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地理学报  2011 

城市形态、交通能耗和环境影响集成的多智能体模型

DOI: 10.11821/xb201108003, PP. 1033-1044

Keywords: 土地使用,开发强度,交通能耗,环境影响,多智能体,蒙特卡洛

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Abstract:

城市能耗占全球能耗的比重随着城市化率的不断提高而增大,交通能耗作为城市能耗的重要构成部分,已有较多研究证明城市形态对其具有显著影响,这些研究多属于城市间层次,而少有城市内的研究对城市形态与交通能耗、环境影响的关系进行定量识别。本文拟建立城市形态、交通能耗和环境的集成模型,对单一城市内的不同空间组织(即城市形态),如土地使用方式、开发密度、就业中心的数量和分布等,对潜在的通勤交通能耗和环境影响的关系进行定量识别。该模型采用多智能体(multi-agent)方法,一方面针对同一假想空间采用蒙特卡洛方法根据约束条件生成多个城市形态,并采用就业地斑块数目、平均斑块分形指数、香农多样性和平均近邻距离等14个指标表征城市形态。另一方面,固定数量的居民agent在所生成的每个城市形态内,选择居住区位和就业区位,根据通勤距离和社会经济特征选择交通方式,进而计算通勤交通能耗和环境影响,在城市层面统计通勤交通能耗和环境影响总和。最后分析城市形态与通勤交通能耗和环境影响的定量关系,主要得到以下结论,①对于不同的城市空间布局和密度分布,通勤交通能耗的弹性范围约为3倍;②城市形态评价指数中,就业中心斑块的数量是对通勤交通能耗影响最大的变量;③多种城市形态所对应的通勤交通能耗基本呈正态分布。此外,还对城市形状对通勤交通能耗的影响进行了识别,并针对假想空间的多个典型城市形态(如紧凑与分散、单中心与多中心、TOD政策、绿隔政策),进行了通勤交通总量的计算,进而对典型规划理念进行了定量对比。本模型不仅可以用于识别城市形态与通勤交通能耗和环境影响的定量关系,定量对比典型的规划理念,还可以用于空间规划方案的能耗和环境影响评价。

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