基于用地开发强度决策支持系统的大尺度城市空间形态优化控制

Optimization & control of large-scale urban spatial form based on decision support system for land development intensity

以常州老城为例,介绍了基于用地属性相似关系所研制的2.0版用地开发强度决策支持系统,该系统通过引入体现随机性的相似关系算法,得到各用地开发强度的合理波动区间,该结果基本符合规划决策经验和实际情况,体现了容纳现实偶然性的决策理性.通过振幅调节、参照地块次数、差异度控制和开发强度总值等参数设定,规划设计人员可有效控制系统运行过程和结果,体现城市设计意图,适应不同城市特定情况.在此基础上,结合不同开发强度和用地性质的典型街区模式菜单,尝试建立了一套运用该系统进行大尺度城市空间形态优化控制的技术路线和方法,对于解决我国当前城市发展无序的问题具有重要的现实价值.

The paper introduced the updated decision support system for land development intensity（version 2.0） based on the similarity relationship between land attributes with the case of Changzhou old area as the example. Under the improved algorithm each block selects its reference blocks randomly in its similar blocks and the selection probability is just the similarity coefficient between them, which leads to the rational fluctuate interval of each pending block＇s development intensity. The outcome follows the planningdecision experience and the practical situation, which embodied the decision rationality which also accepts the realistic chances. The planners and designers may control the system with their urban design intensions by adjusting the parameters such as the swing of vibrancy, reference times, difference value, sum of development intensity, and so on. Based on this system and a menu of typical urban block patterns under different development intensities and land functions, the optimized procedure and method of large-scale urban spatial form is proposed, which has the realistic value for solving the problem of out-of-order development in Chinese cities.