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在分析港口城市陆路集疏运系统结构及因果反馈关系基础上,采用系统动力学方法,将该系统分为经济、运输网络及交通投资3个子系统,并建立SD仿真模型.以天津市为实例进行模拟,分析不同陆路集疏运方式投资比例对港口城市陆路集疏运能力的影响.结果表明,单纯增加交通基础设施投资对于港口及港口城市经济发展带动效益不明显,需要考虑港城陆路集疏运系统的实际发展.
Based on the analysis of the structure of port transit and distribution system in port cities and the causal feedback, the system is divided into three subsystems of economy, transportation network and transportation investment by using the method of system dynamics, and the SD simulation model is established. Taking Tianjin as an example The results show that simply increasing investment in transportation infrastructure will not bring obvious benefits to the economic development of port and port cities, so it is necessary to consider the land-use sets of Land City Set The actual development of the system.