To reveal the spatiotemporal characteristics of the dockless bike sharing connected to the metro and analyze the impact of built environment factors on connection demand, the built environment around the entrances and exits of Shenzhen metro stations was considered in this paper, a method for identifying connection travel was constructed by employing Thiessen polygons. This method explores the characteristics of four types of connection traffic on weekdays from both temporal and spatial perspectives, including access transfer (AT) of morning rush hour, egress transfer (ET) of morning rush hour, AT evening rush hours and ET of evening rush hours. The geographically and temporally weighted regression (GTWR) model was utilized to analyze the impact of four types of built environment factors on connection demand. The results indicate that the distribution of connection traffic exhibits spatial heterogeneity, with higher demand during the morning rush hour than during the evening rush hour. Business residential and scientific educational cultural service POIs have a positive impact on connection traffic in the urban core area, while it is negatively correlated in the suburban areas. However, the impact of transportation facility service POIs on connection traffic varies in the opposite direction. Corporate enterprise POIs have a positive impact on connection traffic in the western urban areas, while it is negatively correlated in the eastern areas.
图5为工作日早、晚高峰时段的共享单车接驳地铁出行客流量的空间分布特征,通过对比4类接驳客流量的分布特征发现,接驳客流量的分布具有空间异质性,呈局部聚集的特征,在宝安区的南部和龙华区的中部(图5(a)中红框区域)接驳需求较大。这是由于深圳城市核心区的高房价或房租迫使居民选择距离更远的地方居住,上述区域居民区较为密集,居民对于共享单车接驳地铁出行的需求高。此外,在早高峰时段,接驳客流的流动趋势由地铁5号线以北的城郊区域向地铁5号线以南的城市核心区流动(图5(b)中黄框区域),而晚高峰时段则呈相反趋势。此趋势的变化是由于城市核心区域的公共资源、商业资源、教育资源等优势明显,分布较多的科技创新园区、中央商务区(Central business district, CBD)、综合商业区以及学校等,如福田CBD、罗湖CBD、华强北商业区等。因此,在工作日早高峰时段,居民由于上班、上学等通勤活动导致接驳客流由城郊区域流向城市核心区域,而晚高峰时段则相反。
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