traffic network and urban population density, this study carried out-a dynamic simulation by taking Changsha as an example. To use the hexagon grid system described the spatial distribution of urban construction index. Expressing the radiation effects on the surrounding of the growth units by coordinate system of the 12 directions rose diagram. Using the four-dimension hill diagram to simulate the evolution vein of urban spatial structure in past 25 years, and predict the development trend in the next 10 years. Through the mathematical analysis and dynamic observation, the study acquired some conclusions about the evolution characteristics in macro and micro level of urban spatial structure of Changsha. This study tried to propose the optimized model, and provide the methodology reference for the preliminary study of the urban overall planning.