公交线网空间可达性优化研究

Study of Optimizing Transit Network Spatial Accessibility

在一定条件下,通过不同的线路布设方案可实现区域内公交线网的空间最佳可达性。为量化研究这一问题,首先,结合现有的可达性相关研究现状,提出了公交线网可达性的相关概念。在此基础上,建立了规划阶段公交线网空间可达性的优化模型,并设计了遗传算法对模型进行求解。最后,通过算例对模型及方法进行了验证。结果表明:该公交线网规划方法科学有效,能够提高整体公交线网的空间可达性,保证城市居民出行的实际需求,为公交线网的布局规划与调整提供方法和依据。

The spatial optimum accessibility of regional transit network can be realized through different route layout schemes under different conditions. To quantitatively research this problem,first,we defined the concept of transit network accessibility based on existing related studies of accessibility,and established an optimization model of transit network spatial accessibility in the planning stage. Then,we designed a genetic algorithm to solve the model. Finally,we gave a numerical example to verify the effectiveness of the model and the algorithm. The result shows that the transit network planning method is scientific and effective,it can improve the overall transit network spatial accessibility and ensure the travel demands of urban residents,which can provide a practical method and a basis for the planning and adjustment of the layout of transit network.